Proportional directional spool valve type EDL

Product documentation

D 8086

07-2018-2.1

Series connection

Operating pressure p

max

Flow rate V

max

320 bar

48 lpm

2/34 D 8086 - 07-2018-2.1

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authorisation is prohibited.

Offenders will be held liable for the payment of damages.

Brand names, product names and trademarks are not specifically indicated. In particular with regard to registered and protected names

and trademarks, usage is subject to legal provisions.

HAWE Hydraulik respects these legal provisions in all cases.

Printing date / document generated on: 18.07.2018

D 8086 - 07-2018-2.1 3/34

Contents

1 Overview of proportional directional spool valve type EDL.................................................................................... 4

2 Available versions, main data............................................................................................................................. 5

2.1 Order coding, overview......................................................................................................................................... 5

2.2 Connection blocks and end plates.......................................................................................................................... 6

2.2.1 Connection blocks................................................................................................................................................ 6

2.2.2 End plates...........................................................................................................................................................8

2.3 Valve section.......................................................................................................................................................9

2.3.1 Directional valve..................................................................................................................................................9

2.3.2 Series intermediate plates................................................................................................................................... 14

3 Parameters....................................................................................................................................................... 15

3.1 General and hydraulic......................................................................................................................................... 15

3.2 Characteristics....................................................................................................................................................17

3.3 Actuations......................................................................................................................................................... 19

4 Dimensions...................................................................................................................................................... 21

4.1 Connection blocks.............................................................................................................................................. 21

4.2 Valve sections....................................................................................................................................................23

5 Assembly, operation and maintenance recommendations.....................................................................................26

5.1 Intended use..................................................................................................................................................... 26

5.2 Note regarding assembly, installation and conversion..............................................................................................27

5.2.1 Mounting...........................................................................................................................................................27

5.2.2 Piping...............................................................................................................................................................27

5.2.3 Seal kits............................................................................................................................................................27

5.3 Operating instructions.........................................................................................................................................28

5.4 Maintenance information.....................................................................................................................................28

6 Other information.............................................................................................................................................29

6.1 Notes for selection and lay-out............................................................................................................................29

6.2 Circuit examples.................................................................................................................................................31

4/34 D 8086 - 07-2018-2.1

Overview of proportional directional spool valve type EDL

Proportional directional spool valves are a type of directional valve. They control

the direction of movement and the velocity of individual or multiple hydraulic

consumers actuated simultaneously. Control is independent of the load and

continuous.

The directional spool valve type EDL with series connection is actuated directly.

The ow rates for the individual consumers can be individually adjusted. The

proportional directional spool valve can be exibly adapted to different control

tasks by means of additional functions in the intermediate plates and ancillary

blocks.

The directional spool valve type EDL can be combined directly with the

proportional directional spool valve type PSL and PSV in size 2 and is therefore

suitable for constant and variable pump systems. It is used in mobile hydraulics,

in particular in civil engineering and agricultural engineering.

Features and benets:

■

One valve for different control functions and small ow quantities

■

Energy-saving closed-centre systems

■

Compact and lightweight design

■

Modular system can be directly combined with type PSL/PSV-2

Intended applications:

■

Construction and construction materials machinery

■

Cranes and lifting equipment

■

Machines for forestry and agricultural purposes

■

Municipal trucks

Proportional directional spool valve type EDL

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Available versions, main data

2.1 Order coding, overview

Order coding example:

PSV 3X B6 -2 -DA

-DA

25/16

40/25 C ... X W3

/EI

/2 AN300 BN350 -E0 -G 24

Solenoid voltage Table 11 Solenoid

voltage and

solenoid version

End plates Table 3 End plates

Ancillary blocks Table 12 Ancillary blocks (selection)

Table 12a Intermediate plates (selection)

Actuation types Table 10 Actuation types

Shuttle valve Table 9 Shuttle valve

LS pressure limitation Table 8 LS pressure limitation

Flow rates

Table 7 Maximum ow rates P d A(B)

Table 7a Combination of ow rates

Circuit symbols Table 6 Circuit symbols

Inow controller Table 5 Inow controller

Directional valve, basic block Table 4 Basic block

Size

Additional elements Table 2 Additional elements

Connection blocks Table 1 Connection blocks

A maximum of 10 directional spool valves can be switched in series in one or more valve manifold(s) via the internal LS line. If more are

required, external wiring must be provided (see note in Chapter 6, "Other information" ("Combination of more than 10 directional spool

valves")).

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2.2 Connection blocks and end plates

There are the following basic variants of connection blocks:

■

Connection blocks with integrated 3-way controller when using a constant pump system (open centre) – type PSL

■

Connection blocks for use with variable pump systems (closed centre), constant pressure systems or for parallel oil supply of

multiple physically separate directional spool valve banks in the second and all further valve blocks – type PSV

■

Adapter plates for combining proportional directional spool valves type PSL and PSV, size 3 and 5

Order coding of a single connection block (example):

PSV 3X - 2

Note

The size specification is essential. Here: -2

2.2.1 Connection blocks

Order coding example:

PSV 3X B . - 2 -...- E1

Size

Additional element Table 2 Additional elements

Connection blocks Table 1 Connection blocks

Table 1 Connection blocks

Coding Port Description

PSV 3X-2 G 1/2 (BSPP) Connection blocks for variable pump

PSV 3X B.-2 G 1/2 (BSPP) Connection blocks for variable pump with orice additional element, see Table 2

PSV E0 --

Initial plate without separate ports. Can only be used in combination with the middle input

block ZPL 22 P6R6, see Chapter 2.3.2, "Series intermediate plates"

Operating pressure max = 250 bar!

PSL 3 .. G 1/2 (BSPP)

PSL UNF 2.. SAE-8 (3/4-16 UNF-2B)

Connection blocks for constant pumps, (see D 7700-2)

PSV 3 .. G 1/2 (BSPP)

PSV UNF 2.. 3/4-16 UNF-2B

Connection blocks for variable pump, (see D 7700-2)

ZPL 32

ZPL 52

Adapter plate for combining proportional directional spool valve type PSL and PSV size 3

(see D 7700-3) or size 5 (see D 7700-5)

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Circuit symbols

PSV 3X-2 PSV 3X B.-2 PSV E0-2

Table 2 Additional elements

(For notes and explanation, see Chapter 6, "Other information" ("On connection blocks"))

Additional elements only suitable where variable pumps are used (limitation of the control oil ow).

Coding Description

No designation Standard, without additional element

B 4, B 5, B 6,

B 7, B 8

Orice # 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm in the LS gallery (for control oil limitation)

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2.2.2 End plates

Order coding example:

PSV 3 X - 2 - DA 2 L25/25/E/2 - E 0 - G 24

End plates Table 3 End plates

Table 3 End plates

Coding Port Description Circuit symbol

E 0 -- End plate without additional function,

not in combination with valve sections SL2, SL3 or SL5

•

Can only be used with max. three sections

•

Only in conjunction with shuttle valve, coding W 3, Table 9 in

last valve section

Operating pressure max = 250 bar!

E 1

E 1 UNF

G 1/4 (BSPP)

SAE-4 (7/16-20 UNF-2B)

With control oil return line T external to tank

E 2

E 2 UNF

G 1/4 (BSPP)

SAE-4 (7/16-20 UNF-2B)

Like E 1, with additional port Y for connection to the LS outlet of

another, separately arranged PSV spool block

E 4

E 4 UNF

G 1/4 (BSPP)

SAE-4 (7/16-20 UNF-2B)

Like E 1, however control oil return line is internal, maximum return

pressure of 10bar!

E 5

E 5 UNF

G 1/4 (BSPP)

SAE-4 (7/16-20 UNF-2B)

Like E 2, however control oil return line is internal, maximum return

pressure of 10bar!

Note

•

Details for end plates E 1, E 1 UNF, E 2, E 2 UNF, E 4, E 4 UNF, E 5, E 5 UNF see D 7700-2

•

All end plates of the proportional directional spool valve type PSL and PSV size 2 can be used (see D 7700-2)

D 8086 - 07-2018-2.1 9/34

2.3 Valve section

2.3.1 Directional valve

Order coding example:

PSV 31/D250 - 2 - DA 2 L 25/40 C 150 X /E /2 - E1 - G 24

Ancillary blocks Table 12 Ancillary blocks (selection)

Table 12a Intermediate plates (selection)

Actuation types Table 10 Actuation types

LS pressure limitation Table 8 LS pressure limitation

Flow rates

Table 7 Maximum ow rates P d A(B)

Table 7a Combination of ow rates

Circuit symbols Table 6 Circuit symbols

Inow controller Table 5 Inow controller

Directional valve, basic block Table 4 Basic block

Order coding of the single valve section (examples): Valve section

Valve spool (single)

EDL 2 - DA2 L 25/40/EI-G 24

EDL 2 - L 25/40

Note

■

The size specification is essential. Here: EDL 2.

■

The valve spools are subsequently interchangeable, e.g. if a different ow rating than initially planned becomes necessary.

10/34 D 8086 - 07-2018-2.1

Table 4 Basic block

Coding Description

DA Complete valve section with an ancillary block in accordance with Table 12 D 7700-2

Circuit symbol

With respect to main ow and actuation, the circuit symbols are neutral and must be supplemented by the corresponding circuit

symbols given according to Table 6 to 10, Chapter 6, see also examples in Table 10

4/3-way directional spool valve with inow controller

Example: - DA 7 H40/40/E/2 (-DT 12)

4/3-way directional spool valve with inow controller and LS

pressure limitation

Example: - DA 2 L25/16 C 200 /E/2 (- X 24)

1 Ancillary block and intermediate block acc. to D 7700-2

Table 5 Inow controller

Coding Description

2 Standard, with inow controller, for simultaneous load-compensated moving of several consumers (4/3-way directional

spool valve, standard version, control pressure approx. 5 bar)

7 With inow controller (for circuit symbol, see coding 2) but with reinforced 2-way control spring (control pressure

approx. 9 bar).

Only usable in conjunction with connection blocks type PSV or the middle input block type ZPL 22 P6R6, see Chapter 6,

"Other information"

R 2

R 7

Like coding 2, 7 but with additional check valve function (spool valve = slight leakage)

Only usable in conjunction with connection blocks type PSL.H../... (only DA R 2) or type PSV or the middle input block

type ZPL 22 P6R6, see Chapter 6, "Other information"

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Table 6 Circuit symbols

L H

Table 7 Maximum ow rates P d A(B) in accordance with coding

Coding for ow rate Q

A, B

(lpm)

at consumer ports A and B

Coding for spool

valve

acc. to Table 6

3 6 10 16 25 40

2 3 6 10 16 25 40

7 4 7 12 19 29 48

Note

■

The specied nominal ow rates correspond to the set values for E actuation.

For EI actuation, the max. ow rates can be higher.

■

The maximum reux ow rate must not exceed 80lpm.

■

The ow rates for the consumer ports A and B can be selected in accordance with Table 7a, e.g. 40/25, 16/16. This enables

optimal adaptation to the respective consumer while exploiting the full functional lift. In addition, there is the possibility of

stroke limitation.

Table 7a Combination of ow rates

Consumer port BCoding L

3 6 10 16 25 40

o o

o o o

o o

o o o

Consumer port A

o o

Consumer port BCoding H

3 6 10 16 25 40

o o

o o o

o o

Consumer port A

o o o

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Table 8 LS pressure limitation

Coding Description Circuit symbol

No designation Without protection --

C ... X Joint LS pressure limitation for A and B with pressure specification and load pressure,

signal output G 1/8 (BSPP), only in conjunction with solenoid version coding AMP.. and

DT.. (Table 11)

Order coding example:

DA 2 L 25/16 W 3 /E/2 - G24

Shuttle valve Table 9 Shuttle valve

Table 9 Shuttle valve

Coding Description Circuit symbol

No designation Shuttle valve in LS gallery

W 3 Without shuttle valve,

e.g. in last valve section for combination with end plate coding E 0

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Table 10 Actuation types

Coding Description Circuit symbol

E Electrical actuation with stroke limitation

EI Electrical actuation with manual override

AEI Electrical actuation with manual override, A-side only

BEI Electrical actuation with manual override, B-side only

Note

■

For reference values for start of ow at A or B (= min.) up to max. usable volume ow in accordance with Table 7, see

Chapter 3.2, "Characteristics"

■

The solenoid voltage and solenoid version are dened at the end of the type designation and applies to all solenoids in the

valve bank, see Table 11

Table 11 Solenoid voltage and solenoid version

Coding Electrical connection Nominal voltage Protection class

(IEC 60529)

X 12

X 24

DIN EN 175 301-803 A

(Coding G.. with line connector, coding L.. with LED plug)

12 V DC

24 V DC

IP 65

AMP 12

AMP 24

AMP Junior Timer 12 V DC

24 V DC

IP 65

DT 12

DT 24

DEUTSCH (DT 04-2P) 12 V DC

24 V DC

IP 69 K

14/34 D 8086 - 07-2018-2.1

The EDL valve sections can be freely combined with all ancillary blocks and intermediate plates (parallel connection) type PSL and PSV,

size 2. For a detailed overview of the available variants, see D 7700-2

Table 12 Ancillary blocks (selection)

Coding Port Description

/UNF 2

G 3/8 (BSPP)

G 1/2 (BSPP)

SAE-...

Ancillary blocks without additional functions

/2 AS.. BS.. G 3/8 (BSPP) Ancillary blocks with shock valves at A and B (mutual spraying), with pressure specifica-

tion (bar)

/2 AN... BN...

/UNF 2 AN.. BN..

G 3/8 (BSPP)

SAE

Ancillary blocks with shock and servo-suction valves at A and B, with pressure specifica-

tion (bar)

/2 AL.. BL..

/UNF 2 AL.. BL..

Ancillary blocks with load-holding valves at A and B, with pressure specification (bar)

Table 12a Intermediate plates (selection)

Coding Description

/ZDR

/ZDS

Short-circuit valve between A and B

/ZAL.. BL.. Intermediate plates with load-holding valves at A and B, with pressure specification (bar)

/ZDRH Intermediate plates with releasable check valves

/Z 40 Spacer plate

2.3.2 Series intermediate plates

Coding Port (ISO 228-1) (BSPP)

P, R

Description Circuit symbol

ZPL 22 P6R6 G 1 1/4 Middle input block for installation of EDL 2 sections on both sides.

Hydraulic oil supply via variable pump with load-sensing controller,

as 2nd separate block or for constant pressure systems.

Only possible in combination with initial plate PSV E0 - 2 (see

Chapter 2.2.1, "Connection blocks", Table 1)

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Parameters

3.1 General and hydraulic

General information

Description Proportional directional spool valve EDL

Design Spool valve, valve bank, up to 10 valve sections, all-steel version

Material Steel; nitrided valve housing, hardened and ground functional inner parts

Surface treatment (solenoid): DIN 50979-Fe ZnNi 8

Mounting Valve bank M8, see Chapter 4, "Dimensions"

Installation position As desired

Ports

P Hydraulic oil inlets (pump) or lead-on

R Return lines

A, B Consumer ports

LS Load-signal outlet, e.g. port for pump controller on PSV

Note

No pressure inlet.

M Pressure gauge port (pump side)

Z Pilot pressure connection

(inlet: 20...40 bar; outlet: 20 or 40 bar)

T Control oil tank line

Y Load-signal inlet (end plates E 2, E 5, E 18, E 18 UNF, E 20 and E 20

UNF)

Hydraulic uid Hydraulic oil: according to part 1 to 3;

ISO VG 10 to 68 according to DIN ISO 3448

Viscosity limits: min. approx. 4, max. approx. 1500 mm

opt. operation approx. 10... 500 mm

/s.

Also suitable for biologically degradable hydraulic uids type HEPG (polyalkylene glycol)

and HEES (synthetic ester) at operating temperatures up to approx. +70°C.

Recommended cleanliness level

ISO 4406

20/17/14...18/15/12

Temperatures Environment: -40 ... +50°C, oil: -25 ... +80°C, pay attention to the viscosity range.

Start temperature: down to -40°C is permissible (observe start viscosities!), as long as the

steady-state temperature is at least 20K higher for subsequent operation.

Biologically degradable pressure uids: Note manufacturer specifications. With consideration

for the seal compatibility, not above +70°C.

Note

Note restrictions on explosion-proof solenoid.

16/34 D 8086 - 07-2018-2.1

Pressure and volumetric ow

Operating pressure

■

max

= 320 bar; ports P, A, B, LS, M, Y

■

The pressure achievable at the consumer side of the directional spool valves is lower

by the amount of the internal control pressure drop at the 3-way controller PSL (see

characteristic curve) or at the pump controller (PSV).

■

Return connection R(R1) ≤ 50 bar

Volumetric ow Max. consumer ow rates accordingly, see Chapter 2.3.1, "Directional valve", Table 7

Weight

Connection block Type

PSV 3X-2, PSV 3X.-2 = 1.7 kg

PSV E0-2 = 0.3 kg

For other connection blocks, see D 7700-2

Valve section DA.. E, EI = 2.5 kg

DA.. AE, AEI, BE, BEI = 1.9 kg

For other ancillary blocks, see D 7700-2

End plate (EDL 2-) E 0 = 0.3 kg

For other end plates, see D 7700-2

D 8086 - 07-2018-2.1 17/34

3.2 Characteristics

Oil viscosity approx. 60 mm

Δp-Q characteristic curves

Pressure-limiting valve in the middle input

block type ZPL 22 P6R6

Directional spool valve

PdA(B), A(B)dR

Q ow rate (lpm); p pressure setting (bar)

2-way inow controller

Q ow rate (lpm); p load pressure (bar)

LS pressure limitation coding C ...

Q consumer ow rate (lpm), I control current (A)

18/34 D 8086 - 07-2018-2.1

Control characteristic curve for consumer ow rate

(reference values, example for directional spool valve variant with inow controller type EDL

2 - D. 2...)

Q consumer ow rate (lpm), I control current (A)

D 8086 - 07-2018-2.1 19/34

3.3 Actuations

Solenoid, produced and tested in accordance with DIN VDE 0580

Single-action solenoid with anchor chambers sealed on the outside and connected to the

return duct. The anchors in the anchor chambers are thereby lubricated by the hydraulic oil

and protected against corrosion without the need for maintenance.

Actuation E, EI

Nominal voltage U

24 V DC 12 V DC

Coil resistance R

22 Ω 5.5 Ω

Current, cold I

1.10 A 2.18 A

Limit current I

lim

) 0.78 A 1.56 A

Power, cold P

= U

x I

26 W 26 W

Limit power P

= U

x I

19 W 19 W

Cut-off energy W

Ò 0.3 Ws Ò 0.3 Ws

Relative duty cycle

(reference temperature T

= 50°C)

S1 S1

Required dither frequency 40 to 70 Hz (recommended value: 55 Hz)

Dither amplitude

20% Ò A

Ò 50%

20/34 D 8086 - 07-2018-2.1

Characteristics

Oil viscosity approx. 60 mm

/s I stroke characteristic curve

Control current (I, I

); spool stroke (%)

Electrical connection

Connection pattern for coding

-X 12, -X 24

DIN EN 175 301-803 A

Coil a (1) coil b (2) IP 65 (IEC 60529)

-AMP 12, -AMP 24 -DT 12, -DT 24

AMP Junior Timer

IP 65 (IEC 60529) IP 67 (IEC 60529)

The specifications regarding the IP protection class apply for versions featuring a properly

assembled male connector

D 8086 - 07-2018-2.1 21/34

Dimensions

All dimensions in mm, subject to change.

4.1 Connection blocks

Connection blocks

PSV 3X.-2

Port (ISO 228-1) (BSPP)

P, R G 1/2

LS, M G 1/4

PSV E0-2

End plate

For directional spool valve, see Chapter 4.2, "Valve sections"

22/34 D 8086 - 07-2018-2.1

Adapter plates

Coding ZPL 32

Add-on spool valves, size 3

Add-on spool valves, size 2 acc. to D 7700-2

Coding ZPL 52

Add-on spool valves, size 5

Add-on spool valves, size 2 acc. to D 7700-2

D 8086 - 07-2018-2.1 23/34

4.2 Valve sections

Series intermediate plates

Coding ZPL 22 P6R6

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Directional spool valve with actuation E, EI, AEI, BEI

Coding E Coding EI

Coding AEI

Male connector can be mounted offset by 180°

Ancillary blocks

Coding BEI

D 8086 - 07-2018-2.1 25/34

Additional solenoid versions

Coding -AMP 12, -AMP 24 Coding -DT 12, -DT 24

Directional spool valve with LS pressure limitation and load-signal outlet X

Coding C ... X

LS pressure limitation

Ancillary blocks

Port (ISO 228-1) (BSPP)

X G 1/8

26/34 D 8086 - 07-2018-2.1

Assembly, operation and maintenance recommendations

5.1 Intended use

This valveis intended exclusively for hydraulic applications (uid technology).

The user must observe the safety measures and warnings in this documentation.

Essential requirements for the product to function correctly and safely:

– All information in this documentation must be observed. This applies in particular to all safety measures and warnings.

– The product must only be assembled and put into operation by qualied personnel.

– The product must only be operated within the specied technical parameters. The technical parameters are described in detail in this

documentation.

– The operating and maintenance manual of the components, assemblies and the specic complete system must also always be

observed.

If the product can no longer be operated safely:

1. Remove the product from operation and mark it accordingly.

✓

It is then not permitted to continue using or operating the product.

D 8086 - 07-2018-2.1 27/34

5.2 Note regarding assembly, installation and conversion

The product must only be installed in the complete system with standard and compliant connection components (ttings, hoses, pipes,

xtures, etc.).

The hydraulic power pack must be shut down correctly prior to dismounting; this applies in particular to power packs with hydraulic

accumulators.

Danger

Risk to life caused by sudden movement of the hydraulic drives when dismantled incorrectly!

Risk of serious injury or death.

■

Depressurise the hydraulic system.

■

Perform safety measures in preparation for maintenance.

All installation, set-up, maintenance and repairs must be performed by authorised, qualied and trained staff. The use of this product

beyond the specied performance limits, operation with non-specied uids and/or use of non-genuine spares will invalidate the

warranty.

5.2.1 Mounting

The valve bank must be mounted to the frame or base of the machine in such a way that no stress is induced. Three screws and elastic

washers between the bank and the frame are recommended for mounting.

5.2.2 Piping

All ttings used must utilise deformable seals. The recommended torque values must not be exceeded.

5.2.3 Seal kits

Connection block DS 7700-21

Valve section DS 7700-22

ZPL 32 DS 7700-22Intermediate plate

ZPL 52 DS 7700-52

28/34 D 8086 - 07-2018-2.1

5.3 Operating instructions

Product configuration and setting the pressure and ow rate

The statements and technical parameters in this documentation must be strictly observed.

The instructions for the complete technical system must also always be followed.

Note

■

Read the documentation carefully before usage.

■

The documentation must be accessible to the operating and maintenance staff at all times.

■

Keep documentation up to date after every addition or update.

Caution

Risk of injury on overloading components due to incorrect pressure settings!

Risk of minor injury.

■

Always monitor the pressure gauge when setting and changing the pressure.

Purity and ltering of the hydraulic uid

Fine contamination can significantly impair the function of the hydraulic component. Contamination can cause irreparable damage.

Examples of ne contamination include:

– Metal chips

– Rubber particles from hoses and seals

– Dirt due to assembly and maintenance

– Mechanical debris

– Chemical ageing of the hydraulic uid

Note

Fresh hydraulic uid from the drum does not always have the highest degree of purity. Under some circumstances the fresh

hydraulic uid must be ltered before use.

Pay attention to the cleanliness level of the hydraulic uid in order to maintain faultless operation.

(Also see cleanliness level in Chapter 3, "Parameters".)

(also see cleanliness level in

5.4 Maintenance information

This product is largely maintenance-free.

Conduct a visual inspection at regular intervals, but at least once per year, to check if the hydraulic connections are damaged. If

external leakages are found, shut down and repair the system.

Clean the device surface of dust deposits and dirt at regular intervals, but at least once per year.

D 8086 - 07-2018-2.1 29/34

Other information

6.1 Notes for selection and lay-out

a) Connection block

■

Additional damping options for the connection blocks type PSL and PSV are described in the D 7700 ++ publications.

b) Control blocks

Marking 2 (example EDL 2-DA 2 L 25/16...)

■

The standard version of the load-compensated directional spool valve is tted with an inow controller (marking 2). Thanks to the

control pressure (approx. 5 bar), the consumer ow rate is regulated depending on the spool valve elevation (spool valve edges are

designed as metering orices) regardless of the system pressure and other consumers:

Marking 7 (example EDL 2-DA 7 H 40/40...)

■

If the control pressure is changed, the maximum possible ow rate of the individual consumer may be inuenced (see statements on

marking 2 above). The control pressure is approx. 9 bar for marking 7. This results in a nominal ow rate that is approx.1.3 times

higher than for directional spool valve variants with marking 2 (standard).

Marking DAR 2 and DAR 7

■

In addition to its control function, the pressure compensator also acts as a check valve. This prevents a possible ow direction

reversal in the event of a shortage in supply on the pump side.

c) Use of variable pumps

■

For load-sensing controls in combination with variable pumps, the LS signal duct to the (load-sensing controller) of the pump is

limited to minimise circulation losses when in neutral position (i.e. when no hydraulic oil is dispensed to the consumers). This

limiting takes place via the proportional directional spool valves. Without this limiting, the pump would have to work in the no-lift

position with its remaining delivery ow against the maximum pressure setting of the pressure controller. As there are directional

spool valves without this limiting possibility, some brands of (load-sensing controllers) have an internal bypass orice from the LS

signal inlet to a decompressed leakage outlet. Thanks to the internal limiting of proportional directional spool valves of type EDL,

this bypass channel is not necessary and it can even cause malfunctions due to lost control oil. For functional reasons, the control

oil ow must be consciously limited (approx. 2lpm) (creeping of the consumer).

Note

Care must be taken to ensure that a possible bypass orice in the pressure delivery ow controller is sealed.

30/34 D 8086 - 07-2018-2.1

d) Combination with load-holding valves

■

If three control elements, the 3-way controller in the pump or in the connection block, the 2-way controller in the directional valve

and load-holding valve insert are connected in series, oscillations may occur due to external load alternations and resonance effects.

These effects can be effectively suppressed by systematic use of a bypass orice and a throttle, check, pre-load valve combination

connected in parallel within the control oil system at the load-holding valve type LHDV acc. to D 7770. Similar behaviour can be

achieved using load-holding valves of type LHT acc. to D 7918.

e) Combination of more than 10 directional spool valves

■

By switching the load-sensing line in series, a total of max. 10 directional spool valves can be linked. If more than 10 directional

spool valves are required, these must be arranged in separate valve banks.

f) Additional components

For electrical actuations

■

Line connector type MSD and others: D 7163 (Line connector MSD 3-309 is included in scope of delivery for coding G 12 and G 24)

■

Proportional amplifier type EV22K5: D 7817/2

■

Proportional amplifier type EV1M3: D 7831/2

■

Proportional amplifier type EV1D: D 7831 D

■

Proportional amplifier type EV2S: D 7818/1

■

CAN node type CAN-IO: D 7845-IO 14

■

Programmable logic valve control PLVC 8 according to D 7845-2

■

Joystick type EJ: D 7844

Radio controls are accepted if they full the requirements acc. to Sk 7814

(Approved brands: HBC-ELEKTRONIK, D-74564 Crailsheim; HETRONIK Steuer-Systeme, D-84085 Langquaid; NBB-Nachrichtentechnik,

D-75248 Ölbronn-Dürrn; SCANRECO Industrieelektronik AB, S-5227 Södertälje, HATOX, D-75217 Birkenfeld)

Load-holding valves

■

Load-holding valve type LHT: D 7918

■

Load-holding valve type LHDV: D 7770

■

Load-holding valve type CLHV - Cartridge: D 7918-VI-C

Other valves

■

Proportional directional spool valve, type PSL and PSV size 2: D 7700-2 (can be combined with EDL 2 without intermediate plate)

■

Proportional directional spool valve, type PSL, PSM and PSV size 3: D 7700-3 (can be combined with EDL 2 using intermediate plate

ZPL 32)

■

Proportional directional spool valve, type PSL, PSM and PSV size 5: D 7700-5 (can be combined with EDL 2 using intermediate plate

ZPL)

■

Proportional directional spool valve type PSLF, PSVF and SLF size 3: D 7700-3F (directional spool valve in ange design)

■

Proportional directional spool valve type PSLF, PSVF and SLF size 5: D 7700-5F (directional spool valve in ange design)

■

Connection block type HMPL and HMPV for proportional directional spool valve: D 7700 H

D 8086 - 07-2018-2.1 31/34

6.2 Circuit examples

Order coding example 1: PSL control for hydraulic oil supply via constant pump

PSL 3 U/250 - 2 - DA 2

- DA 2

40/25

25/16 C 150 X

40/40 W 3

/2 AN200 BN200

/2 AN250 BN250

/2 - E0 - DT 24

32/34 D 8086 - 07-2018-2.1

Order coding example 2: PSV control for hydraulic oil supply via variable pump

PSV 551/300 - 3 - 32

- ZPL 32

- A 2

- DA 2

80/80

40/25

25/16

C200

A200 B150

/EI

/2 - E1 - AMP 24 K 4

D 8086 - 07-2018-2.1 33/34

Order coding example 3: PSV control for hydraulic oil supply via variable pump

PSV E0 - 2 - DA 2

- DA 2

- ZPL 22 P6R6/250

- DA 2

50/50

25/25

16/10

6/3

/EI

/2 AS180 BS100

/2 AS200 BS200

/2 - E0 - AMP 24

D 8086 - 07-2018-2.1

HAWE Hydraulik SE

Einsteinring 17 | 85609 Aschheim/Munich | Postfach 11 55 | 85605 Aschheim | Germany

Tel +49 89 379100-1000 | Fax +49 89 379100-91000 | info@hawe.de | www.hawe.com

Further information

Additional versions

■

Proportional directional spool valve, type PSL and PSV size 2: D 7700-2

■

Proportional directional spool valve, type PSL, PSM and PSV size 3: D 7700-3

■

Proportional directional spool valve, type PSL, PSM and PSV size 5: D 7700-5

■

Proportional directional spool valve type PSLF, PSVF and SLF size 3: D 7700-3F

■

Proportional directional spool valve type PSLF, PSVF and SLF size 5: D 7700-5F

■

Proportional directional spool valve banks type PSLF and PSVF size 7: D 7700-7F

■

Directional spool valve bank type SWS: D 7951

■

Directional spool valve banks type CWS 2: D 7951 CWS