Proportional directional spool valve type EDL

Product documentation

D 808603-2015-1.2

Series connection

Operating pressure pmax: 320 barFlow rate Qmax: 40(60) lpm

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© by HAWE Hydraulik SE.

The forwarding and reproduction of this document, as well as the use and communication of its contents, are forbidden unless expresse-

ly permitted.

Any breach or infringement will result in liability for damages.

All rights reserved concerning patent or utility model registrations.

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Contents

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

2 Type coding, overview.......................................................................................................................................5

3 Available versions, main data............................................................................................................................9

3.1 Connection blocks and end plates........................................................................................................................ 9

3.1.1 Connection blocks for constant pump systems (with integrated 3-way controller) type PSL........................................... 9

3.1.2 Connection blocks for control pumps/constant pressure systems............................................................................. 10

3.1.3 Adapter plates................................................................................................................................................. 11

3.1.4 End plates.......................................................................................................................................................11

3.2 Add-on spool valves......................................................................................................................................... 12

3.2.1 Directional spool valve......................................................................................................................................12

3.2.2 In series intermediate plates............................................................................................................................. 15

4 Parameters..................................................................................................................................................... 16

4.1 General and hydraulic....................................................................................................................................... 16

4.2 Characteristic curves......................................................................................................................................... 18

4.3 Actuations....................................................................................................................................................... 19

5 Dimensions.................................................................................................................................................... 21

5.1 Connection blocks............................................................................................................................................ 21

5.2 In series intermediate plates............................................................................................................................. 23

5.3 Directional spool valve with actuation E, EI........................................................................................................ 24

6 Installation, operation and maintenance information........................................................................................25

6.1 Designated use................................................................................................................................................ 25

6.2 Assembly information........................................................................................................................................25

6.3 Operating instructions.......................................................................................................................................26

6.4 Maintenance information................................................................................................................................... 26

6.5 Planning information........................................................................................................................................ 27

6.5.1 Notes for selection and lay-out..........................................................................................................................27

6.5.2 Circuit examples...............................................................................................................................................30

7 Other information...........................................................................................................................................33

7.1 Note regarding assembly, installation and conversion............................................................................................33

7.1.1 Mounting.........................................................................................................................................................33

7.1.2 Piping.............................................................................................................................................................33

7.1.3 Sealing kits..................................................................................................................................................... 33

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1 Overview 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 flows for the individual consumers can be individually adjusted. By means of

additional functions in the intermediate plates (longitudinal and sandwich valve

combination) and ancillary blocks the proportional directional spool valve can be

flexibly adapted to different control tasks.

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

proportional directional spool valve type PSL and PSV in size 2. It is used in

mobile hydraulics, in particular in civil engineering and hydraulic tools.

Features and benefits:

■ One product for various control functions and small volume 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

Figure 1: Proportional directional spool valve type EDL

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2 Type coding, overview

Order coding example:

PSL 3 . 1 Z /D400 -2 -DA

-DA

2

2

L

H

25/16

40/25

/E

/EI

/2

/2 AN300 BN350 -E4 -G24

Solenoid

voltage

Table 15 Solenoid voltage

and design

End plates Table 14 End plates

Ancillary blocks Table 13 Connection blocks

Actuation types Table 12 Actuation types and additives

Volumetric flow key figure Table 11 Volumetric flow key figure

Circuit symbols Table 10 Circuit symbols

Directional spool valve, basic valve Table 9 Directional spool valve, basic valve

Connection Table 8 Connection on the directional spool valve for A and B

Size Table 7 Size

Pressure-limiting valve Table 6 Pressure-limiting valve

2/2-way solenoid valve Table 5 2/2-way solenoid valve

Control oil supply Table 4 Control oil supply

Additional elements Table 3 Additional features

Connection Table 2 Connection on the connection block for P and R

Basic type Table 1 Basic type for connection block

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 is to be provided (see note in Chapter 6.5, "Planning information" ("combination of more than 10 directional

spool valves")).

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Table 1 Basic type for connection block

Coding Description

PSL Hydraulic oil supply via constant pump (open

centre)

PSV Hydraulic oil supply via control pump with load-

sensing controller (closed centre), as 2nd separate

block and for constant pressure systems

ZPL 52 Adapter plate for transition from PSL(V) size 5 (acc.

to D 7700-5) to EDL 2

ZPL 32 Adapter plate for transition from PSL(V) size 3 (acc.

to D 7700-3) to EDL 2

PSV E0 Initial plate without separate ports. Can only be

used in combination with the middle input block

ZPL 22 P6R6, see Chapter 3.2.2, "In series interme-

diate plates"

Operating pressure max = 250 bar!

Table 2 Connection on the connection block for P and R

Coding Connection Standard

3 G 1/2 (BSPP) (ISO 228/1)

UNF 2 3/4-16 UNF-2B (SAE-8, SAE J 514)

Table 3 Additional features

Coding Description

No designation Standard version

S

W

Additional damping element in the LS gallery

B

B 4...7

Orifice in LS line

G Restrictor check valve

Z Restrictor check valve + release valve (type PSL)

H Increased circulation pressure of the 3-way

controller approx. 14 bar(only PSL)

U

UH

Automatic reduction of the pump circulation

pressure due to bypass valve

N Integrated pump gallery locking (type PSV)

Table 4 Control oil supply

Coding Description

No designation Without pressure-reducing valve, e.g. for external

control oil supply (min. 20 bar up to max. 40 bar)

1 With integrated pressure-reducing valve for internal

control oil supply (control pressure approx. 20 bar)

2 With integrated pressure-reducing valve for internal

control oil supply (control pressure approx. 40 bar)

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Table 5 Optional 2/2-way solenoid valve for random pump

direction switching

Coding Description

No designation Without directional valve, however an option for

flange mounting is available

Z

ZMDe-

energised

open

Pump direction switching for de-

energised valve

V De-

energised

closed

Pump direction switching with

energised valve

F..

or D..

For pressure-limiting valve for second pressure stage

(e.g. F50)

PA

PB

PD

Proportional pressure-limiting valve with different

pressure ranges

Table 6 Pressure-limiting valve (main pressure-limiting valve)

in the connection block (only fixed)

Coding Description

/D... Pressure-limiting valve set to ... bar

/... for type PSL...U

Table 7 Size

Coding Description

2 Size 2

Table 8 Connection on the directional spool valve for A and B

Coding Description

DA To attach ancillary blocks, see Table 13

Table 9 Directional spool valve, basic valve

Coding Description

2 Directional spool valve with input controller for

individual volumetric flow metering

5 Input controller with reinforced spring for higher

volumetric flow

R 2, R 5 like A 2, A 5 but with check valve function

Table 10 Circuit symbols

Coding L H

Table 11 Volumetric flow key figure for outlets A and B

(see Table 5 Chapter 3.2.1)

Coding Description

.../... Coding for outlet A or B (can be selected separate-

ly) 3, 6, 10, 16, 25, 40, 50

Table 12 Actuation types

Coding Description

/E Electrical actuation with stroke limitation

/EI Electrical actuation with manual override

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Table 13 Ancillary blocks

Coding Description

/2

/3

/UNF 2

Ancillary blocks without additional functions

/2 AS.. BS.. Ancillary blocks with shock valves at A and B

(mutual spraying), with pressure specification (bar)

/2 AN... BN...

/UNF 2 AN..

BN..

Ancillary blocks with shock and servo-suction valves

at A and B, with pressure specification (bar)

/UNF 2 AN..

/UNF 2 BN..

Ancillary blocks with shock and servo-suction valves

at A or B, with pressure specification (bar)

/2 AL.. BL..

/UNF 2 AL..

BL..

Ancillary blocks with load-holding valves at A and

B, with pressure specification (bar)

/2 AL..

/2 BL..

/UNF 2 AL..

/UNF 2 BL..

Ancillary blocks with load-holding valves at A or B,

with pressure specification (bar)

/2 DRH

/UNF 2 DRH

Ancillary blocks with releasable check valves

/32 DFA

/32 DFB

Ancillary blocks for differential circuit

/3 AVT

/3 BVT

Check valve for A or B with emergency function

/2 A(B) HN Ancillary blocks with emergency drain

Table 13a Intermediate plates

Coding Description

/ZSS

/ZVV

Intermediate plates with bypass valves

/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)

/Z 2 A(B).. Intermediate plates with additional port

/ZDRH Intermediate plates with releasable check valves

/Z 40 Spacer plate

/ZANBN Intermediate plates with servo-suction valves

/ZVX

/ZXV

Intermediate plates with check valves in A or B

Table 14 End plates

Coding Description

E. With thread acc. to ISO 228/1

E. UNF With thread acc. to SAE-4, acc. to SAE J 514

E0 End plate without additional function, not in

combination with valve sections SL2, SL3 or SL5

Operating pressure max. 250 bar!

E1 With control oil return line T external to tank

(standard version)

E2 Like E1, with additional connection Y for connection

to the LS outlet of another one, separate

E4 Like E1, however control oil return line is internal,

maximum return pressure of 10 bar!

E5 Like E2, however control oil return line is internal,

maximum return pressure of 10 bar!

E17... E20

E17 UNF... E20

UNF

For variants see D 7700-2, Table 10

Table 15 Solenoid voltage and solenoid design

Coding Description

G 12 12V DC, connection acc. to DIN EN 175 301-803 A

G 24 24V DC, connection acc. to DIN EN 175 301-803 A

AMP 12 K 4 12V DC, connection with AMP Junior Timer

AMP 24 K 4 24V DC, connection with AMP Junior Timer

DT 12 12V DC, connection with Deutsch connector

DT 24 24V DC, connection with Deutsch connector

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3 Available versions, main data

3.1 Connection blocks and end plates

There are two basic variants of connection blocks:

■ Connection blocks with integrated 3-way controller when using a constant pump system (open centre) - type PSL (Chapter 3.1.1,

"Connection blocks for constant pump systems (with integrated 3-way controller) type PSL ")

■ Connection blocks for use with control 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 (Chapter 3.1.2,

"Connection blocks for control pumps/constant pressure systems ")

Order coding of one connection block as an individual section (examples):

PSL 31 Z/250 - 2 - G24

Note

Size specification absolutely necessary, here -2!

3.1.1 Connection blocks for constant pump systems (with integrated 3-way controller) type PSL

The EDL valve sections can be easily combined with all type PSL(V) connection blocks, size 2. For a detailed overview of the available

variants, see D 7700-2.

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3.1.2 Connection blocks for control pumps/constant pressure systems

Order coding example:

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

Additional element Table 2 Coding for additional features

Connection blocks Table 1 Connection blocks

Table 1 Connection blocks

Coding Connection (BSPP) Description

PSV 3X-2 G 1/2 Connection blocks for control pumps

PSV 3X B.-2 G 1/2 Connection blocks for control pumps with damping orifices, 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 3.2.2, "In series intermediate plates"

Operating pressure max = 250 bar!

Circuit symbols

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

For additional connection blocks for control pumps/constant pressure systems, see D 7700-2.

The EDL valve sections can be easily combined with all type PSL(V) connection blocks, size 2.

Table 2 Coding for features in the LS signal duct for the damping of pump controllers

(For notes and explanation see Chapter 6.5, "Planning information" ("About the connection block"))

Additional features only suitable where control pumps are used (limitation of the control oil flow).

Coding Description

No designation Standard, without additional feature

B 4, B 5, B 6, B 7, B 8 With orifice # 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm or 0.8 mm in the LS duct (to limit control oil flow)

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3.1.3 Adapter plates

Order coding example:

PSL 41/D250-3 - 42 H 80/63 /E

- ZPL 32

- DA2 L 25/16 /E/2 - E4 - G 24

Coding Port Description Circuit symbol

ZPL 32 -- Adapter plate for transition from proportional directional spool valves,

type PSL(V) size 3 to EDL 2.

ZPL 52 -- Adapter plate for transition from proportional directional spool valves,

type PSL(V) size 5 to EDL 2

3.1.4 End plates

The EDL valve sections can be easily combined with all type PSL(V) end plates, size 2. For a detailed overview of the available versions,

see D 7700-2.

Coding Connection Description Circuit symbol

E0 -- End plate without additional function, not in combination with valve

sections SL2, SL3 or SL5

Operating pressure max. 250 bar!

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3.2 Add-on spool valves

3.2.1 Directional spool valve

Order coding example:

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

Ancillary blocks Table 7 Ancillary blocks

Actuation types Table 6 Actuation types

Flow Table 5 Maximum flow

Circuit symbols Table 4 Circuit symbols

Directional spool valve, basic valve Table 3 Directional spool valve, basic valve

Order coding of the individual sections (examples) Directional spool valve

Valve spool (single)

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

EDL 2 - L 25/40

Note

Size specification absolutely necessary, here EDL 2!

The valve spools are subsequently interchangeable, e.g. if a different volumetric flow rating than initially planned becomes

necessary.

Table 3 Directional spool valve, basic valve

Coding Description

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

spool valve, standard version, control pressure approx. 6 bar)

DA 5 With input 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 PSL.H../... or type PSV or the middle input block type ZPL 22

P6R6, see Chapter 6.5 "Planning information"

DAR 2

DAR 5

Like coding 2, 5, but with additional check valve function (spool valve = slight leakage)

Only usable in conjunction with connection blocks type PSL.H../... or type PSV or the middle input block type ZPL 22

P6R6, see Chapter 6.5 "Planning information"

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Circuit symbol

With respect to main flow and

actuation, the circuit symbols are

neutral and must be supplemented by

the corresponding circuit symbols given

in Tables 5, 6 or 7, see also examples in

Table 7 and Chapter 6.

Ancillary block and intermediate block acc. to

D 7700-2

4/3-way directional

spool valve with input

controller DA2... (DA5...,

DA7...)

Table 4 Circuit symbols

L H

Table 5 Maximum flow P d A(B) in accordance with coding

Coding for volumetric flow QA, B (lpm)

at consumer ports A and B

Coding for spool valve

acc. to Table 4

3 6 10 16 25 40 50

2 3 6 10 16 25 40 50

5 4 9 14 22 34 54 --

Note

The flows for the consumer ports A and B can be selected freely, e.g. 25/40, 6/16. This enables optimal adaptation to the

respective consumer while exploiting the full functional lift. In addition there is the possibility of stroke limitation.

The maximum reflux volumetric flow must not exceed 80 lpm.

Spool valves with coding 50 may only be used at cylinder ratio 1:1.

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Table 6 Actuation types

Actuation Electrical actuation

Electrical actuation with stroke

limitation

Electrical actuation with manual

override

Coding

E EI

Circuit symbol

Correcting variables Control current ratio I/IN

min. approx. 0.2

max. approx. 1

Note

■ For reference values for start of flow at A or B (= min) up to max. usable volume flow in accordance with the volumetric flow

coding Tables , see characteristic curves, Chapter 4.2 "Characteristic curves ".

Table 7 Ancillary blocks

The EDL valve sections can be easily combined with all type PSL(V) connection blocks, size 2. For a detailed overview of the available variants,

see D 7700-2.

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3.2.2 In series intermediate plates

The EDL valve sections can be easily combined with all type PSL(V) connection blocks, size 2. For a detailed overview of the available

variants, see D 7700-2.

PSV E0-2 - DA2 L 40/40 /EI

- ZPL 22 P6R6

- DA2 H 25/16 /EI/2 - E0 - G 24

Coding Connection Description Circuit symbol

ZPL 22 P6R6 P and R = G 1 1/4

(BSPP)

Middle input block for installation of EDL 2 sections on both sides.

Hydraulic oil supply via control pump with load-sensing controller, as

2nd separate block or for constant pressure systems.

Only possible in combination with initial plate PSV E0 - 2.

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4 Parameters

4.1 General and hydraulic

General information

Description Proportional directional spool valves EDL

Design Spool valve in block construction, up to 10 spool valves, all-steel design

Material Steel; nitrided valve housing, electrogalvanised sealing nuts and connection block, hardened

and ground functional inner parts

Steel; valve housing galvanized zinc plated; hardened and ground functional inner parts

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

Mounting Valve bank M8 Chapter 5, "Dimensions"

Tightening torques See Chapter 5, "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.

Caution

No pressure line!

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)

Surface treatment All surfaces corrosion-inhibiting, gas nitrided

Solenoid at actuation E.. Zinc galvanised and passivated

Hydraulic fluid Hydraulic oil conforming DIN 51 524 part 1 to 3; ISO VG 10 to 68 conforming DIN 51 519

Viscosity limits: min. approx. 4, max. approx. 1500 mm2/s

opt. operation approx. 10... 500 mm2/s.

Also suitable are biologically degradable pressure fluids types HEPG (Poly-alkylenglycol) and

HEES (Synth. Ester) at service temperatures up to approx. +70°C.

Recommended purity class ISO 4406

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

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Temperatures Ambient: approx. -40 ... +80°C, Fluid: -25 ... +80°C, Note the viscosity range!

Permissible temperature during start: -40°C (observe start-viscosity!), as long as the service

temperature is at least 20K higher for the following operation.

Biologically degradable pressure fluids: Observe manufacturer's specifications. By considera-

tion of the compatibility with seal material not over +70°C.

Note

Note restrictions on explosion-proof solenoid!

Pressure and volumetric flow

operating pressure ■ pmax = 320 bar; connections P, A, B, LS, M, Y

■ The achievable pressure on the consumer side of the directional spool valves is lower by an

amount equal to the fall in internal control pressure at the 3-way valve PSL (see character-

istic curve) or the pump controller (PSV).

■ Return connection R(R1) ≤ 50 bar

volumetric flow Max. consumer volumetric flow in accordance with Table 5 Chapter 3.2.1, "Directional spool

valve"

Weight

Connection block

PSV 3X = 1.7 kg

PSV E0 = 0.3 kg

For other connection blocks, see D 7700-2

Valve section

DA.. E, EI = 1.6 kg

For other ancillary blocks, see D 7700-2

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4.2 Characteristic curves

Characteristic curves

Viscosity during measurements

approx. 60 mm2/s

Δp-Q characteristic curves

Pressure-limiting valve in the middle input

block, type

ZPL 22 P6R6

Directional spool valve

PdA(B), A(B)dR

Figure 2: Q volumetric flow (lpm);

p pressure setting (bar)Figure 3: Q volumetric flow (lpm);

/p pressure setting (bar)

2-way input controller

Figure 4: Q volumetric flow (lpm);

p load pressure (bar)

Control characteristic curve for consumer volumetric flow

(guidelines, example for directional spool valve variant with input controller type EDL 2 - D.

2...)

Figure 5: Q consumer volumetric flow (lpm), I

control current (A)

Figure 6: Q consumer volumetric flow (lpm), I

control current (A)

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4.3 Actuations

For other data, such as coding, circuit symbols, etc. see Chapter 3.2, " Add-on spool valves"

General information

Actuation E, EI Proportional solenoid, manufactured and tested acc. to DIN VDE 0580

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

return duct. The anchors are thereby maintenance-free lubricated by the hydraulic fluid and

protected against corrosion.

Specifications apply to all solenoid versions, unless specified otherwise

Nominal voltage UN 24V DC 12V DC

Coil resistance R20 22 Ω 5.5 Ω

Current, cold I20 1.10 A 2.18 A

Limit current IG (Ilim) 0.78 A 1.56 A

Power, cold P20 = UN x I20 26 W 26 W

Limit power PG = UN x IG 19 W 19 W

Cut-off energy WA Ò 0.3 Ws Ò 0.3 Ws

Rel. duty cycle (reference temperature δ11 =

50°C)

S1 S1

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

Dither amplitude 20% Ò AD Ò 50%

Characteristic curves

Viscosity during measurements

approx. 60 mm2/s

I stroke characteristic curve

Figure 7: Control current (I,IG); Spool stroke (%)

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Electrical connection

Circuitry 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 plug

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5 Dimensions

All dimensions in mm, subject to change!

5.1 Connection blocks

Connection blocks

PSV 3X.-2 PSV E0-2

1 End plate

2 Directional spool valve, see Chapter 5.3

1 End plate

2 Directional spool valve, see Chapter 5.3

Ports

P, R LS, M

PSV 3X.-2 G 1/2 G 1/4 (ISO 228/1)

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Adapter plates

ZPL 32 ZPL 52

1 Add-on spool valves, size 3

2 Add-on spool valves, size 2 acc. to D 7700-2 1 Add-on spool valves, size 5

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

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5.2 In series intermediate plates

In series intermediate plates

ZPL 22 P6R6

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5.3 Directional spool valve with actuation E, EI

Actuation type E Actuation type EI

1 Plug may be mounted offset by 180°

2 Ancillary blocks

1 Plug may be mounted offset by 180°

2 Ancillary blocks

Additional solenoid versions

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

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6 Installation, operation and maintenance information

6.1 Designated use

This fluid-power product has been designed, manufactured and tested acc. to standards and regulations generally applicable in the

European Union and left the plant in a safe and fault-free condition.

To maintain this condition and ensure safe operation, operators must observe the information and warnings in this documentation.

This fluid-power product must be installed and integrated in a hydraulic system by a qualified staff who is familiar with and observes

the general engineering principles and relevant applicable regulations and standards.

In addition, application-specific features of the system or installation location must be taken into account if relevant.

This product may only be used within oil-hydraulic systems.

The product must be operated within the specified data. This documentation contains the technical parameters for various product

versions.

Note

Non-compliance will void any warranty claims made against HAWE Hydraulik.

6.2 Assembly information

The hydraulic accumulator must be integrated in the system via state of the art connection components (screw fittings, hoses, pipes,

etc.). The hydraulic system must be shut down as a precautionary measure prior to dismounting; this applies in particular to systems

with hydraulic accumulators.

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6.3 Operating instructions

Product, pressure and/or flow settings

All statements in this documentation must be observed for all product, pressure and/or flow settings on or in the hydraulic system.

Caution

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

■ Always monitor the pressure gauge when setting or changing the pressure.

Filtering and purity of the hydraulic fluid

Soiling in the fine range, e.g. abraded material and dust, or in the macro range, e.g. chips, rubber particles from hoses and seals, can

cause significant malfunctions in a hydraulic system. It is also to be noted that new hydraulic fluid “from the drum” does not necessari-

ly meet the highest purity requirements.

For trouble-free operation pay attention to the purity of the hydraulic fluid (see also purity class in Chapter 4, "Parameters").

6.4 Maintenance information

This product is largely maintenance-free.

Conduct a visual inspection to check the hydraulic connections for damage at regular intervals, but at least once per year. If external

leaks are found, shut down and remedy.

Check the device surfaces for dust deposits at regular intervals (but at least annually) and clean the device if required.

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6.5 Planning information

6.5.1 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.

Caution

The load pressure must be at least 20 bar.

b) Control blocks

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

■ The standard version of the load-compensated directional spool valve is fitted with an input controller (coding 2). Thanks to the

control pressure (approx. 6 bar ), the consumer volumetric flow is regulated depending on the spool valve elevation (spool valve

edges are designed as metering orifices) regardless of the system pressure and other consumers:

Coding 5 (example EDL 2-DA 2 H 40/40...)

■ If the control pressure is changed, the maximum possible volumetric flow of the individual consumer may be influenced (see

statements on codings 1 and 2 above). The control pressure is approx. 9 bar for coding 5. This results in a usable volumetric flow

that is approx. 1.3 times higher than for directional spool valve variants with coding 2 (standard).

Coding DAR 2 and DAR 5

■ In addition to its control function, the pressure compensator also acts as a check valve. This prevents a possible flow reversal in the

event of a shortage in supply on the pump side.

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c) Use of control pumps

■ For load-sensing controls in combination with control 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 consumer). 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 flow 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 orifice 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 flow must be consciously limited (approx. 2 lpm) (creeping of the consumer).

Note

Care must therefore be taken to ensure that a possible bypass orifice in the pressure delivery flow controller is sealed.

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 switched in series, oscillations may occur due to external variations of load and resonance effects.

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

connected in parallel within the control oil circuit 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.

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f) Additional components

For electro-hydraulic actuations

1. Male connector MSD 3-309 Standard, included in the delivery

SVS 296107 Male connector with LEDs for function deactivation acc. to

Chapter 3.2, " Add-on spool valves" Table (for more details see

D 7163)

2. Electric amplifier EV 22 K 2-12(24) acc. to D 7817/1

One board can control 2 directional valves

3. Electric amplifier EV 1 M3 acc. to D 7831/2

EV 1 D acc. to D 7831 D

A remote control potentiometer with direction switches is also required

(see detailed information in D 7831/2 Chapter 6.2)

4. Programmable logic valve control PLVC acc. to D 7845 ff

5. Electric joystick EJ 1, EJ 2 or EJ 3 acc. to D 7844

6. Radio controls are accepted if they fulfil the requirements acc. to Sk 7814

(Approved brands: Co. HBC-ELEKTRONIK in D-74564 Crailsheim, Germany; Co. HETRONIK Steuer-Systeme in D-84085 Langquaid, Germany; Co.

NBB-Nachrichtentechnik in D-75248 Ölbronn-Dürrn, Germany; Co. SCANRECO Industrieelektronik AB, Box 19144, S-5227 Södertälje, Sweden)

Load-holding valves

■ Load-holding valves type LHT in accordance with D 7918 or type LHDV in accordance with D 7770 corresponding to note Chapter 6.5,

"Planning information" ("Combination with load-holding valves"), type LHK in accordance with D 7100 only for particularly “stiff”

complete systems and for directional spool valves without input controller (coding 1 in accordance with Table , Chapter 3.2.1,

"Directional spool valve")

Other valves

■ Proportional directional spool valve type PSL(V) size 2 acc. to D 7700-2 (combinable without intermediate plate with EDL 2)

■ Proportional directional spool valve type PSL(V) size 3 acc. to D 7700-3 (combinable via intermediate plate ZPL 32 with EDL 2)

■ Proportional directional spool valve type PSL(V) size 5 acc. to D 7700-5 (combinable via intermediate plate ZPL with EDL 2)

■ Proportional directional spool valve type PSL(V)F size 3 acc. to D 7700-3F (directional spool in flange design)

■ Proportional directional spool valve type PSL(V)F size 5 acc. to D 7700-5F (directional spool in flange design)

■ Connection blocks type HMPL and HMPV acc. to D 7700 H

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6.5.2 Circuit examples

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

PSL 3U/250 - 2 - DA 2

- DA 2

- DA 2

- DA 2

L

L

H

H

40/25

25/16

16/16

40/40

/E/2 AN 200 BN 200

/E/2 AN 250 BN 250

/E/2

/E/2 E0-G24

www.hawe.de | 2015 03-2015-1.2 - D 8086 - EDL 31

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

PSV 551/300 - 3 - 3 2

- ZPL 32

- A 2

- DA 2

- DA 2

O

J

L

L

80/80

40/25

25/16

25/16

C200

A200 B150

/EI

/EI/2

/EI/2

/EI/2 E1-AMP 24 K4

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

PSV E0 - 2 - DA 2

- DA 2

- ZPL 22 P6R6/250

- DA 2

- DA 2

H

H

L

L

50/50

25/25

16/10

6/3

/EI/2 AS 180 BS 100

/EI/2 AS 200 BS 200

/EI/2

/EI/2 E0-AMP 24

www.hawe.de | 2015 03-2015-1.2 - D 8086 - EDL 33

7 Other information

7.1 Note regarding assembly, installation and conversion

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

beyond the specified performance limits, operation with non-specified fluids and/or use of non-genuine spares will invalidate the

warranty.

7.1.1 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.

7.1.2 Piping

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

7.1.3 Sealing kits

Connection block DS 7700-21

Valve section DS 7700-22

ZPL 32 DS 7700-22Intermediate plate

ZPL 52 DS 7700-52

D 8

086 -

EDL_

03-2

015-1

.2

HAWE Hydraulik SE

Streitfeldstraße 25 | 81673 München | Postfach 80 08 04 | 81608 München | Germany

Tel +49 89 379100-1000 | Fax +49 89 379100-9100 | info@hawe.de | www.hawe.com

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, PSVF and SLF size 7: D 7700-7F

■ Directional spool valve bank type SWS: D 7951