P70
Mobile Directional Control Valve
Proportional, Open or Closed Centre
2
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Catalogue layout
This catalogue is designed to give an overview of the P70
directional valve and to show how it can be customised to meet
your needs exactly. Apart from general information and basic
technical data therefore, the catalogue contains descriptions of
the variety of options available for the different function areas
of the valve. After you have studied the options and made your
selection, we will tailor your valve to meet your opera ting and
control criteria.
Each function area is given as a subheading, followed by
a brief description. When several optional functions are avail-
able for the same function area, the subheading is followed by
an “Item number” in square brackets, e.g. Main pressure relief
valve [16]. This is followed by a series of coded options, e.g. PS,
PB, Y, together with a brief description of what each code repre-
sents. Alternatively, one or more pressure, flow or voltage options
are given.
On pages 12 and 13 there are general circuit diagrams
showing the basic functions of the P70 valve, together with the
item numbers and letter codes used to represent them. Natu-
rally, the same item numbers and letter codes are used in all
sub-circuit diagrams that appear elsewhere in the catalogue in
conjunction with descriptions of the respective function areas. All
sub-circuit diagrams have been extracted from the general circuit
diagram. Please note that, unless otherwise stated, all sections
and views of the valves have been drawn as seen from the inlet
section.
How to order your valve
Parker has developed a computer program to specify the P70,
so that the configuration of your valve can be optimised to give
maximum performance in your particular hydrau lic system.
Based on the demands on each individual machine func-
tion, the computer specifies the configuration of the valve to give
optimal performance. It also generates complete documentation
for your valve in the form of a detailed specification and hydraulic
circuit diagram.
The program also generates a unique product designation that
is subsequently stamped into the data plate on your valve. Your
Conversion factors
1 kg = 2.2046 lb
1 N = 0.22481 lbf
1 bar = 14.504 psi
1 l = 0.21997 UK gallon
1 l = 0.26417 US gallon
1 cm
3
= 0.061024 in
3
1 m = 3.2808 feet
1 mm = 0.03937 in
9/5 °C + 32 = °F
Catalogue Information
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS DESCRIBED HEREIN OR RELATED ITEMS
CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY DAMAGE.
This document and other information from Parker-Hannifin Corporation, its subsidiaries and authorized distributors provide
product or system options for further investigation by users having technical expertise.
The user, through its own analysis and testing, is solely responsible for making the final selection of the system and components
and assuring that all performance, endurance, maintenance, safety and warning requirements of the application are met. The
user must analyze all aspects of the application, follow applicable industry standards, and follow the information concerning
the product in the current product catalog and in any other materials provided from Parker or its subsidiaries or authorized
distributors.
To the extent that Parker or its subsidiaries or authorized distributors provide component or system options based upon data or
specifications provided by the user, the user is responsible for determining that such data and specifications are suitable and
sufficient for all applications and reasonably foreseeable uses of the components or systems.
Offer of Sale
Please contact your Parker representation for a detailed ”Offer of Sale”.
WARNING – USER RESPONSIBILITY
customised valve specifications remain on our database to facili-
tate rapid identification of your valve in the event of re-ordering or
servicing.
Early consultation with Parker saves
time and money
Our experienced application engineers have in-depth knowledge
of the different types of hydraulic system and the ways in which
they work. They are at your disposal to offer qualified advice on
the various combinations of functions and control characteristics
you may require, and to advise how to obtain the best possible
economy.
By consulting Parker early in the project planning stage, you are
assured of a comprehensive hydraulic system that will give your
machine the best possible operating and control characteristics,
together with outstanding economy.
Subject to alteration without prior notice. The graphs and
diagrams in this catalogue are typical examples only. While the
contents of the catalogue are updated continually, the validity
of the information given should always be confirmed. For more
detailed information, please contact Parker Hannifin.
3
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Contents
List of contents Page
General Information ........................................................................................................4
(Valve with open centre, P70CF), (Valve with open centre, P70CF) ..............................5
Control characteristics ....................................................................................................5
Constant-pressure systems, CP, CPU, CPU, (Valve with closed centre, P70CP) ..........6
Control characteristics ....................................................................................................6
Load sensing systems, LS, (Valve with load sensing, P70LS) .......................................7
Operating characteristics ................................................................................................7
System connection .........................................................................................................8
A. Power beyond connection, multi-valve system, P70CF only ................................8
B. Power beyond connection, single-valve system, P70CF only ..............................8
C. Parallel connection, multi-valve system ................................................................9
Technical Data ..............................................................................................................10
Environmental characteristics .......................................................................................11
Hydraulic circuit diagram showing basic functions, standard valve ..............................12
Hydraulic circuit diagram showing basic functions (actuators with closed spool end) ..13
Inlet Section ..................................................................................................................14
Type of inlet section [15] .........................................................................................14
Main pressure relief valve [16] ................................................................................17
Pressure setting [17] ...............................................................................................17
Pump unloading [22] ...............................................................................................17
External pump unloading or multi-level main pressure relief function ....................18
Tank connection T2 [25] ..........................................................................................18
Pump connection P1 [26] .......................................................................................18
Pump connection P2 [27] .......................................................................................18
Mid-inlet section [90] .....................................................................................................19
Options, mid-inlet [93] .............................................................................................20
Main pressure relief valve [94] ................................................................................20
Pressure setting [98] ...............................................................................................20
End Section ..................................................................................................................21
Type of end section [30] ..........................................................................................21
Tank connection T1 [33] ..........................................................................................21
Tank connection T3 [34] ..........................................................................................21
Series-connection function [36] ..............................................................................21
Reducing valve [37] ................................................................................................22
Pilot-oil strainer [39] ................................................................................................22
Separate tank connection for pilot circuit [40] .........................................................22
Spool Sections ..............................................................................................................23
Type of spool section [47] .......................................................................................23
Lever bracket [51] ...................................................................................................24
Spool actuators [50] ................................................................................................25
Hand-operated spool actuators with open spool end .......................................25
Remote controlled ON/OFF spool actuators with open spool end ...................25
Remote controlled proportional spool actuators with closed spool end ..... 26-28
Solenoid variant [59] .........................................................................................27
Connector Type [56] .................................................................................... 27-28
Spool position indicator [52] .............................................................................29
Spool function [60] ..................................................................................................30
Spool designation [69] ............................................................................................30
Pressure gallery [66] ..............................................................................................30
Choice of Spool ......................................................................................................30
Pressure limiters in work ports [76A/B](Port relief valves) ......................................31
Port relief valve [76] ................................................................................................31
Function blocks (manifolds) ..........................................................................................32
Connectors, electrical ...................................................................................................32
Hand levers for open and closed spool-actuators ........................................................33
Dimensional drawings, standard valve .........................................................................34
Dimensional drawings, model with closed spool end ...................................................35
Dimensional drawings, spool actuators .................................................................. 36-38
[00] refers to item numbers in customer specification.
4
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
The P70 directional valve is of modular
construction. It is designed for many
different applications and used extensively
in machines such as lorry cranes, mini-
excavators, small wheeled loaders and
concrete placing cranes. The P70 is avail-
able in three different versions: the P70CF
with an open centre for fixed pumps, the
P70CP with a closed centre for variable
displacement pumps and the P70LS
with a closed centre, coupled with a load
sensing signal, to the variable displace-
ment pump.
Compact system construction
The P70 offers unique possibilities for the
integra tion of application-adapted func-
tions to give compact and total system
solutions for a wide range of mobile
machines .
Freedom in machine design
In order to give the system designer a
greater level of flexibility and freedom,
the valve is designed to be either directly
operated, or controlled by electric, pneu-
matic or hydraulic remote controls. A
combination of these direct, and remote
controls, can be utilised allowing a greater
degree of component location and pilot
media options.
Economy
Thanks to its modular construction, the
P70 can be optimised for both simple
and complex functions. The possibility of
integrating total function solutions gives
low overall system costs. The valve can be
modified or expanded as necessary to suit
the needs of the customer.
Safety
The valve is of robust construction, with
each function unitised. This facilitates both
training and servicing and contributes
greatly to safety. Moreover, the valve can
be fitted with a special inlet section that
enables an emergency STOP function to
be incorporated into the valve to meet the
demands of the EC Machinery Directive in
a uniquely simple way.
Design
The P70 is a stackable valve system and
can be supplied in combinations of 1 to
10 spool sections, additionally manifold
sections can also be utilised to add further
system flexibility. The valve is designed for
system pressures of up to 320 bar.
The maximum recommended flow
rates for the P70CF, CP and LS are 70, 90
and 90 l/min respectively, depending on
how the valve is equipped. There are also
a wide range of different available spools,
enabling specific control characteristics to
be optimised.
Benefits
• Low fuel consumption and heat genera-
tion with low pressure drops.
• Productivity - our complete application
adapted spool range will optimise each
machine function to provide unsur-
passed driver control and productivity.
• Precision - excellent repeatability espe-
cially during simultaneous operation
by having machined land edges in the
valve housing.
• Long service life – e.g. open spool
ends with rubber bellows increase
the service life of both spools and
spool seals. Quality materials and
high manufacturing precision ensure
a superior product
• Smooth machine feel with less driver
fatigue with low lever forces.
• Integrated functions – by combining
P70 and flanged on manifolds addi-
tional functionality is effectively
provided in the minimum space enve-
lope and at the same time with reduced
hosing complexity and cost.
• Flexibility – options allow for connec-
tion of more than one pump or valve
in a system to increase the range of
applications P70 can be used on.
• Security - P70 prevents undesirable
load sinking during simultaneous
operation with separate check valves
positioned in each spool section.
• Safety - P70 gives an individual
maximum pressure limitation with
separate port relief valves positioned in
each work port.
• Minimized downtime with simple
design, which makes P70 easy to
service. An emphasis on simplicity
of design makes the P70 the best in
class.
General Information
5
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Principle circuit diagram for valve with open centre
Open centre systems, OC
(Valve with open centre, P70CF)
The pump in a constant-flow system has fixed displacement,
which means that the flow remains constant for a given engine
speed. The pressure, however, changes to meet demand.
Any oil that is not directed out to a consumer flows back to
tank via the free-flow gallery (open centre) in the valve. When
several lifting functions are activated simultaneously, the pres-
sure is determined by the heaviest load. Simultaneously oper-
ated functions should therefore have roughly the same pressure
needs, or be divided into separate pump circuits to minimise
cross-functional interference and give good operating economy.
Provided that most of the pump capacity is used, the OC system
is very economical. For this reason, it is important for the system
to have a pump of the right capacity.
Control characteristics
In hand-operated valves, there is no clear-cut relationship
between the stroke of the lever and the speed of the load. The
speed of the load will depend on the following four variables: its
weight, the pump flow, the direction of force and the direction
of movement of any other simultaneously operated loads. The
reason for this is that, when more passages are opened subse-
quently, the flows redistribute themselves so that the pressure
drop in all flow paths becomes equal.
The P70CF’s customised valve spools give considerably
better simultaneous-operating characteristics. In some cases, this
can result in higher energy losses during the fine-metering stage.
Our directional valves, which are designed to be remote
controlled, are usually fitted with pressure compensated spools.
This means that the regulated flow remains constant for a given
lever stroke, regardless of any pressure variations within the
system.
q(l/min) Flow rate in work port
P2B
P1
UL
T2B
B
A
PF PS
T4
T1
T3B
TP
Lever stroke in %
In P70CF valves with hand-operated spools, speed is affected by
the weight of the load, i.e. the heavier the lift load, the longer the
lever stroke needed before the load starts to move. Conversely,
the heavier the load to be lowered, the faster the lowering
sequence.
q(l/min) Flow rate in work port
Lever stroke in %
In the P70CF equipped with FPC, PC, ECS and ECH closed
spool-actuators, the spools are pressure compensated, with the
result that the load’s influence on speed is negligible.
20 40 60 80 100
0
40
60
80
20
0
50 bar lift
150 bar
250 bar
250 bar lower
150 bar
50 bar
q pump
20 40 60 80 100
0
40
60
80
20
0
250 bar lower
50 bar
50 bar lift
250 bar
q pump
System description
6
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
P2
P1
UL
T2B
B
A
PF
PS
T4
T1
T3B
TPB
q(l/min) Flow rate in work port
20 40 60 80 100
0
40
60
80
20
0
Lever stroke in %
In the P70CP with hand-operated spools, all loads start moving
at the same point, regardless of the size and direction of the load.
The size of the load does, however, affect the slope of the curve
to some extent.
50 bar lift
150 bar
150 bar lower
100 bar
50 bar
Principle circuit diagram for valve with closed centre
Constant-pressure systems, CP, CPU
(Valve with closed centre, P70CP)
Constant pressure systems are supplied by a variable displace-
ment pump. This type of pump is controlled by a regulator which
ensures that the pressure is kept constant whilst the flow varies
to suit the demand. The constant-pressure system is of relatively
simple construction, with an uncomplicated valve. However, the
variable pump is more advanced than pumps with fixed displace-
ment.
To maintain the constant-pressure system’s superior control
characteristics, the pump must be dimensioned to give the sum of
the maximum flows for simultaneously operated functions. If the
pressure cannot be maintained, the valve loses its control charac-
teristics quickly and the actuated functions start to influence each
other, with the lightest loads receiving the most oil. However, this
system is less susceptible to pressure drops, as the pressure
corresponding to the machine capacity is always available.
There are two main types of pump on the market. What distin-
guishes them from each other is where the signal that influences
the pump regulator comes from. One pump type takes the signal
internally, whereas the other requires a signal from the directional
valve. The P70CP can be used equally efficiently with either type.
Control characteristics
A correctly specified P70CP gives excellent control characteris-
tics, with different functions having no affect upon each other. The
system also has great anti cavitation characteristics which allow a
lowering movement to change to a lifting one without delay.
The maximum speed of each P70CP function is determined
by the design of the spool and the pressure demands of the
load. The P70CP can be fitted with a range of Parker’s specifi-
cally designed spools, allowing them to be exactly suited to the
customers speed and function requirements. In the P70CP too,
remote controlled spools are pressure compensated. However,
if the flow requirements of the system exceed the maximum
capacity of the pump, the pressure level cannot be maintained
and the normally very good control characteristics deteriorate.
System description
Lever stroke in %
In the P70CP equipped with FPC, PC, ECS and ECH closed
spool-actuators, the spools are pressure compensated, with the
result that the load’s influence on speed is negligible.
20 40 60 80 100
0
40
60
80
20
0
q(l/min) Flow rate in work port
250 bar lower
50 bar
lift
q pump
7
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
System description
Principle circuit diagram for valve with load sensing
Load sensing systems, LS
(Valve with load sensing, P70LS)
In the load sensing system both pressure and flow are modulated
to match immediate needs from the consumers, with a pressure
level corresponding to the heaviest load at that moment.
When supplied from a variable displacement pump the
directional control valve sends a load signal to the pump control
regulator, which adjusts the pump output to maintain a constant
pressure difference between the pump output and the load
signal.
In the P70LS, the free flow gallery is used to collect the load
pressures from all the motor ports of the valve. The signal of the
highest load is then delivered to the variable pump regulator.
In order to achieve good operating characteristics, the pump
should be sized to deliver flow equal to the sum of all simultane-
ously working functions. If the control pressure difference cannot
be maintained, the operating characteristics of the valve can
quickly deteriorate, and the controlled functions will influence
each other, progressively resulting in lower loads receiving more
flow than the higher ones.
In common with a constant flow system, simultaneously
working functions should have approximately the same pressure
requirement or they should be divided into separate circuits for
high operating efficiency.
Operating characteristics
With a correctly adjusted P70LS valve, the operating charac-
teristics of the system are very good. The constant differential
pressure maintained by the pump means that the flow to the
heaviest load in a load sensing system is always pressure
compensated.
However, load sensing does not mean that other functions
are pressure compensated. To achieve good operating character-
istics, the spools should be adapted for each function.
P70LS valves are designed for remote control and have
pressure-compensated spools. This means that the regulated
flow remains constant at a certain lever position, regardless of
pressure variations in the system.
q(l/min) Flow rate in work port
Lever stroke in %
In the P70LS equipped with PC, ECS and ECH closed spool-
actuators, the spools are pressure compensated, with the result
that the load’s influence on speed is negligible.
P2
P1
UL
T2B
B
A
PF PS
T4
T3
TPB
20 40 60 80 100
0
40
60
80
20
0
250 bar lower
50 bar
lift
q pump
8
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Below are a few examples of how the P70 can be connected up.
If an additional pump is connected to valve 2, then valve 2
re
ceives the flow from pump 2 plus any residual flow from valve 1.
B. Power beyond connection, single-valve system,
P70CF only
The pump is connected to the inlet section. Flow that is not
directed out to consumers connected before the mid-inlet section
continues to consumers connected after the mid-inlet section.
This means that the first spool sections have priority, i.e. in the
event of full spool actuation in a section before the mid-inlet
section, no flow continues to the sections after the mid-inlet
section.
If an additional pump is connected to the mid-inlet section, then
subsequent sections will receive the flow from pump 2 plus any
flow from pump 1 that has not been used by the sections before
the mid-inlet section.
A. Power beyond connection, multi-valve system,
P70CF only
The pump is connected to the first valve. Flow that is not directed
to a consumer via the first valve continues to the next valve. The
first valve therefore has priority, i.e. in the event of full spool actu-
ation in the first valve, no flow continues to the next valve.
Inlet section Spool section End section
S-function*
S-function*
Mid-inlet section
Mid-inlet section
System connection
= Alternative connection
= Signal line
* The different functions are described in more detail on
pages 14 - 21.
9
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
C. Parallel connection, multi-valve system
In parallel connection, the same pump is connected to two
or more valves. The function is the same as if the pump were
connected to a single large valve.
Parallel connection, fixed pump (OC), P70CF
S-function*
L-function*
L-function [27]
ST-nipple [33]
CUI- or L-function.
L-function [27]
L-function [27]
Parallel connection, variable pump (CP), P70CP
Parallel connection, variable pump (CPU, LS), P70CP, P70LS
= Alternative connection
= Signal line
* The different functions are described in more detail on
pages 14 -21.
System connection
10
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Pressures
Pump connection max. 320 bar* (4640 psi)
Work ports max. 350 bar* (5075 psi)
Tank connection, static max. 20 bar (290 psi)
Flow rates (recommended)
P70CF. Pump connection max. 70 l/min (18.5 USgpm)**
P70CP. Pump connection max. 90 l/min (23.8 USgpm)**
P70LS. Pump connection max. 90 l/min (23.8 USgpm)**
P70CF. Return fr. work port max. 100 l/min (26.5 USgpm)**
P70CP. Return fr. work port max. 125 l/min (33.0 USgpm)**
P70LS. Return fr. work port max. 125 l/min (33.0 USgpm)**
Internal pilot pressure
Fixed setting 35 bar (508 psi)
Leakage from work port over spool
From A or B port: max. 75 cm
3
/min (4.58 cu.in/min) at 250 bar
(3625 psi), oil temperature 50 °C (122 °F) and viscosity
30 mm
2
/s (cSt).
Weight
Since the weight will vary somewhat depending on the configura-
tion of the valve, the values below are approximate.
Valve housing inclusive of spool, pressure relief valve etc.
and inclusive of spool actuator.
Standard inlet section 2.7 kg (6.0 lb)
Inlet with bypass 4.9 kg (10.8 lb)
Single spool section C 3.5 kg (7.7 lb)
Double spool section C 7.2 kg (15.9 lb)
Single spool section ECH 4.1 kg (9.0 lb)
Double spool section ECH 8.4 kg (18.5 lb)
Mid-inlet section 2.7 kg (6.0 lb)
End section with pilot
pressure supply 3.8 kg (8.4 lb)
End section 2.7 kg (6.0 lb)
Connections
Unless stated otherwise, all standard connections are available
in two versions: G-version (BSP pipe thread) for flat seal (type
Tredo) as per ISO 228/1 and UNF-version for O-ring seal as per
ISO 11926-1.
Connection Location G-version UNF-version
P1, P2 Inlet section G1/2 7/8-14 UNF-2B
PX Inlet section, IU G1/4 9/16-18 UNF-2B
T2 Inlet section, I G1/2 7/8-14 UNF-2B
T2 Inlet section, IU G3/4 1-1/16-12 UN-2B
UL Inlet section G1/4 9/16-18 UNF-2B
P, EF Inlet section, PRI G3/4 —
X Inlet section, PRI G1/4 —
M1, M2, M3 Mid-inlet G1/2 7/8-14 UNF-2B
Work ports
A and B Spool section G1/2 7/8-14 UNF-2B
PC Spool section G1/4 9/16-18 UNF-2B
T1, T3 End section G1/2 7/8-14 UNF-2B
T4 End section G1/4 9/16-18 UNF-2B
TP End section G1/4 9/16-18 UNF-2B
PS End section G1/4 9/16-18 UNF-2B
PF End section G1/4 9/16-18 UNF-2B
male connector
Surface treatment (painted) [07]
The paint is only a primer. For full corrosion protection, the valve
must be painted with an outer coat.
X Unpainted
P Primed valve, black. Primer only
* Stated pressures are maximum absolute shock pressures at
10-bar tank pressure. See page 16.
** Max. recommended flow rate dependent on choice of spool.
Main pressure
relief valve [16]
Main pressure relief
valve in mid-inlet
section [94]
Pump connec-
tion P1 [26]
Pump connec-
tion P2 [27]
Connections in
mid-inlet section,
M1, M2, M3 [90]
Tank connec-
tion T2 [25]
Tank connec-
tion T1 [33]
Work port A,
section 1
Work port B,
section 2
Spool actuator C [50]
Connection for hydraulic
remote control, PC [50]. Ac-
tuation pump to work port B
Connection for hydraulic
remote control, PC [50].
Actuation pump to work
port A
Inlet section
Mid-inlet section
End section
Tank connec-
tion T3 [34]
Technical Data
Spool actuator ECH and ECH
with spool position indicator
SI. Actuation pump to work
port B
Spool actuator ECH.
Actuation pump to
work port A
11
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
The valve can be mounted in all conceivable directions. However,
the mounting base should be flat and stable so that the valve is
not subjected to strain.
While the O-rings in the valve are normally of nitrile rubber,
there are a number of special Viton variants. (Please contact
Parker for further information.) Moreover, it is suggested that the
P70CP is selected with the variant A002, which means that the
O-rings between the parting surfaces will be manufactured from
Viton. This variant is suggested as Viton withstands heat more
comprehensively than nitrile rubber, and a constant pressure
system working at near capacity will generate more heat than an
open centre system.
Temperature
Oil temperature, working range +20 °C to 90 °C (68 to 194 °F)*
Filtration
Filtration must be arranged so that Target Contamination Class
20/18/14 according to ISO 4406 is not exceeded. For the pilot
circuit, Target Contamination Class 18/16/13 according to ISO
4406 must not be exceeded.
Hydraulic fluids
The best system performance is obtained using mineral-base oil
of high quality and cleanness in the hydraulic system.
Hydraulic fluids of type HLP (DIN 51524), oil for automatic gear-
boxes Type A and engine oil type API CD can be used.
Viscosity, working range 15-380 mm
2
/s**
Technical information in this catalogue is applicable at an
oil viscosity of 30 mm
2
/s and temperature of 50 °C (122 °F)
using nitrile rubber seals.
* Product operating limits are broadly within the above range,
but satisfactory operation within the specification may not be
accomplished. Leakage and response will be affected when
used at temperature extremes and it is up to the user to deter-
mine acceptability at these levels.
** Performance efficiency will be reduced if outside the ideal
values. These extreme conditions must be evaluated by the
user to establish suitability of the products performance.
∆p (bar) Pressure drop P1 to T2
q (l/min)
Valve with standard inlet section and end section
∆p (bar) Pressure drop P1 to T1
q (l/min)
∆p (bar) Pressure drop P2 to T1
q (l/min)
∆p (bar) Pressure drop P1/P2 to work port A or B
q (l/min)
∆p (bar) Pressure drop, work port A or B to T1
q (l/min)
* Broken line illustrates example of pressure drop in P70CF over
a D-spool for q=65 l/min in section 6.
Pressure drops
Pressure drop with the pump-unloading inlet
Pump unloading function.
See description and hydraulic circuit diagram on page 16.
10
15
5
0
0 20 40 60 80
10
15
5
0
0 20 40 60 80
10
15
5
0
0 20 40 60 80
100
120
2.5
5
7.5
10
12.5
0
0 20 40 60 80 100
6-section valve
3-section valve
1-section valve
*
Section 6
Section 1
10
15
5
0
0 20 40 60 80
6-section valve
3-section valve
1-section valve
*
Section 6
Section 3
Environmental characteristics
12
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
The circuit diagram above shows the P70CF with three
spool sections and a mid-inlet between sections 2 and 3.
Hydraulic circuit diagram showing basic functions, standard valve
For details of other options available, for the P70CP and
P70LS, please refer to the respective function areas [item
numbers] given alongside the various sub-headings that begin
on page 13.
Item
No. Code Description
16 PS Adjustable main pressure relief valve in inlet.
25 T2 Tank connection in inlet open.
26 P1B Pump connection P1 in inlet plugged.
27 P2 Pump connection P2 in inlet open.
33 T1B Tank connection T1 in end section plugged.
34 T3 Tank connection T3 in end section open.
36 / Free-flow gallery connected with tank.
50 C Spring-centred spool actuator on all sections for
stepless operation by hand.
60 D Spool for double-acting function in sections
1 and 3.
EA Spool for single-acting function working on work
port A. Work port B blocked in section 2.
The item numbers in the hydraulic circuit diagram above and
table below refer to function areas for which different options
are available. The valve above is equipped as described below .
Item
No. Code Description
66 N Load-hold check valve in each section to prevent
undesirable load sinking.
76 PA Combined port-relief and anti-cavitation valve in
work ports A and B of sections 1.
Y2 Connection between service-port A and tank gallery
blocked in section 2.
X2 Connection between service-port B and tank gallery
open in section 2 (always the case with
EA spool).
N2 Anti-cavitation valves fitted in work ports A and B of
section 3.
93 C3 Mid-inlet with power beyond connection to give
priority to preceding sections. Intended for single or
multi-pump operation.
94 PS Adjustable main pressure relief valve in mid-inlet.
Pressure gallery Tank gallery
Tank gallery
Free-flow gallery
(pump gallery)
The shaded areas indicate functions or function groups that are
described further on in the catalogue.
UL
P1
[26]
P2
[27]
T2
[25]
B A B
A
B AM1
M2
M3
T3
[34]
T1
[33]
[50] [93]
[66]
[16]
[60]
[76] [76]
[94]
[76]
[36]
Hydraulic circuit diagram
13
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Hydraulic circuit diagram showing basic functions (actuators with closed spool end)
The circuit diagram above shows the P70 with three electro-
hydraulically controlled spool sections and an integrated pilot-oil
The item numbers in the hydraulic circuit diagram above and
table below refer to function areas for which different options
are available. The valve above is equipped as described below .
For details of other options available, for the P70CP and
P70LS, please refer to the respective function areas [item
numbers] given alongside the various sub-headings that begin
overleaf .
Item
No. Code Description
15 IU Inlet with integrated bypass and pump-unloading
function
16 PS Adjustable main pressure relief valve in inlet.
22 BEN Electric pump-unloading function.
25 T2 Tank connection in inlet open.
27 P2 Pump connection P2 in inlet open.
33 PT Counter pressure function.
36 / Free-flow gallery connected with tank.
37 R35 Reducing valve for pilot-oil supply.
39 S Internal pilot-oil filter.
40 TP Separate tank connection for pilot oil.
50 ECS Spool actuator for electric remote control.
Item
No. Code Description
60 D Spool for double-acting function in sections
1 and 3.
EA Spool for single-acting function working on
work port A. Work port B blocked in
section 2.
66 N Load-hold check valve in each section to prevent
undesirable load sinking.
76 PA Combined port-relief and anti-cavitation valve in
work ports A and B of section 1 and work port A of
section 3.
Y2 Connection between service-port A and tank gallery
blocked in section 2.
X2 Connection between service-port B and tank gallery
open in section 2 (always the case with
EA spool).
N2 Anti-cavitation valve fitted in work port B of
section 3.
supply. The shaded areas indicate functions or function groups
that are described further on in the catalogue.
P2
[27]
T2
[25]
B A B A B A PF PS
PX
[76]
[36]
[40]
[37]
[39]
T4
[33]
[60]
[50][22]
[66]
[16]
[15]
TP
T3
Hydraulic circuit diagram
14
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Standard inlet section
The inlet section comes in three versions: the standard version,
version with pump unloading and version with priority function.
The standard inlet section has two pump connections, P1 and
P2, and a tank connection T2. The inlet section also contains the
pilot-operated main pressure relief valve, in which either the UL
connection for external pump unloading or the multi-level pres-
sure relief function are located (see page 17).
The P70 with closed centre (P70CP) is created by combining
inlet I with L or CUI at item [27]. P70LS shall always use the
L option at item [27]. The difference between the P70CP and
P70CF is that, in the P70CP, the open centre is used to break a
hydraulic signal rather than to convey unused pump flow to tank.
P70LS is using the open centre gallery for the load signal from
the work port to the variable pump.
Type of inlet section [15]
I Standard inlet.
(P70CF, P70CP, P70LS)
IU Inlet with integrated pump-unloading function
(P70CF only).
PRI Inlet with integrated priority function
(P70CF, P70CP, P70LS)
Pump connection,
P1 [26]
Tank connection, T2 [25]
Main pressure relief
valve [16]
Pump connection, P2 [27]
Standard inlet I with L-function
and main pressure-relief func-
tion PS (P70CP, P70LS).
Standard inlet I without main
pressure relief valve (P70CF).
Parallel connection, L [27]
P2
P1B
T2
P2
P1
T2
UL
Inlet Section
15
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Tank connection, T2 [25]
Pilot part of main
pressure relief
valve [16]
Pump unloading
solenoid, BEN [22]
Pump unloading spool
Inlet section for valve with integrated pump unloading function.
The inlet section, IU, includes a pump unloading function.
This, together with some form of overcentre valve, enables the
machine manufacturer to equip the machine with an emergency
STOP function.
Inlet section with pump
unloading and pilot-operated
main pressure relief valve.
Inlet Section
Manual override pin
P2
PX
T2
16
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Inlet Section
Inlet section for a valve with priority function
The inlet section PRI includes a priority function. The PRI inlet
gives priority of the complete valve, and it will be prioritized
before a valve connected to port EF. Both fixed and variable
pump can be used in the system, and the valve connected via
port EF can be either a load sense valve or a constant flow valve.
In a load sense system the load sense signal is received from
port X. Port X is by default plugged.
The PRI inlet is ideal for support leg functions.
LS signal
Inlet PRI in a system with fixed pump
Inlet PRI in a system with variable pump
EF
P
LS
LS
P
EF
Crane valve
PRI inlet
PRI inlet
Control section 1
Control section 1
Crane valve
Crane valve
Crane valve
Excess flow port,
to next valve
Pilot valve for main
pressure relief valve [16]
Pump connection
17
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
P2
T2
PX
B A
Main pressure relief valve [16]
The inlet section is equipped with an adjustable, pilot-operated
pressure relief valve.
PS Adjustable main pressure relief valve.
Pre-set at factory.
PB Adjustable main pressure relief valve.
Supplied factory-set and sealed.
/ Without pressure relief valve. Cavity not machined
Pressure setting [17]
Max. 320 bar. Settings above 320 bar can result in shorter service
life. The permitted maximum pressure may be higher or lower
depending on the type of application and the load spectrum.
Please contact your nearest Parker representative for help and
approval.
∆p (bar) Pressure relief characteristic, PS/PB
q (l/min)
300
350
400
50
100
150
200
250
0
0 302010 40 50 60 70
Overcentre valve
By-pass spool
Main pressure relief
valve’s pilot section
Electric unloading
valve
Circuit diagram for pump unloading
Pump unloading [22]
According to the EC Machinery Directive, machines must be
equipped with one or more emergency STOP functions to enable
actual or impending danger to be averted.
“The emergency STOP function must stop the dangerous
process as quickly as possible without creating additional
hazards and the energy supply to the function must be cut off.”
The pump-unloading inlet meets these criteria by diverting
incoming oil from the pump directly to the tank line, at the same
time blocking the pump line into the valve. This means that
no energy is transmitted to the functions. It should be noted,
however, that movements driven by dead weight will continue if
there are no overcentre valves.
N.B. The pump-unloading function is a component of the
machine safety system.
The pump-unloading function can also be used to save
energy when the valve is not being used. By engaging the pump-
unloading function when the valve is not being used, the pressure
drop Pump-to-Tank falls. This function works just as well when
downstream spool-sections are connected in parallel as well as
in series.
The solenoid BEN [22] that controls the pump unloading function
is available in 12 and 24 VDC versions. The solenoid is equipped
with a manual activating device. For details on connectors, please
see page 31.
/ Inlet not equipped with pump unloading.
BEN Inlet equipped with electrically controlled pump
unloading.
BX The inlet section is machined for the pump unloading
function and plugged. This enables the pump unloading
function to be installed at a later date, as well as the
possibility of external control of pump unloading via port
PX (see overleaf).
Inlet Section
18
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
External pump unloading or multi-level main
pressure relief function
Unloading can also be effected hydraulically by sending a
hydraulic signal from connection UL or PX (depending on type of
inlet [15] see pages 14 to 17) to external valves in an outer pilot
circuit.
The unloading function can also be used to limit the maximum
pressure for certain functions. In this way, high system pressures
that arise when light loads bottom-out can be avoided.
By means of an external pilot-circuit connected to the pilot
circuit (connection UL) of the main pressure relief valve, several
pressure levels can be set as required. In this case, however,
the external pilot valves must be set lower than the built-in one,
and each must be connected to the pilot circuit by means of a
two-way valve. The use of several different pressure levels will
increase the service life of the system.
Tank connection T2 [25]
T2 Tank connection T2 open.
T2B Tank connection T2 plugged.
Pump connection P1 [26]
Not present on inlet type IU [15].
P1 Pump connection P1 open. Normal version.
P1B Pump connection P1 plugged.
Pump connection P2 [27]
See page 8 for more information about parallel connection.
P2 Pump connection P2.
P2B Pump connection P2 plugged. Normal version.
L This option gives a parallel pump connection. This
should be used in the P70CF when the actual valve is
connected downstream of another valve. The function
separates the free flow gallery form the pump gallery.
This option must be chosen when specifying a P70LS
system.
This option is not available for inlet types IU in position
[15].
CUI This option provides a pump connection with an
unloading signal restrictor, for a variable pump. The
pump pressure enters the free flow gallery via the
CUI restrictor (Ø1.0 mm). The inlet section I [15] is
connected with the pump regulator via the P1 connec-
tion. When all spools are in neutral, the flow coming from
the pump gallery passes via the CUI restrictor to the
tank connection in the valve’s end section. The pressure
that influences the pump regulator does not arise. As
soon as a spool is shifted out of neutral, however, the
connection from the CUI restrictor to tank is broken and
the pump pressure is again directed to the pump regu-
lator via the P1 connection.
This option should be used on the P70CP
This option is not available for inlet types IU in position
[15].
Inlet Section
P2
P1
UL
T2B
P2
P1
UL
T2B
Circuit for inlet section with CUI
Circuit for inlet section with L
19
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Mid-inlet section [90]
Many compact system solutions can be obtained with the aid of a
mid-inlet section, which contains three connections connected in
different ways, depending on the choice of options.
The main pressure relief valve (see page 19) can/or should
be fitted in the mid-inlet, depending on the way in which the
system is constructed. See connection alternatives overleaf.
Several mid-inlets can be placed in one and the same valve
to give optimum system construction.
The mid-inlet section can only be selected for the P70CF.
Connection, M1 Connection, M3
Main pressure relief
valve [94]
Connection, M2
Mid-inlet viewed looking
towa rd the inlet section
Pilot part of main
pressure relief
valve [16]
Mid-inlet Section
20
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Options, mid-inlet [93]
C3 Mid-inlet, with power beyond connection, that gives
priority to the upstream sections. Flow which is not used
in sections upstream of the mid inlet will be added to the
incoming flow of the inlet M3. This option is intended for
both single and multi pump operation.
C5 Mid-inlet, without flow summation. Valves fitted with C5
function as two separate valves fitted with a common
tank connection. If a separate tank connection is fitted to
port M1, the pump to tank pressure will be reduced. This
option is intended for multi pump operation only.
C6 Mid-inlet with possibility of external power beyond
connection via external check-valve between M1 and
M3, with priority given to upstream sections, but without
flow summation. Intended for multi-pump operation.
Main pressure relief valve [94]
The mid-inlet can be fitted with the same main pressure relief
valve as is fitted in the standard inlet. For further information and
technical data, please see Inlet section [16] on page 16.
In systems in which several different pressure levels are
required, main pressure relief valves can be fitted to give different
pressure levels before and after the mid-inlet.
PS Adjustable main pressure relief valve. Delivered with
opening pressure pre-set as per specification.
PB Adjustable main pressure relief valve. Delivered pre-set
and factory-sealed.
Y Without pressure relief valve.
Pressure setting [98]
Max. 320 bar. Settings above 320 bar can result in shorter service
life. The permitted maximum pressure may be higher or lower
depending on the type of application and the load spectrum.
Please contact your nearest Parker representative for help and
approval.
Mid-inlet, C3. Used in multi-pump systems and when upstream
sections are to have priority over flow delivered by the pump
connected to the inlet section [15]
Mid-inlet, C5. Used in multi-pump systems. Valve functions as two
separate valves, but with common tank gallery.
Mid-inlet, C6. Used for separate feeding (port M2) of non-priori-
tised sections upstream of the mid-inlet. See page 22.
B M2 M3
M1
T1
T3B
A B A
B M2 M3
M1
T1
T3B
A B A
B M2 M3
M1
T1
T3B
A B A
Mid-inlet section
Mid-inlet section
Mid-inlet section
Mid-inlet Section
21
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
End section for standard valve
The end section is available in two different versions, the
standard version and one with an integrated pilot-pressure
supply. The standard end-section is equipped with two tank
connections, T1 and T3. A series-connection function can be
fitted in T3 to feed downstream valves. See page 8. For valves
with integrated spool-actuators, the end section includes a pres-
sure-reducing valve for the pilot-pressure supply, as well as a
tank connection T4.
Type of end section [30]
US Standard end-section.
USP End section with pilot-pressure generation.
Tank connection T1 [33]
T1 Tank connection T1 open (normal version).
T1B Tank connection T1 plugged.
PT Counter pressure valve that raises pressure to 5 bar in
free-flow gallery to ensure that the minimum requisite
pilot-pressure is maintained (USP only).
PT8 Counter pressure valve that raises pressure to 8 bar in
free-flow gallery to ensure that the minimum requisite
pilot-pressure is maintained (USP only).
LD This is a tank connection with a drain cartridge fitted.
This must be used in the P70LS.
Tank connection T3 [34]
T3 Tank connection T3 open.
T3B Tank connection T3 plugged.
Series-connection function [36]
/ Without power beyond connection.
S Series-connection function used to block connection
between free-flow gallery and tank. Flow in free-flow
gallery fed to subsequent valve through either T1 or
T3 connection. Tank connection T2 in the inlet must be
open.
Tank connection,
T1 [33]
Tank connection T3 open. Free-flow gallery connected with tank
gallery in the end section.
Tank connection T3 open.
Open centre gallery connected
with tank through LD at item
[33]. P70LS only.
End section viewed looking
toward inlet section
Tank connection, T3 [34]
T3
T1B
AB
T3
T1B
T3
LD
Spool section Standard end-section
End section equipped with S-
function. The free-flow gallery’s
connection with the tank gallery
is blocked.
End Section
22
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Separate tank connec-
tion for pilot tank, TP
[40]
Reducing valve for
pilot oil, R35 [37]
End section viewed looking
toward inlet section.
Tank connection T1 [33]
Tank connection, T3 [34]
External supply of
pilot pressure, PS
PF, take-off
for pilot oil to
external filter
Pilot-oil
strainer,
S [39]
End section with integral pilot-oil supply
Reducing valve [37]
Internal pilot-pressure supply is a valve function built into the
end section, which acts both as a reducing valve and a pressure
relief valve in the pilot circuit. For safety reasons, it is furnished
with a separate safety valve function that prevents the maximum
permissible reduced pressure from being exceeded.
A pilot pressure for external use, e.g. for the PCL4 remote-
control valve, can be tapped via the PS connection.
/ Without reducing valve
R35 Reducing valve set at 35 bar.
Pilot-oil strainer [39]
S Coarse filter with by-pass function in the internal pilot-
pressure supply. Filter protects pilot circuit from dirt,
especially during start-up of system.
YS Adaptor for connection of external pilot-pressure filter.
Enables pilot circuit to be supplied with cleaner oil
compared with the rest of the system (recomended).
Separate tank connection for pilot circuit [40]
TP Separate tank connection for pilot circuit is open. The
connection to the main tank gallery in the directional
valve is blocked. This function is suitable for systems in
which there is a risk of dynamic pressure variations in
the tank line causing variations in the pilot circuit when
there is a common tank line.
TPB This end section has a separate tank connection for the
pilot circuit, which is machined and plugged. The pilot
circuit’s return to tank is connected to the valve tank
gallery.
TPC The pilot circuit’s tank gallery is connected to the main
tank gallery via a check valve. The check valve is used
to prevent pressure peaks reaching the spool actuators.
P
red
(bar)
q
red
(l/min)
P
red
= reduced pressure
q
red
= take-off flow from reducing valve
Tank connection T3 open. Free-flow gallery connected with tank
via counter pressure function, PT [33].
30
40
10
20
0
0 5 10 15 20 25
PF PS
[36]
[40]
[37]
[39]
T4
[33]
TP
T3
End Section
R35
23
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
The P70 is stackable and can be supplied in combinations of 1 to
10 spool sections. For each spool section, there is a wide range
of spools and spool actuators to choose between. This enables
optimal adaptation of individual spool sections to suit the appli-
cation and control function. The spool sections have machined
control edges for precise control characteristics.
Type of spool section [47]
P Parallel-connected section
Work port B
Work port A
Check valve, N [66]
Spool actuator [50]
Spool func-
tion [60]
Port relief valve, PA, port A [76]Connection between work port and
tank gallery blocked, Y2, port B [76]
Spool section, P, with open spool end.
Parallel-connected section.
Spool Sections
24
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
LU
LMA
Lever bracket [51]
LMA Lever bracket for open spool end. Lever itself not
included. Must be ordered separately (see page 32).
LMB Lever bracket for open spool end. Lever itself not
included. Must be ordered separately (see page 32).
LU No lever bracket – open spool end.
* Spool in (← ) gives actuation P-A, B-T.
Spool out (→ ) gives actuation P-B, A-T.
MJA Lever bracket and link parts for mechanical joystick,
type A, and for open spool end. Lever bracket MJA
have always to be selected in the left section and lever
bracket MJ in the right section. Lever itself not included.
Must be ordered separately (see page 33).
MJB Lever bracket and link parts for mechanical joystick,
type B, and for open spool end. Lever bracket MJB
have always to be selected in the left section and lever
bracket MJ in the right section. Lever itself not included.
Must be ordered separately (see page 33).
LMB
Lever
bracket
Spool*
Spool*
Spool*
Lever
bracket
Spool Sections
MJA
MJB
MJA complete
25
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
C/C140
B2C
CB
ACE
Actuation
P-B, A-T
Actuation
P-A, B-T
D101727
ACP
D101727
Spool actuators [50]
A large number of spool actuators is available for the P70CF.
They are divided into three different groups: hand-operated, ON/
OFF remote controlled and proportionally remote controlled.
Hand-operated spool actuators with open spool end
C/C140 Spring-centered spool actuator. Actuator for stepless
control with spring centering to neutral position.
C140 has stronger centering force. Recommended
when cable control or mechanical linkages are used.
B2C Three-position, spring-centered spool actuator. The B2C
has mechanical detents at the two end positions, so that
the spool stays in place when fully actuated in either
direction. It must be shifted out of the respective end
positions manually.
CB Float-position spool actuator. The CB is a special
actuator for F-spools (see page 29). It features step-
less operation, with spring centering from the two end
positions to neutral. It also has a fourth position with a
mechanical detent. The spool must be shifted out of the
fourth position manually.
Remote controlled spool actuators with open
spool end and possibility of manual control
ACE An electro-pneumatic ON/OFF control with spring
centering and the possibility of stepless operation
by means of a lever.
Primary air: 4 – 10 bar
Control current: 12 VDC min. 0.85 A
24 VDC min. 0.42 A
Voltage tolerance: ± 20%
The spool actuator has a common pressure gallery for
primary air. The primary air can be connected to either
the first or the last valve section directly by means of a
plug-in connector for Ø6 mm air hose.
ACP A pneumatic proportional spool actuator with spring
centering and the possibility of stepless operation by
means of a lever. The ACP is best controlled by the
Parker VP04 remote control valve.
Breakaway pressure:* 2 bar
Final pressure:* 7 bar
Permissible air pressure in pilot cap Max. 10 bar
Connections: G1/8 or NPTF 1/8-27
*
The breakaway pressure refers to the pressure needed for the
directional valve to open the connection “pump to work port”. The
final pressure is the lowest pressure needed to effect full actua-
tion of a spool in the directional valve. The foregoing data must
be taken into consideration when choosing control units, since
the opening pressure of the control unit must be lower than the
breakaway pressure of the spool actuator in order to avoid jerky
starting and stopping. However, the control unit’s final pressure
must be higher than the final pressure of the directional valve
in order to ensure that the spools can be fully actuated. This is
important for the P70CF because, if the spool is not actuated
fully, the free-flow gallery will not close, with the result that a
certain amount of flow will go directly to tank.
Spool Sections
Also see spool
position indicator SI
on page 28
26
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Actuation
P-B, A-T
Actuation
P-A, B-T
PC
FPC
PC Hydraulic, proportionally controlled, spring-centred
spool actuator. Best controlled by PCL4 remote control
valve (see separate brochure).
Breakaway pressure:* 6 bar
Final pressure:* 17 bar
(max. 35 bar)
Connection thread: G1/4 or 9/16-18 UNF
FPC Hydraulic, proportionally controlled, spring-centered
spool actuator with a fourth position for shifting the
spool into the float position.
Valves with FPC have to be feeded with external
pilot pressure in open centre systems
(Not in CP/LS).
Breakaway pressure:* 6 bar
Final pressure:* 16 bar
(max. 18 bar)
Pressure for float position: min. 24 bar
(max. 35 bar)
Connection thread: G1/4 or 9/16-18 UNF
*
The breakaway pressure refers to the pressure needed for the
directional valve to open the connection “pump to work port”.
The final pressure is the lowest pressure needed to effect full
actuation of a spool in the directional valve. With the FPC spool
actuator, the float position is obtained by further increasing the
final pressure from max. 18 bar to min. 24 bar. The foregoing data
must be taken into consideration when choosing control units,
since the opening pressure of the control unit must be lower than
the breakaway pressure of the spool actuator in order to avoid
jerky starting and stopping. However, the control unit’s final pres-
sure must be higher than the final pressure of the directional
valve in order to ensure that the spools can be fully actuated.
This is important for the P70CF because, if the spool is not actu-
ated fully, the free-flow gallery will not close, with the result that a
certain amount of flow will go directly to tank.
Remote controlled proportional spool actuators with closed spool end
Work port B Work port A
Spool Sections
27
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
ECS Electro-hydraulic proportional spool actuator
The ECS is an electro-hydraulically, proportionally
controlled, spring-centred spool actuator. The PS25
cartridge valve is used as its remote control valve.
The ECS spool actuator is best controlled by means of
a Parker electric remote-control system (see separate
brochure). The electrical connector must be ordered
separately (see page 31).
Voltage 12 V 24 V
Breakaway current:* max. 500 mA max. 260 mA
Final current:* min. 1010 mA min. 510 mA
Solenoid (PS25): max. 1450 mA max. 730 mA
100% ED 100% ED
Coil resistance
at +20 °C: 5.4 Ω 21.7 Ω
Inductance: 27.7 mH 7.0 mH
Tank pressure: max. 15 bar max. 15 bar
ECH As above, but with possibility of stepless operation by
means of a hand lever. Valve is delivered with lever
bracket, but lever itself must be ordered separately
(see page 33).
Solenoid variant [59]
A027 The A027 spool actuator has the same data as the ECS,
the difference being that the Solenoid valve in the A027
is equipped with both manual-override and air bleed
functions. This option must be chosen in position [59]
and with ECS or ECH in position [50].
Remote controlled proportional spool actuators with closed spool end
and possibility of manual operation
Actuation
P-B, A-T
Actuation
P-A, B-T
Damping
restrictor [55B]
Damping restrictor
[55A]
*
The breakaway current refers to the current needed for the direc-
tional valve to open the connection “pump to work port”. The final
current is the lowest current needed to effect full actuation of a
spool in the directional valve. This data must be taken into consid-
eration when choosing control units, since the opening current
of the control unit must be lower than the breakaway current of
the spool actuator in order to avoid jerky starting and stopping.
However, the control unit’s final current must be higher than the
final current of the directional valve in order to ensure that the
spools can be fully actuated. This is important for the P70CF
because, if the spool is not actuated fully, the free-flow gallery
will not close, with the result that a certain amount of flow will go
directly to tank.
Connector Type [56]
The connector of the solenoid is of type:
A AMP Junior-Timer type C.
D Deutsch type DT04-2P. Mates with DT06-2S Plugs.
The connector must be ordered separately.
ECH
D101729
ECS
Spool Sections
Also see spool
position indicator SI
on page 28
Work port B Work port A
28
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Spool Sections
FECS Electro-hydraulic, proportionally controlled, spring-
centered spool actuator with a fourth position for shifting
the spool into the float position. The PS25 cartridge
valve is used as its remote control valve.
Valves with FECS have to be feeded with external
pilot pressure in open centre systems
(Not in CP/LS).
The FECS spool actuator is best controlled by means of
a Parker electric remote-control system (see separate
brochure). The electrical connector must be ordered
separately (see page 31).
Voltage 12 V 24 V
Breakaway current:* max. 500 mA max. 260 mA
Final current:* min. 1010 mA min. 510 mA
Float position current: max. 1450 mA max. 730 mA
min. 1410 mA min. 690 mA
Solenoid (PS25): max. 1450 mA max. 730 mA
100% ED 100% ED
Coil resistance
at +20 °C: 5.4 Ω 21.7 Ω
Inductance: 27.7 mH 7.0 mH
Tank pressure: max. 15 bar max. 15 bar
FECS
Remote controlled proportional spool actuators with closed spool end
*
The breakaway current refers to the current needed for the direc-
tional valve to open the connection “pump to work port”. The final
current is the lowest current needed to effect full actuation of a
spool in the directional valve. With the FECS spool actuator, the
float position is obtained by further increasing the final current,
see table. The foregoing data must be taken into considera-
tion when choosing control units, since the opening current of
the control unit must be lower than the breakaway current of
the spool actuator in order to avoid jerky starting and stopping.
However, the control unit’s final current must be higher than the
final current of the directional valve in order to ensure that the
spools can be fully actuated. This is important for the P70CF
because, if the spool is not actuated fully, the free-flow gallery
will not close, with the result that a certain amount of flow will go
directly to tank.
Connector Type [56]
The connector of the solenoid is of type:
A AMP Junior-Timer type C.
D Deutsch type DT04-2P. Mates with DT06-2S Plugs.
The connector must be ordered separately.
Actuation
P-B, A-T
Actuation
P-A, B-T
Damping
restrictor [55B]
Damping restrictor
[55A]
Work port B Work port A
29
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Spool Sections
Spool position indicator [52]
The spool actuators type C, C140 ECS and ECH can be
equipped with an electric spool position indicator. It has one
analog signal output linear, proportional to posistion of the spool
between -1.5 and +1.5 mm of spool stroke according to the
diagram below.
SI Spool position indicator (SSP2)
Connector must be ordered separately (see page 31)
ECS cap with spool position indicator (SSP2)
2.5
4.5
0.5
-6 -1.5 0 +1.5 +6
Voltage [V]
Spool stroke [mm]
30
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
The spool is the most important link between the actions of the
operator and the movement of the controlled function. Parker
therefore goes to great lengths to optimise spools for different
flows, load conditions, functions and applications. Since this is a
process of continuous development work, new spools are being
introduced all the time. For this reason, the many different spools
available are not detailed in this catalogue. Parker’s computerised
specification program will generate proposals for suitable spools
for the application and functions of the hydraulic system in your
machine.
Spool function [60]
Spools are divided into different groups, depending on their basic
function.
D Double-acting spool. Blocked in the neutral position.
EA Single-acting spool. Blocked in the neutral position and
work port B blocked.
EB Single-acting spool. Blocked in the neutral position and
work port A blocked.
M Double-acting spool. Work ports connected to tank (float
position) in neutral.
F Double-acting spool with fourth position in which
both work ports are connected to tank (float position).
Blocked in neutral position.
CA Regenerative spool for rapid feeding of a cylinder, or
for flow saving. The large side of the cylinder is always
connected to work port A.
Certain spools have been equipped with drainage from work port
to tank when the spool is in neutral. Drainage (approx. 2 mm
2
)
serves to prevent pressure build-up in the work port. Such
drainage is used primarily in combination with different types of
external overcentre valve. The spool designation is affected as
follows: A lower-case letter is suffixed to the usual spool designa-
tion indicating function, e.g. the D-spool becomes a Da-spool to
indicate drainage from service-port A to tank.
a Drainage of service-port A to tank
b Drainage of service-port B to tank
m Drainage of work ports A and B to tank
Please note that LS spools have a different coding system.
All LS spool have “ls” after the spool codes leading letter e.g.
a double acting spool, normal code D, would become Dls and for
a single acting spool, normal code EA, would become EAls.
For spool selection including drainage, the drainage letter is
placed at the end of the code e.g. for a single acting spool with
drainage from work port A, the code would be EAlsa.
Spool designation [69]
Each spool version is imprinted with an alphabetical code to facili-
tate identification during tuning or servicing in the field.
Pressure gallery [66]
N Load-hold check valve to prevent undesirable sinking of
a heavy load while a light load is in operation.
(Standard)
Pressure gallery always fitted with check valve (N).
B A
D
B T A
EA
EB
M
F
CA
Da
Dm
P P T
Choice of Spool
31
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
In the diagram above:
Section 1, work port B, is fitted with a Y2-plug (1) to block the
connection to tank.
Section 1, work port A, is fitted with an anti-cavitation valve N2
(2).
Section 2, work port B, is equipped with a combined port-relief
and anti-cavitation valve (3) to limit the pressure and prevent
cavitation.
Section 2, work port A, is connected to tank - X2 variant - in the
case of EB spools (4).
∆p (bar) Anti-cavitation characteristic
q (l/min)
∆p (bar) Port-relief characteristic
q (l/min)
The curve shows the pressure drop between the tank connection
and work port when port relief valve (PA) or anti-cavitation valve
(N2) without port-relief function is used as an anti-
cavitation valve.
Pressure limiters in work ports [76A/B]
(Port relief valves)
The work ports can be equipped with individual port-relief and/or
anti-cavitation valves.
PLC cartridge valves are used as port relief valves. They
are renowned for their long service life, tightness, fast opening
sequence and good characteristics over the
entire flow range.
Port relief valve [76]
/ Hole for port relief valve not machined.
X2 Work port connected with valve’s tank gallery.
Y2 Connection between work port and tank gallery blocked.
(Cavity plug)
N2 Anti-cavitation valve fitted. The anti-cavitation valve
serves to ensure that, in the event of a lower pressure
in the work port than in the tank, oil can be sucked from
the system oil tank to the consumer. To improve the anti-
cavitation function, the oil tank can be pressurised .
Note that the counter pressure valve PT [33] does not
influence the pressure in the anti-cavitation valve’s tank
line.
PA PLC combined port-relief and anti-cavitation valve fitted.
Valve is factory-set at the specified pressure. Optional
pressure settings: 50, 63, 80, 100, 125, 140, 160, 175,
190, 210, 230, 240, 250, 260, 280, 300, 320 and 350
bar.
Since the cavities for X2, Y2, N2 and PA have the same
machining, it is easy to change the function of an existing valve.
B A AB
4321
300
350
400
450
50
100
150
200
250
0
0 10 20 30 40 50 60 70
30
35
5
10
15
20
25
0
0 20 40 60 80 100
Spool Sections
32
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
P70 valves can be equipped with manifold-type function blocks
that enable total system solutions to be integrated into the valve.
Function blocks (manifolds)
D101737
Please contact your Parker representative for more information
about integral system solutions. In addition to standard function
blocks, special function blocks can be designed by our experi-
enced product and system designers to exactly meet your needs .
The function block above was specially adapted for a
customer. Like most of our function blocks, it was constructed
with the aid of cartridge valves. Only the housing itself is a unique
component.
Spool Sections
Connectors
Connectors are not included with spool actuators, and should be
ordered separately or ordered from your local connector supplier.
Spool actuators ECH, ECS, FECS [50]
Suitable connectors for option A in pos [56] are:
AMP Junior-Timer type C, 963040-3,
Bosch 1 928 402 404.
The connector also fit pump-unloading function BEN [22].
Suitable connectors for option D in pos [04] are:
Deutsch type DT06-2S.
For available connector kits from MCDE, see catalogue
HY17-8558/UK.
Spool actuator ACE
Suitable connector kit is:
Hirschman.
Spool position indicator SI
Suitable connector is:
Binder Sensor connector Series 763 (M12x1) 4 contacts female.
33
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Spool Sections
Hand levers
Levers are not supplied with the valve and must therefore be
ordered separately.
They are furnished with window-type knobs, so that machine
builders can insert the appropriate function symbol beneath a
transparent cap to indicate the function of the lever. Levers are
supplied complete with mounting kits.
Alternative lever
placement
Lever: Length Length Ordering No. Ordering No.
L mm L (inch) 1 piece 25 pieces
MP1 179 (7.05) 8234 9390 21 8234 9390 21 25
MP3 202 (7.95) 8234 9390 23 8234 9390 23 25
MP6 122 (4.80) 8234 9390 26 8234 9390 26 25
MP11 302 (11.89) 8234 9390 31 8234 9390 31 25
MP12 194 (7.95) 8234 9390 32 8234 9390 32 25
MP8 171 (9.84) 8234 9390 28 8234 9390 28 25
MP13 246 (9.69) 8234 9390 33 8234 9390 33 25
MP14 165 (6.50) 8234 9390 34 8234 9390 34 25
MP15* 165 (6.50) 8234 9390 35 8234 9390 35 25
* Red knob
Hand levers for open spool-actuators
Hand levers for closed spool-actuatorsHand levers for mechanical co-ordinate control for
open spool-actuators
L
MP1
MP3
L
L
L
L
MP6
MP11
MP12
MP8
L
L
L
MP13
MP14
MP15
34
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
(inch)
No. of K K
sections
mm inch
1 140 (5.51)
2 182 (7.17)
3 224 (8.82)
4 266 (10.47)
5 308 (12.13)
6 350 (13.78)
7 392 (15.43)
8 434 (17.09)
9 476 (18.74)
10 518 (20.39)
Standard valve
For connection dimensions, please see page 10.
Dimensional drawings
P1
T3
A
B
A
B
A
B
T2
T1
T1
T3
P2
T2
P2
UL
UL
38
(1.50)
38
(1.50)
80 (3.15)
96.5 (3.80)
45 (1.77)
28 (1.10)
9 (0.35)
32
(1.26)
111 (4.37)
97 (3.82)
82 (3.23)
38 (1.50)
Ø11
(0.43)
29
(1.14)
5
(0.20)
11 (0.43)
107 (4.21)
101 (3.98)
137 (5.39)
66 (2.60)
45 (1.77)
K
42 (1.65)
42 (1.65)
53 (2.09)
38
(1.50)
28
(1.10)
46
(1.81)
45
(1.77)
34
(1.34)
48
(1.89)
96.5(3.80)
E
35
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Model with closed spool end
For connection dimensions, please see page 10.
Dimensional drawings
T2
P2
T3
LD
PF
TP
PS
PX
X
T2
PX
P2
T4
T4
T3
T1
T1
PF
B
A
B
A
B
A
PS
TP
37
(1.46)
29
(1.14)
42
(1.65)
L
42
(1.65)
42
(1.65)
53
(2.09)
98.5 (3.80)
60 (2.36)
81 (3.19)
81 (3.19)
19 (0.75)
20
(0.79)
24
(0.94)
100 (3.94)
97 (3.82)
94 (3.70)
71 (2.80)
84 (3.31)
80 (3.15)
5 (0.20)
17 (0.67)
82 (3.23)
97 (3.82)
48 (1.89)
38 (1.50)
22
(0.87)
105 (4.13)
85 (3.53)
45 (1.77)
33
(1.30)
127 (5.00)
241 (9.49)
99 (3.90)
183 (7.20)
Ø11
(0.43)
Lever
attachment
No. of L L
sections
mm inch
1 155 (6.10)
2 197 (7.76)
3 239 (9.41)
4 281 (11.06)
5 323 (12.72)
6 365 (14.37)
7 407 (16.02)
8 449 (17.68)
9 491 (19.33)
10 533 (20.98)
(inch)
E
36
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
Spool stroke 6.0 mm
(0.24); opens pump
to work port B.
Spool stroke 12.5 mm
(0.49) for spool function
F [60]. Others 6.0 mm
(0.24). Opens pump to
work port A.
Spool actuators
(inch)
LU
C/C140
B2C
CB
LMB
Dimensional drawings
71 (2.80)
45.5 (1.79)
78 (3.07)
Ø8
(0.31)
Ø8
(0.31)
44.5 (1.75)
26
(1.02)
44.5 (1.75)
37
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
ACE
104 (4.09)
83 (3.27)
122 (4.80)
78 (3.07)
ACP
Dimensional drawings
Spool actuators
(inch)
38
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
51.3 (2.02)
48.3 (1.90)
75 (2.95)
40 (1.57)
50 (1.97)
29 (1.14)
ECS
ECH
Dimensional drawings
PC
FPC
Spool actuators
(inch)
39
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
P70
Catalogue HY17-8546/UK
© 2010 Parker Hannin Corporation. All rights reserved. Catalogue HY17-8546/UK, POD, 11/2010, ZZ
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