K170LS
Mobile Directional Control Valve
Proportional, Load Sensing, Pre-compensated
2
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Catalogue layout
This catalogue has been designed to give a brief overview of
K170LS valves, and to make it easy for you to study and choose
from the different options available, so that we may customize
your valve in accordance with your wishes. In addition to general
information and basic technical data, the catalogue therefore
contains descriptions of the options available for various
so-called “function areas” of the valve.
Each function area is given as a subheading, followed by a
brief description. When options are available for a function area,
the subheading is followed by an “Item number” in brackets, e.g.
Pressure relief valve [16]. This is followed by a series of coded
options, e.g. PA1, Y1, together with a brief description of what
each code represents. Alternatively, one or more pressure, flow
or voltage options are given.
On page 8 is a general circuit diagram showing the basic
function areas in a K170LS valve and the item numbers that
represent them. Naturally, the same item numbers are used for
the respective function areas in all sub-circuit diagrams that
appear elsewhere in the catalogue. Please note that, unless
stated otherwise, all sections and views of the valves have been
drawn as seen from the inlet section.
How to order your valve
The K170LS directional control valve can be easily specified
using Parker computer programme. This means the customer
can optimise his valve specification to give the best performance
for his application and specific hydraulic system.
Once the demands placed on each individual function have
been specified the computer will select the valve design required
to give optimum performance. The computer also produces
complete documentation for your valve, in the form of a detailed
specification and hydraulic circuit diagram.
The computer also generates a unique identification number for
each valve type and customer. The number is then stamped into
the I.D. plate of each valve. The specification of your valve is then
recorded by Parker, so that exact identification of the product can
be made at any time in the future to facilitate repeat ordering or
servicing.
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
Early consultation with Parker saves
time and money
Our experienced 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
best system for the desired combination of functions, control
characteristics and economic demands. By consulting Parker
early in the project planning stage, you are assured of a compre-
hensive hydraulic system that gives your machine the best
possible operating and control characteristics.
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.
3
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Contents
Contents Page
General Information ...................................................................................4
Technical Data ........................................................................................6-7
Hydraulic circuit diagram ...........................................................................8
Inlet Section ..............................................................................................9
Internal pilot pressure supply [12] ........................................................9
Pilot pressure [13] ................................................................................9
Pilot filter [14] ........................................................................................9
Load signal system .............................................................................10
Inlet section type [15] .........................................................................10
Pressure relief valve [16] ....................................................................10
Pressure setting [17] ..........................................................................11
Tank connection T2 [24] .....................................................................11
Counter pressure valve ......................................................................11
Tank connection T1 [25] .....................................................................11
Pump connection P1 [26] ...................................................................11
End Section .............................................................................................12
End section [30] ..................................................................................12
LS-connection [31] .............................................................................12
Pump connection P2 [32] ...................................................................12
Tank connection T3 [34] .....................................................................12
Separate tank connection for the pilot circuit [40] ...............................12
Spool Section ..........................................................................................13
Spool section with actuator type PC ...................................................13
Spool actuators [50] ...........................................................................14
PC, PCH - Hydraulic spool actuator ..............................................14
Electro-hydraulic proportional spool actuator ................................15
Connector types [56] .....................................................................15
Pilot restrictor [55 A,B]...................................................................16
Spool options .................................................................................17
Spool function [60] .........................................................................17
Flow requirement [61 A,B] .............................................................17
Area relationship [62] ....................................................................18
Load characteristics [63] ...............................................................18
Force feedback [64 A,B] ................................................................18
Pressure compensator and/or load-hold check valve [66] .............19
Pressure compensators ................................................................19
Damping of pressure compensator [67] ........................................20
Spool designation [69] ...................................................................20
Flow settings [72] ..........................................................................20
Feed reduction valves [75] ..................................................................20
Setting of feed reduction in the A-port [75A] ......................................20
Setting of feed reduction in the B-port [75B] ......................................20
Port relief and/or anti-cavitation valves [76 A,B] .................................21
Separate anti-cavitation valve in service ports ...................................21
Anti cavitation characteristics .............................................................21
Function block [90-99] ........................................................................22
Accessories .............................................................................................22
Dimensional drawing ...............................................................................23
[00] refers to item numbers in the customer specification.
4
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
The K170LS is a stackable, proportional,
load-sensing (LS), pressure-compensat ed
directional control valve, which can also
be adapted to give force-feedback. It is
designed for many different applications,
both mobile and industrial, and is widely
used in machines such as front-end
loaders, backhoe loaders, excavators,
cranes, forestry equipment, metal presses
and forging hammers.
With its function-adapted spool
sections, wide range of additional func-
tions and standard accessories, the
K170LS en ables the user to optimise the
machine and its hydraulic system in the
following ways:
Compact system construction
While the K170LS can contain many
integrated functions, it requires a minimum
of external piping. With the aid of a special
combo-inlet, it can be mounted directly to
the similar, smaller-flow L90LS directional
valve, giving great compactness and
outstanding operating economy.
Freedom in machine design
The K170LS is designed for proportional
hydraulic or electro-hydraulic remote
control. This gives great freedom in
the location of components, and in the
running of pipework, hoses and cables.
Economy
The K170LS can be modified or expanded
to suit customer specifications. Function
and application adaptation enables energy
consumption to be kept to a minimum.
Control characteristics
The control characteristics for both lifting
and lowering movements are outstanding,
thanks to the unique function adaptation
of spools, pressure compensators, feed
reducing valves etc. Each function is
completely independent of other simulta-
neously operated functions.
Construction
The K170LS is a stackable valve, and
can be delivered in combinations of 1 to
9 spool sections. It is designed for system
pressures of up to 330 bar, and can be
fitted with motor-port relief valves that
open at a maximum pressure of 350 bar.
Suitable flow range can be up to 280 l/min
(2x280 l/min with mid inlet). The recom-
mended flow per section is 170 l/min with
a pressure compensator, and 220 l/min
without.
As an optional, the K170LS can be
given a built-in pilot pressure supply in
the inlet section, as well as pressure
compensation and feed reduction in
the spool sections. The feed reducer
is adjustable from 30 to 330 bar. Force
feedback (optional) enables a force-
sensing function to be incorporated in to
the valve. Moreover, fixed or pilot-operat ed
counter pressure valves can be integrated
into inlet section to give back-pressure
supported load lowering and exceptionally
god anti-cavitation characteristics.
System adaptation
The K170LS is a load sensing,
pressure-compensated directional valve
with unique possibilities for adaptation in
respect of both functions and applications
to systems with variable LS pumps.
Valve characteristics
• Copied load signal - The system
permits consumption in the load signal
line to the pump, without the signal
level being affected.
• Pressure compensation - Pres-
sure-compensated spools for lifting
and lowering movements. Separate
compensator for each spool section for
excellent pressure compensation.
• Feed reducers - Individually adjustable
for each service port. Reduction can
also be controlled remotely.
• Force feedback-provider “feeling” to the
operator, gentle transition across speed
changes and greater stability in the
hydraulic system.
• Counter pressure valve - Built-in
counter pressure valve in two versions
(fixed setting or pilot control) for best
application-adaptation.
• Flexible, modular construction makes it
easy to re-build or expand the valve to
meet changing needs.
• Our port-relief valves have outstanding
pressure characteristics, even as
secondary pressure limiters, and
respond very quickly to sudden
changes in load.
• The valve can be flanged to specially
adapted Parker function blocks that
enable even more functions to be inte-
grated into a compact, single unit with
minimal piping.
General Information
5
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
K170LS with built-in hydraulic, electro-hydraulic, or combined
manual and electro-hydraulic spool actuator. In this example, the
valve is not equipped with a copying function for the load signal
(LS).
The K170LS valve connected to a L90LS valve. The L90LS valve
is used for functions which requires less flow. This gives price ad-
vantages as well as operational advantages. The valve in this ex-
ample fitted with an internal pilot pressure supply and individual
pressure compensator, feed reduction and pressure relief valves.
B A B A B A
LSPB
T2B
T1
PL
PX
LS
P1
PS
B A B A TP B A B A
PS
P1
PL
PX
T1
T2B
TX
P1B
LS
General Information
6
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Pressure
Pump inlet max 330
1)
bar (4800
1)
psi)
Service ports max 350
1)
bar (5000
1)
psi)
Pump regulator ∆p min 18
2)
bar (260
2)
psi)
Compensator K3 ∆p min 30
2)
bar (435
2)
psi)
Return line pressure, static max 20 bar (290 psi)
1) Pressures given are maximum absolute relief pressures
2) Pressure drop pump to valve max 3 bar (44 psi)
Internal pilot pressure
Standard setting 35 bar (500 psi)
Optional setting 45 bar (650 psi)
Feed reducer
Adjustment range 30 to 330 bar
(435 to 4800 psi)
Counter pressure valve
Fixed setting 5 bar (70 psi)
Pilot operated, signal pressure max 30 bar (435 psi)
Pressure ratio,
pilot signal : counter pressure 1.2 : 1
Pump connection
P1 [26]
Load pressure
not copied, PL
Gauge port,
Pump pressure
PX
Copied load
signal, LS
Pilot pressure
supply for
external use, PS
Tank connection
T1 [25]
Tank connection
T2 [24]
Connection for
hydraulic remote
control, PC
(A and B side)
Service port A
Pump
connection
P2 [32]
LSP, LS connection
from parallel valve [31]
Service port B
Tank
connection
T3 [34]
Separate tank
connection for
pilot circuit,
TP [40]
Pilot operation of
counter pressure
valve MP [24]
Technical Data
Recommended flow rates
Pump connection max 280
3)
l/min (75 USgpm)
Service port with compensator max 170
4)
l/min (45 USgpm)
Service port without compensator max 220
4)
l/min (60 USgpm)
Return from service port max 280 l/min (75 USgpm)
3) 2 x 280 l/min (2 x 75 USgpm) with mid inlet section
4) Depending on spool version
Temperature
Oil temperature, working range +20 to 90 °C (68 to 194 °F)*
* 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.
7
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
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
Best 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 using nitrile
rubber
Weight
Inlet section 8.5 kg 18.7 lb approx.
Spool section type PC 9.1 kg 20.1 lb approx.
Spool section type EC 10.8 kg 23.8 lb approx.
End section 4.1 kg 9.0 lb approx.
Combo-inlet 11.5 kg 25.4 lb approx.
** 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.
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.
Connec-
tion
In section G-ver-
sion.
UNF-version
P1 inlet section G 1 1 5/16-12 UN-2B
T1, T2 inlet section G 1 1 5/16-12 UN-2B
P1 combo-inlet CL Flange SAE 1 High pres-
sure ISO 6162-2
T1 combo-inlet CL Flange SAE 1 1/4 Std
pressure ISO 6162-1
T2 combo-inlet CL G 1 1 5/16-12 UN-2B
LS, PL,
PX, PS
inlet, combo-inlet CL G 1/4 9/16-18 UNF-2B
MP inlet section G1/4 9/16-18 UNF-2B
P2 end section G 1 1 5/16-12 UN-2B
T3 end section G 1/4 9/16-18 UNF-2B
TP end section G1/4 9/16-18 UNF-2B
TP combo-inlett CL G 3/8 3/4-16 UNF-2B
PS end section and
combo-inlett CL
G 1/4 9/16-18 UNF-2B
LSP spool/end section MU 9/16-18 UNF-2A (ORFS
pipe end, male)
LSP end section G 3/8 9/16-18 JIC (37°)
(male)
YS inlet, combo-inlet CL G1/4 9/16-18 JIC (37°)
(male)
A, B spool section G 3/4 1 1/16-12 UN-2B
PC spool section G 1/4 9/16-18 UNF-2B
8
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Item Code Description
12 R Pressure reducing valve with separate safety valve
for internal pilot pressure supply.
13 35 Reduced pressure set to 35 bar
14 S Internal coarse filter for pilot circuit.
15 LS Load-sensing system
16 PA1 Direct operated main pressure relief valve, with
fixed setting.
17 280 Pressure setting for main pressure relief valve
24 MF Fixed counter pressure valve
25 T1 Tank connection open
26 P1 Pump connection open
31 LSPB Load-signal connection for parallel-connected valve
plugged.
32 P2 Pump connection open
34 T3B Tank connection plugged
40 TP Separate tank connection for pilot return
Item Code Description
50 EC Section 1 equipped with proportional electro-
hydraulic remote control
PC Section 2 equipped with proportional hydraulic
remote control
55 0,8 Restrictor in pilot supply line
60 EA Section 1 equipped with spool for single acting
function. Connect to A-port. B-port plugged
D Section 2 equipped with spool for double acting
function.
66 K1 Pressure compensator with built-in check valve
function
67 0,8 Restriction of load signal to compensator.
75 MR With separate feed reducer on motor ports A
and B
76 Y2 Section 1 port A. Service line cavity blocked M-T
X2 Section 1 port B. Service line cavity open M-T
Section 2 ports A and B. Combined port relief and
anti-cavitation valve
The item numbers in the hydraulic circuit diagram and table
below refer to the functions or function groups for which
different options are available. The valve in the example
above is equipped according to the description below. For
other equipment alternatives, see under respective function
[item number] in the catalogue.
55
40
40
50
50
55
76
76
75
75
66
25
26
14
15
16, 17
12, 13
24
66
60
60
67
67
31
34
32
Hydraulic circuit diagram
Hydraulic circuit diagram showing basic functions for K170LS
Shaded zones are functions or function groups to be found further on in the text.
9
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Inlet section [12-29]
The inlet section is equipped with pump (P1) and tank connec-
tions (T1, T2), a connection for the load signal to LS pumps (LS),
a connection for pilot pressure supply for external use (PS), a
gauge point for pump (PX) and load signal pressures (PL). In the
basic variant, the pump connection P1 [26] and tank connection
T1 [25] are open, while the other connections are plugged.
Functions such as maximum pressure relief, copying of the
load signal, pressure reduction for internal pilot-supply, as well as
a pilot filter and counter pressure valves can also be integrated
into the section.
Internal pilot pressure supply [12]
R Pressure reducer for pilot supply.
Internal pilot pressure supply is a valve function, built
into the inlet section, which works as both a pressure
reducer and a pressure relief valve in the pilot circuit. For
safety reasons, the R-cartridge has also been equipped
with a separate safety valve function that prevents the
maximum permissible reduced pressure from being
exceeded. A check valve prevents pilot oil from leaking
back to the pump, and therefore enables the pressure
in the pilot supply circuit to be maintained in the event
of a temporary fall in pump pressure, e.g. during a rapid
lowering movement, to secure pilot supply during pump
pressure drop, we recomend to connect an accumulator
to the PS port.
Pilot pressure for external use, e.g. for delivery to PCL4
hydraulic remote control valves, can be tapped from the
PS connection on the inlet section.
RX Without pressure reducer for pilot supply.
Pilot pressure [13]
The pilot supply pressure can be set at either 35 or 45 bar.
Pilot filter [14]
S Built in strainer for the pilot supply.
Coarse strainer with bypass function in the internal pilot
pressure supply. The strainer protects the pilot circuit
from dirt, especially during start-up of the system.
YS Adapter for connection of external filter for pilot pressure
oil. Enables the pilot circuit to be supplied with cleaner
oil compared with the rest of the system.
See also filtration, page 7.
Internal pilot-pressure
supply R and pilot strainer S
Pressure relief
valve PA1 [16]
Pump connection
P1 [26]
Tank connection
T1 [25]
Counter pressure
valve. Tank connection
T2 [24]
Load signal
copy spool
Gauge port
pump pressure
PX
Load pressure
(not copied)
connection PL
Internal
pilot pressure
supply [12]
Pilot strainer
[14]
Pilot pressure
supply connection
for external use
PS
Load pressure (copied)
connection LS
4
8 12
10
20
30
0
0
40
50
Internal pilot-pressure
supply R and adapter YS.
(Filter is not supplied with valve)
∆p (bar) Internal pilot pressure reducer characteristics
q (l/min)
Inlet Section
10
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Load signal system
The load signal system consists of a number of shuttle valves,
which compare the load signals from different spool sections and
send the highest signal to the connection PL, or to a copying
spool in the inlet section.
The system permits a certain consumption in the load signal line
to the pump, without the load signal level being affected. This
enables simpler system design, with the possibility of installing
logic systems in the LS circuit. Thanks to drainage in the pump
LS regulator, the system gives better winter operating character-
istics with faster response, since the oil in the LS circuit is always
warm. In addition to this, the system prevents disruptive micro-
sinking of the load in the beginning of the lifting phase.
Inlet section type [15]
The inlet section is available in two variants, one for CP systems
and one for systems with LS pumps.
LS Inlet section for systems with LS pump.
The system is equipped with a directly controlled pres-
sure relief valve, PA1[16], which protects the pump and
inlet side of the valve. The LS is always equipped with a
load-signal copy function.
LS3 Inlet section for constant pressure systems.
Same as LS but without load-signal copy function, LS.
A025 Inlet section for un-loading constant pressure systems
(CPU).
CL Combi inlet used as mid-inlet when L90 and K170
are assembled together. This works as ‘adapter plate’
between valves and replaces inlet sections from both
valves.
Pressure relief valve [16]
The inlet section is normally equipped with a pressure relief
valve to protect the pump and valve from pressure peaks in the
system.
PA1 Direct acting port relief valve with very fast opening
sequence and good pressure characteristics. The
replaceable cartridge is factory set. The cartridge has a
make-up function, which means that oil is able to flow
from the tank gallery to the pump gallery in the event of
underpressure in the pump circuit. For setting values,
please see Pressure settings [17].
Y1 Without relief valve.
Plug which can replace the pressure relief valve. The
Y1-plug blocks the connection between the pump and
tank completely.
Pressure relief valve PA1
Without relief valve Y1
D102021
Inlet section type A025 for un-loading constant pressure
systems (CPU).
Inlet Section
11
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Pressure setting [17]
Pressure setting for PA1 [16]
The PA1 direct acting pressure relief valve is delivered
with a fixed setting. The standard settings (in bar) avail-
able are:
Setting pressure in bar: 50, 63, 80, 100, 125, 140, 160,
175, 190, 210, 230, 240, 250, 260, 280, 300, 330.
PA1 needs to be set 20 bar above pump pressure.
See also technical data, page 6-7.
Tank connection T2 [24]
T2B Alternative tank connection T2 plugged. Common
variant.
T2 Alternative tank connection T2 open.
Counter pressure valve
The counter pressure valve, which raises the pressure in the
valve’s tank gallery, is placed in the inlet section. It is available in
two versions: MF with fixed setting and MP with pilot-con trolled
setting.
By raising the counter pressure, the anti-cavitation char-
acteristics of the K170LS are improved still further. This might,
for example, be desirable in situations where make-up flow is
directed into the large side of the cylinder during the lowering of
loads. Good make-up characteristics eliminate the risk of cavita-
tion and reduce the risk of damage to the cylinder seals. They
are also important for functions in which a lowering movement
changes to a lifting movement without a time delay.
The pilot-operated version gives counter pressure only when
it receives a signal. It can be employed in such a way that the
signal to the counter pressure valve is connected only to the
spool-actuator signal(s) controlling the lowering movement(s) that
need extra counter pressure. In this way, unnecessary losses can
be avoided.
MF Counter pressure valve factory set to give 5 bar counter
pressure at a flow of 20 l/min.
MP Pilot operated counter pressure valve for external control
of counter pressure between 0 and 36 bar. Tank connec-
tion T1 [25] must be open and tank connection T3 must
be plugged (T3B [34]).
The MP pilot operated variant only gives a counter
pressure upon receipt of signal. This can be exploited
so that the signal to the counter pressure valve is
connected only to the spool actuating signal(s) control-
ling the lowering movement(s) that need an extra
counter pressure, thus avoiding unnecessary losses.
Max permitted signal pressure is 30 bar. The relation-
ship between pressure and signal is 1.2:1.
Tank connection T1 [25]
T1 Tank connection T1 is open. Common variant.
T1B Tank connection T1 is blocked.
Pump connection P1 [26]
P1 Pump connection P1 is open. Common variant.
P1B Pump connection P1 is plugged.
T1
T1
MP
Counter pressure valve MF
Pilot operated counter pressure valve MP
50
100 150 200
100
0
0
200
300
400
50
100 150 200
8
0
0
16
4
12
∆p (bar) Pressure relief characteristics
∆p (bar) Anti-cavitation characteristics
q (l/min)
q (l/min)
Inlet Section
12
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
D101645
PX
LS
PL
T1
T2B
LSP
TP
T3
P2
P1
PS
Separate tank
connection for
pilot circuit
TP, [40]
Pump connection
P2 [32]
Tank connection
T3 [34]
LS connection [31]
Only with LSP [31]
In the case of parallel connected valves, the PL connection load-
sensing signal in the last valve passes to the LSP connection in
the first valve. The rear valve can be fed with pump oil, by con-
necting P2 and P1.
End section [30 - 44]
The end section is available in two variants, one with all connec-
tions machined and one without machined connections for pump
(P2), and tank (T3).
In the basic variant, the LS connection LSP [31], pump
connection P2 [32] and tank connection T3 [34] are plugged.
In addition to the two standard models, there is a special
adapter plate (AP) which is used when the valve flanges against
an L90LS valve. The adapter plate contains only the pilot tank
connection and through channels which connect the pump, tank,
pilot pump, pilot tank and LS channels of the K170LS and L90LS
valves, respectively. Thus, the pump and tank need only be
connected to the K170LS valve.
The valves are turned so that the adapter plate serves as a
common end plate for the K170LS and L90LS.
End section [30]
US Standard end section.
AP Adapter plate for connection of L90 and K170 together.
Works as the common end plate for both valves.
Choose when APE170 or API170 is specified in L90.
LS-connection [31]
LSP Port open for connection of LS-signal from other valve.
This connection is used to receive the load signal from
a parallel connected valve.
LSPB Port for LS signal from other valve plugged. LS signal is
internally drained.
Pump connection P2 [32]
P2 Alternative pump connection in rear face.
The connection can, for example, be used to feed
valves located to the rear, or for double feeding of the
valve in applications where many functions with very
high flow demands are operated simultaneously. The
connection can also be used in situations where feeding
from the rear face is the most suitable option in terms of
space available.
P2B Alternative pump connection plugged. Common variant.
Tank connection T3 [34]
T3 Tank connection T3 is open.
T3B Tank connection T3 is plugged. Common variant.
Separate tank connection for the pilot circuit [40]
TP Separate tank connection for the pilot circuit is open.
The connection to the main tank gallery of the direc-
tional valve is blocked in the inlet section. The function
is recomended for systems in which there is a risk of
dynamic pressure fluctuations in the tank line, which
cause fluctuations in the pilot circuit when there is a
common tank line.
NB! TP connection can not be plugged.
/ Not prepared for separate pilot return.
End Section
13
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Spool section [45-89]
The K170LS directional valve is stackable and can be delivered
in combinations of 1 to 9 spool sections. Each section can be
equipped individually with a large number of optional functions,
spools and spool actuators for optimum adaptation to the appli-
cation and controlled function.
Material design [48]
S Spool section in nodular-iron design, (Max 330 bar in
pump port and max 350 bar in service port).
Spool section with actuator type PC
Spool actuator [50]
Damping of
pressure
compensator
[67]
Port relief valve, Port A [76A]
Spool actuator [50]
Spool [69]
Pressure
compensator [66]
Port relief valve, Port B [76B]
Feed reduction P-B [75B]
Feed reduction P-A [75A]
Spool Section
14
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Spool actuators [50]
PC, PCH - Hydraulic spool actuator
PC Hydraulic spool actuation.
PCH Hydraulic spool actuation with manual operation.
The PC and PCH are proportional, hydraulically
controlled spool actuators with spring centring to the
neutral position. They are intended to be hydraulicly
remote controlled by PCL4.
When choosing a control pressure for the PCL4, its
starting pressure should be approx. 1 bar lower than that
of the directional valve, in order to ensure gentle starting
and stopping. The pilot pressure for the control pressure
valve can connected to the PS port for the internal pilot
pressure supply in the inlet section of the directional
valve.
PC Control pressure, breakaway* 5.6 bar
Control pressure, final* 20.5 bar
PCH Control pressure, breakaway* 5 bar
Control pressure, final* 21 bar
Permissible pressure in
pilot cap max. 50 bar
Connections: G1/4 or 9/16-18 UNF
PC, PCH Hydraulic spool actuators
PCH
PC
Connection for
pilot pressure
P-B, A-T
Connection for
pilot pressure
P-A, B-T
Alt. connection
P-A, B-T
Alt. connection
P-A, B-T
PCH
PC
Stroke length limitation
P-A, B-T Qset A [72]
Stroke length
limitation P-B,
A-T Qset B [72]
PCH, PC
Stroke length
limitation P-B,
A-T Qset B [72]
Air bleeder
*
The breakaway pressure is the pressure needed for the direc-
tional valve to open the connection “pump to service port”.
The final pressure is the lowest pressure needed to effect full
actuation of a spool in the directional valve. This 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.
Spool Section
15
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Electro-hydraulic proportional spool actuator
EC/ECS Electro-hydraulic spool actuator
The EC/ECS are proportional, electro-hydraulically
controlled spool actuators with spring centering to
neutral. They are intended to be controlled remotely by
the IQAN control systems. Pilot-pressure oil is led to the
spool actuators through internal ducts in the directional
valve. This means that only the electric cables from the
control system to the pilot solenoid valve needs to be
connected externally.
Control current for 12 V
Breakaway* min. 570 mA
Fully actuated max. 1250 mA
Control current for 24V
Breakaway* min. 290 mA
Fully actuated max. 650 mA
The control current must be regulated for temperature
compensation and with ripple to minimise hysteresis.
Measuring connections: G1/4 or 9/16-18 UNF
EC as ECS but with manual over-ride and air-bleed
screw in the pilot solenoid valve.
EC/ECS, ECH Electro-hydraulic spool actuator
ECH Electro-hydraulic spool actuator with lever for
direct control
The ECH spool actuator can be operated directly and
steplessly by a supplementary local lever (optional).
Other data as for ECS to the left.
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.
*
The breakaway current refers to the current needed for the direc-
tional valve to open the connection “pump to service 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
consideration 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.
ECH
ECH
EC/ECS
EC/ECS
ECH
EC/ECS
Gauge port
Control P-A, B-T
Control P-B, A-T
Spool Section
16
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Pilot restrictor [55 A,B]
To give gentle remote control, the EC, ECS, ECH, PC and PCH
spool actuators are fitted with pilot restrictors, which can be
chosen individually for each service port. The restrictor gives a
kind of ramp function.
For the EC, ECS and ECH, the following options are
available:
/ Without pilot restrictor
0.45 0.45 mm pilot restrictor
0.6 0.6 mm pilot restrictor
0.7 0.7 mm pilot restrictor
0.8 0.8 mm pilot restrictor (Normal)
0.9 0.9 mm pilot restrictor
1.0 1.0 mm pilot restrictor
1.1 1.1 mm pilot restrictor
1.2 1.2 mm pilot restrictor
1.3 1.3 mm pilot restrictor
1.4 1.4 mm pilot restrictor
1.5 1.5 mm pilot restrictor
For PC, PCH the following options are available:
/ Without pilot restrictor (Normal)
0.6 0.6 mm pilot restrictor
0.8 0.8 mm pilot restrictor
0.9 0.9 mm pilot restrictor
1.0 1.0 mm pilot restrictor
1.1 1.1 mm pilot restrictor
1.2 1.2 mm pilot restrictor
1.3 1.3 mm pilot restrictor
1.4 1.4 mm pilot restrictor
1.5 1.5 mm pilot restrictor
B
A
Pilot restrictor for EC andECH spool actuators
Spool Section
17
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Spool selection [60-74]
Spool options
The spool is the most important link between the operator’s acti-
vation of a lever unit and the movement of the controlled function.
For this reason, Parker makes a wide range of standard spools to
meet many different function-specific demands. Spool selection
is effected with the aid of a computerized specification program,
using a series of different parameters to determine the optimum
spool for the job.
Spool function [60]
There are many spool variants which are adapted for different
flows, load conditions and actuator area ratios. The spools are
also available with different degrees of force feedback from the
service ports A and/or B.
D Double-acting spool for, e.g. double-acting cylinders.
Blocked in the neutral position.
Dm Double-acting spool with drainage of service ports A
and B to tank, which prevents pressure build up in the
neutral position. The spool is used as a double spool in
combination with a double over-centre valve.
Da Double-acting spool with drainage of service port A to
tank, which prevents pressure build up in service port A
in the neutral position.
Db Double-acting spool with drainage of service port B to
tank, which prevents pressure build up in service port B
in the neutral position.
EA Single-action spool for, e.g. single-acting cylinder.
Blocked in neutral position. Service port B blocked.
EA3 Single-acting spool for, e.g. single-acting cylinders.
Blocked in neutral position. Service port B blocked
during lifting function. Lowering function at both service
ports A and B.
EB Single-acting spool for, e.g. single-acting cylinders.
Blocked in neutral position. Service port A blocked.
M Double-acting spool for, e.g. hydraulic motors. Floating
function in neutral position.
MA Double-acting spool for, e.g. hydraulic motors. Floating
function in neutral position, service port A to Tank.
MB Double-acting spool for, e.g. hydraulic motors. Floating
function in neutral position, service port B to Tank.
CB Regenerative spool for rapid feeding of cylinder
via service port B. The large side of the cylinder is
connected to service port B.
Flow requirement [61 A,B]
The K170LS directional valve has a range of optimized spool
design s for nominal flows up to 170 l/min when the section is
equipped with an individual pressure compensator, K1 [66]. See
“Pressure compensator and/or load-hold check valve [66]” for flow
with other compensators.
Without an individual pressure compensator, flows up to
220 l/min are obtainable, depending on the pre-set regulating
difference in the LS pump.
The desired flow to the service ports A and B is entered in
the ordering documentation. Parker’s computerized specification
system then selects spools to give at least the flow required, also
taking other parameters into account.
The maximum flow is then set by limiting the spool stroke
by means of adjustment screws on the spool actuator or, in the
case of electro-hydraulic remote control, by setting the maximum
current.
See “Flow settings” [72] for details on factory setting of
maximum flow.
1
2
3
4
5
6
7
80
0
40
15
30
80
60
120
110
160
170
200
220
240
q (l/min) Flow rate in service connection
Spool stroke (mm)
Typical curves showing flow as a function of spool stroke
D
Dm
Da
Db
M
MA
MB
EA
EA3
EB
CB
Spool Section
18
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Area relationship [62]
The area relationship for a section is calculated by dividing the
cylinder area that is connected to the service port B by the area
that is connected to the service port A. When the larger side of
the cylinder is connected to the service port A, the relationship is
less than 1. The area relationship for a motor is 1.
Flow rate in % Optional force feedback
Load characteristics [63]
The character of the load can be selected according to five typical
cases. This information is entered so that the spool can be given
the best possible adaptation to the intended application.
LAB Lift load can change between service ports A and B.
LA Lift load normally on service port A only.
LB Lift load normally on service port B only.
LN No or low lift load on service ports A and B.
S Slewing function.
Force feedback [64 A,B]
The K170LS is available with a force-feedback option, which
enables the positive sense of force control from CFO systems to
be transmitted to LS systems, thus enabling force-control char-
acteristics to be incorporated in individual valve sections. With
force control, the operator is better able to sense the increase in
machine load when a hard obstacle is met, e.g. in digging opera-
tions.
Force feed-back also gives a kind of ramp function, which results
in more gentle transitions during speed changes. This in turn
has a stabilizing effect on the hydraulic system, and the machine
operating characteristics become smoother. Both these charac-
teristics are important, especially for slewing functions and similar
movements. With force feedback, machine wear is reduced and
efficiency increases.
The section can be equipped with force feedback for the service
ports A and B individually. The degree of force feedback can be
chosen from three levels. The higher the level of force feedback,
the greater the reduction in the function’s speed upon increasing
resistance for the same lever stroke. It follows from this that the
lever must be moved further in order for the speed to remain the
same when the load is increasing.
/ No force feedback
FN Normal level of force feedback
FH High level of force feedback
FL Low level of force feedback
LAB - Load can change between the A- and B-port.
LB - Load normally on B- port only.
LA - Load normally on A- port only.
25
50
75
100
100
0
75
50
25
0
Lever stroke in %
Force feedback
Light
load
Havy
load
Spool Section
19
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Pressure compensators
The primary purpose of pressure compensation is to maintain a
constant flow rate to a function, regardless of pressure variations
in the system. The facility is of special value in lifting functions.
Excellent simultaneous operation characteristics
In cases where several machine functions are operated simul-
taneously, the spool sections in the K170LS can be equipped
with individual, integrated pressure compensators. Subject to
available pump capacity, sections so equipped will deliver the
pre-determined constant flow regardless of other simultaneously
operated functions, and regardless of variations in load or feed
pressure. Parker integrated pressure compensators have a very
quick response time and incorporate built-in load-hold check
valves.
Increased or reduced function speed where required
To meet demands for exact speed in certain functions, Parker
integrated pressure compensators comes in a number of fixed
variants that give flow rates from nominal to +55% through
the selfsame spool (see K1 to KN1 below). To accommodate
changing operating conditions, a variant that can be adjusted
on site to give ±20% of nominal flow is also available (see KS
below).
K1 Fixed pressure compensator with load-hold check valve.
The spool gives nominal flow.
K2 Fixed pressure compensator with load-hold check valve.
The spool gives 20% more than nominal flow.
K3 Fixed pressure compensator with load-hold check valve.
The spool gives 55% more than nominal flow.
N.B. Pump must deliver a pressure of at least ∆p=30
bar. (30 bar above load signal reported to pump regu-
lator.)
KN1 Fixed pressure compensator with extra fast load-hold
check valve. The spool gives 15% more than nominal
flow.
KS Adjustable pressure compensator with load-hold check
valve. The spool gives ±20% of nominal flow.
N1 Load-hold check valve.
X1 Prepared for compensator and load-hold check valve.
q (l/min) Flow rate curves
Load pressure (bar)
Load independent flow with pressure compensator
D101648
100
200 300
40
80
120
0
0
160
200
Pressure compensator for constant flow in service port (KN1).
Pressure compensator and/or load-hold
check valve
[66]
Spool Section
20
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Damping of pressure compensator [67]
The load-signal restrictor affects the response of the pressure
compensator.
0.6 Alternative LS restrictor for comp. ∅0.6 mm
0.8 Recommended LS restrictor for comp. ∅0.8 mm
1.0 Alternative LS restrictor for comp. ∅1.0 mm
Spool designation [69]
The task of spool selection can be submitted to Parker’s compu-
terized specification program, which adapts the spool to match
the specific demands of each function, thus optimizing the spool.
The information given at positions 61, 62, 63, 64 and 66
therefore makes up part of the basis for the choice of spool.
Flow settings [72]
With PC and PCH spool actuators, flow limitation over the spool
to motor ports A and B can be effected by means of mechanical
limitation of the spool stroke length.
Qset When the spool section is equipped with a PC or PCH
spool actuator, it can be delivered with a factory-set
maximum flow rate. Setting is carried out according to
the stated flow requirements to the A-and B-ports
[61 A, B].
Qset A When the spool section is equipped with a PC or PCH
spool actuator, it can be delivered with a factory-set
maximum flow rate. Setting is carried out according to
the stated flow requirements to the A-ports [61 A].
Qset B When the spool section is equipped with a PC or PCH
spool actuator, it can be delivered with a factory-set
maximum flow rate. Setting is carried out according to
the stated flow requirements to the B-ports [61B].
When setting the flow rates for sections without pressure
compensators in systems with LS pumps, the flow setting is
made with a ∆p of 20 bar between the pump pressure in PX and
the load signal in PL, at full flow take-up. For details on setting
the flow for PC spool actuators, see page 14.
Feed reduction valves [75]
Any section in the K170LS valve can be equipped with individual
feed reducing valves for the service ports A and B. These are
used for those functions in the system which require a lower
maximum pressure than the normal operating pressure of the
system. The reducing valve is infinitely adjustable between 30
and 330 bar. It serves to reduce the pump pressure so that the
feed pressure in the section in which it is fitted does not exceed
the pre-set value.
The use of feed reducing valves enables the pressure to be
limited without using any more than a pilot flow (<2 l/min).
In the case of feed reduction, the section must be fitted with
a pressure compensator. Since the feed reducing valve is a
two-way valve, pressure shocks that arise after the feed reducing
valve must be limited with the aid of a port relief valve. The pres-
sure setting on the port relief valve [76 A,B] can be set as low as
10 bar above reducer setting.
Setting of feed reduction in the A-port [75A]
Setting values for the A-port are from 30 to 330 bar.
Setting of feed reduction in the B-port [75B]
Setting values for the B-port are from 30 to 330 bar.
P
red
(bar) Reducer characteristics
50
100 150 200
100
0
0
200
300
q
m
(l/min)
P
red
= Reduced pressure
q
m
= Flow at service port
Restrictor for damping of pressure compensator.
D101648b
Spool Section
21
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
Port relief and/or anti-cavitation valves [76 A,B]
A specially designed cartridge valve is used as a port relief and
anti-cavitation valve, PA, in the service ports. Its function is to
protect the valve and consumer from pressure peaks and exces-
sive pressure in the system. The very rapid opening sequence
and good pressure characteristics make the cartridge valve an
excellent port relief valve. The anti-cavitation valve causes oil to
flow from the tank gallery to the service port side in the event of
under-pressure in the service ports.
Separate anti-cavitation valve in service ports
As an alternative to the port relief valve, the service ports can
be fitted with anti-cavitation check valves. These enable oil to
flow from the tank gallery to the service port side in the event of
under-pressure.
The connection between tank and service port can also be
blocked using an Y2-plug.
Anti cavitation characteristics
The curve shows the pressure drop between tank connection
and service port when the PA or N2 cartridge is used as an
anti-cavitation valve.
X2 Service port open to tank.
Y2 Service port blocked to tank with plug.
N2 Service ports of section equipped with anti-cavitation
valve.
50-350 Standard pressure settings for port relief valves (PA) in
bar:
50, 63, 80, 100, 125, 140, 160, 175, 190, 210, 230,
240, 250, 260, 270, 280, 300, 310, 320, 330 and 350.
The pressure setting on the port relief valve can be set as low as
10 bar above reducer setting. [75 A, B].
50
100 150 200
100
0
0
200
300
400
50
100 150 200
8
0
0
16
4
12
∆p (bar) Pressure relief characteristics
∆p (bar) Anti-cavitation characteristics with PA or N2
q (l/min)
q (l/min)
Port B is equipped with a
combined port relief valve and
anti-cavitation valve. (PA) Port
A is equipped with an anti-
cavitation valve (N2).
Port B is open to tank (X2)
and port A has no tank
connection (Y2).
Spool Section
22
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
This block, like most of our function blocks, is built up using
standard cartridge valves. Only the block itself is unique.
Function block [90-99]
The K170LS can be equipped with function blocks (manifolds)
that enables complete system solutions to be integrated into the
valve.
Please contact Parker for more details on integrated system
solutions. In addition to standard blocks, Parker’s custom-builds
function blocks to meet special system demands.
Below is an example of a specially designed function block
for a specific customer.
Spool Section
Accessories
Connectors, levers, etc. are available as accessories.
They must be ordered separately.
See our Mobile Valves Accessories catalogue
(HY17-8558/UK).
23
Parker Hannifin
Mobile Controls Division Europe
Borås, Sweden
Mobile Directional Control Valve
K170LS
Catalogue HY17-8557/UK
L
PC b)
B
D101652
(3.90)
(2.54)
(2.42)
(1.46)
(4.37)
(0.65)
(3.50)
(5.04)
99 PC
a)
A
64,5
61,5 PC b)
B
37
16,5
89
128
111 (LSP
, T
3)
190
(7.48)
0,5
(0.02)
135,5
(5.33)
43,5
(1.71)
(2.37)
(2.07)
62,7 (T2, MP
(2.47)
60,2 (P1, T1)
52,7 (YS)
)
86
(50)
(3.39)
((1.97))
12 PC a)
A
(0.47)
max 18,5
(0.73)
max 18,5
(0.73)
44,5 (LSP)
(1.75)
47
(1.85)
151 (2x)
(5.94)
36
(1.42)
96
(3.78)
267,5
(10.53)
350
(13.78)
134
(5.28)
55
(2.17)
30
(1.18)
163
(6.42)
177,5
(6.99)
117
(4.61)
103,5 (T2, MP
)
(4.07)
48
(1.89)
39,5 (YS)
(1.56)
No. of L L
Sections mm inch
1 200 7.87
2 250 9.84
3 300 11.81
4 350 13.78
5 400 15.75
6 450 17.72
7 500 19.69
8 550 21.65
9 600 23.62
a) Pilot-pressure connection PC
A
activates service port A
b) Pilot-pressure connection PC
B
activates service port B
(inch)
Dimensional drawing
E
© 2010 Parker Hannin Corporation. All rights reserved. Catalogue HY17-8557/UK, POD, 11/2010, ZZ
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Tel: +90 216 4997081
parker.turkey@parker.com
UA – Ukraine, Kiev
Tel +380 44 494 2731
parker.ukraine@parker.com
UK – United Kingdom, Warwick
Tel: +44 (0)1926 317 878
parker.uk@parker.com
ZA – South Africa, Kempton Park
Tel: +27 (0)11 961 0700
parker.southafrica@parker.com
North America
CA – Canada, Milton, Ontario
Tel: +1 905 693 3000
US – USA, Cleveland
(industrial)
Tel: +1 216 896 3000
US – USA, Elk Grove Village
(mobile)
Tel: +1 847 258 6200
Asia Pacific
AU – Australia, Castle Hill
Tel: +61 (0)2-9634 7777
CN – China, Shanghai
Tel: +86 21 2899 5000
HK – Hong Kong
Tel: +852 2428 8008
IN – India, Mumbai
Tel: +91 22 6513 7081-85
JP – Japan, Fujisawa
Tel: +81 (0)4 6635 3050
KR – South Korea, Seoul
Tel: +82 2 559 0400
MY – Malaysia, Shah Alam
Tel: +60 3 7849 0800
NZ – New Zealand, Mt Wellington
Tel: +64 9 574 1744
SG – Singapore
Tel: +65 6887 6300
TH – Thailand, Bangkok
Tel: +662 717 8140
TW – Taiwan, Taipei
Tel: +886 2 2298 8987
South America
AR – Argentina, Buenos Aires
Tel: +54 3327 44 4129
BR – Brazil, Sao Jose dos
Campos
Tel: +55 12 4009 3500
CL – Chile, Santiago
Tel: +56 2 623 1216
MX – Mexico, Apodaca
Tel: +52 81 8156 6000
VE – Venezuela, Caracas
Tel: +58 212 238 5422
