4/2 AND 4/3 PROPORTIONAL DIRECTIONAL VALVES, DIRECT OPERATED, WIT ELECTRICAL POSITION FEEDBACK, WITH

4WREE

Material #: R900929889

Model : 4WREE6EA32-2X/G24K31/F1V

Direct operated proportional directional valve with electrical position feedback and integrated electronics (OBE) Control of flow direction and size Operation by means of proportional solenoids with central thread and detachable coil For subplate mounting: Porting pattern according to ISO 4401 Spring-centered control spool

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Direct operated proportional directional valve with electrical position feedback and integrated electronics (OBE) Control of flow direction and size Operation by means of proportional solenoids with central thread and detachable coil For subplate mounting: Porting pattern according to ISO 4401 Spring-centered control spool

Type 4WREE...-2X/...

The 4/2 and 4/3 proportional directional valves are designed as direct operated devices in plate design. Operation by means of proportional solenoids with central thread and detachable coil. The solenoids are controlled via integrated electronics.

Set-up:

The valve basically consists of:

Housing (1) with connection surface

Control spool (2) with compression springs (3 and 4) and spring plates (5 and 6)

Solenoids (7 and 8) with central thread

Position transducer (9)

Integrated electronics (13)

Electrical zero point adjustment (12), accessible via Pg7

Function:

With de-energized solenoids (7 and 8), central position of the control spool (2) due to compression springs (3 and 4) between the spring plates (5 and 6)

Direct actuation of the control spool (2) by the control of one proportional solenoid, e. g. solenoid "b" (8)

→ Control spool (2) is moved to the left in proportion to the electrical input signal

→ Connection from P to A and B to T via orifice-type cross-sections with progressive

flow characteristics

Switching off of the solenoid (8)

→ Control spool (2) is returned to the central position by the compression spring (3)

In the de-energized state, the control spool (2) is held in a mechanical central position by the return springs of the solenoids. With control spool symbol "V", this position does not correspond to the hydraulic central position! When the electric valve control loop is closed, the control spool is positioned in the hydraulic central position.

Important notice:

The PG fitting (11) must not be opened. Mechanical adjustment of the adjustment nut located below is prohibited and damages the valve!

Valve with two spool positions: (Type 4WREE...A...)

The function of this valve version basically corresponds to the valve with three spool positions. The 2 spool position valve is, however, only equipped with solenoid “a” (7). Instead of the 2nd proportional solenoid, a plug screw (10) is installed.

Notice:

Due to the design principle, internal leakage which may increase over the life cycle is inherent to the valves.

Notice:

The tank line must not be allowed to run empty. With corresponding installation conditions, a preload valve (preload pressure approx. 2 bar) must be installed.

01

02

03

04

05

06

07

08

09

10

11

4

WREE

2X

/

G24

K31

/

*

01

4 main ports

4

02

Proportional directional valve with electrical position feedback and integrated electronics (OBE)

WREE

03

Size 6

6

Size 10

10

04

Symbols; for the possible version, see "Symbols/Circuit diagrams"

E; E1-; V; V1-; W; W1-; EA; WA

Rated flow NG6

05

4 l/min

4

8 l/min

8

16 l/min

16

32 l/min

32

Rated flow NG10

05

25 l/min

25

50 l/min

50

75 l/min

75

06

Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions)

2X

07

Supply voltage 24 V

G24

Electrical connection

08

Connector DIN EN 175201-804

K31

Electrical interface

09

Command value ±10 V

A1

Command value 4 to 20 mA

F1

Seal material

10

NBR seals

M

FKM seals

V

11

Further details in the plain text

*

For applications outside these parameters, please consult us!

general

Type

4WREE

Size

6 10

Installation position

any, preferably horizontal

Ambient temperature range

°C

-20 … +50

Storage temperature range

°C

-20 … +80

Weight

kg

2.4 6.5

MTTFD values according to EN ISO 13849 1)

y

150
1) With control spool types E, E1, EA, W, W1, WA; in longitudinal control spool direction, there is sufficient positive overlap without shock/vibration load; observe the installation orientation with regard to the main direction of acceleration.

hydraulic

Size

6 10

Maximum operating pressure

bar

315

Maximum operating pressure

Port P

bar

315

Port T

bar

210

Port A

bar

315

Port B

bar

315

Maximum flow

l/min

80 180

Nominal flow

l/min

4
8
16
32
25
50
75

Hydraulic fluid

see table below

Hydraulic fluid temperature range

°C

-20 … +80

preferably

°C

+40 … +50

Viscosity range

mm²/s

20 … 380

preferably

mm²/s

30 … 46

Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1)

Class 20/18/15 according to ISO 4406 (c)

Hysteresis

%

≤ 0.1

Range of inversion

%

≤ 0.05

Response sensitivity

%

≤ 0.05

Zero shift upon change of

Hydraulic fluid temperature

%/10 K

≤ 0.15

Operating pressure

%/100 bar

≤ 0.1
1) The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter.

Hydraulic fluid

Classification

Suitable sealing materials

Standards

Mineral oils and related hydrocarbons

HL, HLP

NBR / FKM

DIN 51524

Flame-resistant   - containing water

HFC (Fuchs HYDROTHERM 46M, Petrofer Ultra Safe 620)

NBR

ISO 12922

Important information on hydraulic fluids:

For more information and data on the use of other hydraulic fluids please contact us.

There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.).

The flash point of the process and operating medium used must be 40 K over the maximum solenoid surface temperature.

Flame-resistant - containing water:
Maximum pressure differential per control edge 175 bar
Pressure pre-loading at the tank port > 20 % of the pressure differential, otherwise increased cavitation
Life cycle as compared to operation with mineral oil HL, HLP 50 % to 100 %

electrical

Size

6 10

Voltage type

Direct voltage

Maximum current consumption

of the amplifier

A

2

of the amplifier (impulse current)

A

3

Solenoid coil resistance

Cold value at 20 °C

Ω

2.65 4.55

Maximum hot value

Ω

4.05 6.82

Actuated time

%

100

Maximum coil temperature 1)

°C

150

Protection class according to DIN EN 60529

IP65 (with mating connector mounted and locked)

Power supply

V

24

Supply voltage range

V

19.4 … 35

Earthing (GND)

V

0

Command value input

"A1"

V

± 10

Command value input range

"F1"

mA

4 … 20

Actual value output

"A1"

V

± 10

Actual value output range

"F1"

mA

4 … 20
1) Due to the surface temperatures occurring at solenoid coils, the European standards ISO 13732-1 and ISO 4413 need to be adhered to.

(measured with HLP46, ϑÖl = 40 ±5 °C)

Zero flow with central control spool position “V32”

NG6

Zero flow with central control spool position “V75”

NG10

Rated flow 4 l/min at a valve pressure differential of 10 bar

NG6

Rated flow 8 l/min at a valve pressure differential of 10 bar

NG6

Rated flow 16 l/min at a valve pressure differential of 10 bar

NG6

Rated flow 32 l/min at a valve pressure differential of 10 bar

NG6

Rated flow 25 l/min at a valve pressure differential of 10 bar

NG10

Rated flow 50 l/min at a valve pressure differential of 10 bar

NG10

Rated flow 75 l/min at a valve pressure differential of 10 bar

NG10

Transition function with stepped electric input signals (4/3 valve version; control spool E)

NG6

Frequency response (4/3 valve version, control spool V)

NG6

Transition function with stepped electric input signals (4/3 valve version; control spool E)

NG10

Frequency response (4/3 valve version, control spool V)

NG10

Load function with maximum valve opening;Rated flow 4, 8, 16 and 32 l/min;Control spool V

NG6

Load function with maximum valve opening;Rated flow 25, 50 and 75 l/min;Control spool V

NG10

Symbols

With symbol E1-, V1- and W1-, the following applies:

P → A: qvmax

B → T: qv/2

P → B: qv/2

A → T: qvmax

Notice:
In the zero position, control spool symbols W and WA have a connection from A → T and from B → T with approx. 3% of the relevant nominal cross-section.

Type 4WREE

Pin assignment

Contact

Assignment interface "A1"

Assignment interface "F1"

Power supply

A

24 VDC (u(t) = 19,4 ... 35 V); Imax = 2 A

B

0 V

Reference potential actual value

C

Reference contact F; Re > 50 kΩ

Reference contact F; Re < 10 Ω

Differential amplifier input (command value)

D

±10 V command value; Re > 50 kΩ

4 ...20 mA command value; Re > 100 Ω

E

Reference potential command value

Measuring output (actual value)

F

± 10V actual value (limit load 5 mA)

4 ... 20 mA actual value; maximum load resistance 300 Ω

PE

connected to cooling element and valve housing

Command value:
Positive command value 0 ... +10 V (or 12 ... 20 mA) at D and reference potential at E cause flow from P → A and B → T.
Negative command value 0 ... –10 V (or 12 ... 4 mA) at D and reference potential at E cause flow from P → B and A → T.
With valves with 1 solenoid on side a (e.g. variant EA and WA), a positive command value 0 ... +10 V (or 4 ... 20 mA) at D and reference potential at E result in flow from P → B and A → T.
Actual value:
Actual value 0 ... +10 V (or 12 ... 20 mA) at F and reference potential at C result in flow from P → A and B → T.
Actual value 0 ... –10 V (or 4 ... 12 mA) result in flow from P → B and A → T.
With valves with 1 solenoid, a positive actual value 0 ... +10V (or 4 ... 20 mA) at F and reference potential at C result in flow from P → B and A → T.
Connection cable: Recommendation:
up to 25 m cable length type LiYCY 7 x 0.75 mm²
up to 50 m cable length type LiYCY 7 x 1.0 mm²
External diameter see sketch of mating connector
Connect shield to PE only on the supply side.

Notice:

Electrical signals provided via control electronics (e. g. actual value) must not be used for switching off safety-relevant machine functions.

1

Material number

2

Production order number

3

Date of production

4

Serial number

5

Type designation

6

Zero point setting

7

Ramp time setting

4WREE 6

Dimensions in mm

1

Valve housing

2

Proportional solenoid "a" with inductive position transducer

3

Proportional solenoid "b"

7

Plug screw for valves with one solenoid (2 spool positions, version "EA" or "WA")

8

Identical seal rings for ports A, B, P, and T

10

Name plate

11

Machined valve contact surface; Porting pattern according to ISO 4401-03-02-0-05 (with locating hole)
Deviating from the standard:
- without locating hole "G"
- ports P, A, B and T with Ø8 mm

12

Integrated electronics (OBE)

13

Mating connector according to DIN EN 175201-804, separate order

Recommended valve mounting screws (separate order):

4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9-flZn-240h-L

tightening torque MA = 7 Nm ± 10%, material no. R913000064 or

4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9

tightening torque MA = 8.9 Nm ± 10%

4WREE 10

Dimensions in mm

1

Valve housing

2

Proportional solenoid "a" with inductive position transducer

3

Proportional solenoid "b"

7

Plug screw for valves with one solenoid (2 spool positions, version "EA" or "WA")

8

Identical seal rings for ports A, B, P and T (T1)

10

Name plate

11

Machined valve contact surface; Porting pattern according to ISO 4401-05-04-0-05
Deviating from the standard:
Port T1 with Ø11.2 mm

12

Integrated electronics (OBE)

13

Mating connector according to DIN EN 175201-804, separate order

Recommended valve mounting screws (separate order):

4 hexagon socket head cap screws ISO 4762 - M6 x 40 - 10.9-flZn-240h-L

tightening torque MA = 12.5 Nm ± 10 %, material no. R913000058 or

4 hexagon socket head cap screws ISO 4762 - M6 x 40 - 10.9

tightening torque MA = 15.5 Nm ± 10%

Mating connectors for valves with round connector, 6-pole + PE

7P Z31

Mating connectors for valves with round connector, 6-pole + PE

7P Z31

For valves with round connector according to EN 175201-804, 6-pole + PE as well as 6-pole, compatible with VG 95328

Data sheet

Spare parts & repair