PRESSURE CUT-OFF VALVE, PILOT-OPERATED

DAW

Material #: R900929086

Model : DAW20B3-5X/100-17-6EG24N9K4

For subplate mounting As cartridge valve 4 adjustment types, optionally:
• Rotary knob
• Adjustment spindle with protective cap
• Lockable rotary knob with scale
• Rotary knob with scale 4 pressure ratings Solenoid-operated unloading via built-on directional spool valve

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For subplate mounting As cartridge valve 4 adjustment types, optionally:
• Rotary knob
• Adjustment spindle with protective cap
• Lockable rotary knob with scale
• Rotary knob with scale 4 pressure ratings Solenoid-operated unloading via built-on directional spool valve

Type DAW…FS… (freely adjustable switching pressure differential)

The pressure valve type DAW is a pilot-operated pressure cut-off valve. For example, it is used in accumulator charging circuits. Here, an accumulator is filled until the accumulator charging pressure is reached. After reaching the accumulator pressure, the valve switches the flow to depressurized circulation until the pressure in the hydraulic system has fallen by the switching pressure differential. Afterwards, the charging process is started again.

The pressure cut-off valve generally consists of main housing (1), pilot control valve (2 and 3), main spool insert (4) and check valve (7).

Switching of the pump flow from P to B to P to T.

The pump delivers via the check valve (7) into the hydraulic system (P to A). The pressure applied in channel A acts via the control line (8) on the control spool in the pilot control valve (3). Simultaneously, the pressure in channel P is applied via nozzle (5) to the spring-loaded side of the main spool (4) and via the control line (9) and at the inlet (11) of the screw-in cartridge valve (3). As soon as the top cut-off pressure set at the screw-in cartridge valve (3) by means of the adjustment spindle (12) is reached in the hydraulic system, the screw-in cartridge valve opens the connection from the spring-loaded side of the main spool (4) to the return line (10) to T internally (type DAW ...) or externally via port Y (type DAW ...Y).

Due to the nozzle (5), a pressure drop occurs at the main spool (4). It is lifted from the seat and opens connection P to T. The check valve (7) closes the connection from P to A. The actuator pressure A holds the screw-in cartridge valve (3) in open position.

Switching of the pump flow from P to T to P to A.

If the actuator pressure A has fallen to the pressure value set at the adjustment spindle (14), the screw-in cartridge valve (3) switches to initial position and closes the connection from the spring-loaded side of the main spool (4) to the return line (10). This way, the pressure on the spring-loaded side of the main spool (4) is increased and the connection from P to T is closed by the compression spring (6). The pump again delivers via the check valve (7) into the hydraulic system from P to A.

Version "FSB07"

The nozzle of this valve is located in the control line (11) for potential switching shock damping. This way, the circulation pressure (P to T) is increased. See characteristic curves.

Notices!

Only indirect pressure limiting function:

A pressure limiting function of the pump pressure (to the tank) is not directly provided but only indirectly via the check valve (7), control line (8) and pilot control valve (2) to channel T.

Setting the switching pressure differential

At the factory, the valves are set at nominal pressure to a switching pressure differential of approx. 10 % to 12 %. A setting of 50 % of the nominal pressure is possible.

On delivery, the adjustment spindle (12) is screwed out and set to the minimum adjustable switching pressure.

By screwing in the adjustment spindle (12), the top switching pressure may be increased.

The switching pressure differential is adjusted via the adjustment spindle (14): Screw out to reduce, screw in to increase.

The pressure adjustments are secured via the clamping screw (13) and lock nut (15).

Different system conditions (particularly high pump and actuator flows) may lead to higher switching pressures than indicated in the characteristic curves. Here, the valve offers the possibility of optional adjustment of the switching pressure differential to the system.

Type DA 10 -2-5X/.FS…

Type DAW… (fixed switching pressure differential 10 % or 17 %)

The function of this valve complies with the function of version "FS". At the pilot control valve, however, only the top switching pressure and not the switching pressure differential can be set.

The pilot spool surface (16) exceeds the effective ball (17) surface optionally by 10 % or 17 %.

This way, the effective force at the pilot spool (16) exceeds the effective force at the ball (17) by 10 % or 17%.

Switching of the pump flow from P to B to P to T.

The pressure in channel P is applied via nozzles (5) and (9) to the spring-loaded side of the main spool (4) and at ball (17) in the pilot control valve (2). As soon as the cut-off pressure set at the adjustment spindle (12) is reached in the hydraulic system, the ball (17) opens against the spring (18). The hydraulic fluid now flows via nozzles (5) and (9) into the spring chamber (19) to the return line (10) to T (type DAW ...) or externally via port Y (type DAW ...Y). The main spool (4) is lifted from the seat and opens connection P to T. The check valve (7) closes the connection from P to A. Via the pilot spool (16), the actuator pressure A holds the ball in the pilot control valve (2) in open position.

Switching of the pump flow from P to T to P to A.

If the actuator pressure A drops by the switching pressure differential range of 10 % or 17 % in comparison with the set cut-off pressure (according to characteristic curves on page 11), the spring (18) closes the ball (17) in the pilot control valve (2). This way, the pressure on the spring-loaded side of the main spool (4) is increased and the connection from P to T is closed by the compression spring (6). The pump again delivers via the check valve (7) into the hydraulic system from P to A.

Type DA 10 -1-5X/…

The function of this valve complies with the function of valve type DAW …. However, switching can be realized as required from P to T or from P to A by means of solenoid-actuated directional spool valve (20) for pressure below the set cut-off pressure.

Type DAW 20 -1-5X/…6E..K4…

Type DAWC…

Pressure cut-off valve type DAWC 30 …FS…

This valve consists of pilot control housing (2), screw-in cartridge valve (3) as pilot control element and a main spool insert (4).

Pressure cut-off valve type DAWC …10/17...

This valve consists of pilot control valve (2) and an optional main spool insert (4).

Notice for circuit design with type DAC...

The ports required for actuator (A), pump (P) and tank (T), the required control lines (8) and (10) as well as the required check valve (7) are not included in the scope of delivery. These have to be selected according to the applicable size and the flow. Connections require sufficient cross-section and blocking has to be prevented by appropriate design and layout. Between actuator (A) and pump (P), a sufficiently dimensioned check valve with flow characteristics in compliance with or exceeding the characteristic curves specified on page 12 has to be applied.

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

16

17

18

DA

5X

/

*

01

Pressure cut-off valve

DA

02

with attached directional spool valve

W

03

Valve complete (subplate mounting)

no code

Pilot control valve without main spool insert (cartridge valve) (do not enter nominal size)

C 1)

Pilot control valve with main spool insert (cartridge valve) (enter valve size 30)

C

04

Size 10

10

Size 25

20

Size 32

30

05

Symbols

Normally closed

Normally closed

A 2)

Normally open

Normally open

B 2)

Adjustment types

06

Rotary knob

1

Adjustment spindle with protective cap

2

Lockable rotary knob with scale

3 3)

Rotary knob with scale

7

07

Component series 50 … 59 (50 … 59: unchanged installation and connection dimensions)

5X

Pressure adjustment range

08

25 to 50 bar

50

50 to 100 bar

100

100 to 200 bar

200

200 to 315 bar

315

Switching pressure differential (P → A)

09

on average 10 %

10

on average 17 %

17

freely adjustable switching pressure differential (see characteristic curves)

FS 5)

Damping nozzle

6)

10

without nozzle

no code

Nozzle Ø 0.7 mm (see characteristic curves)

B07 7)

11

Pilot oil return, internal

no code

Pilot oil return, external

Y

12

with directional spool valve (high-power valve, data sheet 23178)

6E 1)

13

Direct voltage 24 V

G24 1)

Alternating voltage 230 V, 50/60 Hz

W230 1)

14

With concealed manual override

N9 1)

With manual override

N 1)

Without manual override

no code

Electrical connection

15

without mating connector, individual connection with connector according to DIN EN 175301-803

K41; 4)

Seal material

16

NBR seals

no code

FKM seals (other seals upon request)

V

Observe compatibility of seals with hydraulic fluid used.

17

Further details in the plain text

*

1) Only versions "10" and "17".
2) Ordering code only required for versions with mounted directional spool valve "DAW".
3) H-key with material no. R900008158 is included in the scope of delivery.
4) Mating connectors, separate order.
5)Only with version "2".
6) With nozzle: Switching shock damping leads to increased circulation pressure (P → T)
Without nozzle: Undamped leads to reduced circulation pressure (P → T) (see characteristic curves)
7)Only with version "FS"

Preferred types and standard units are specified in the EPS (standard price list).

general

Size

10 25 32

Weight

Type DAW

kg

5.3 9.2 15

Type DAW …FS

kg

5.8 9.8 15.6

Type DAWC …

kg

2.4

Type DAWC 30 …

kg

2.9

Type DAWC 30 …FS

kg

3.4

Installation position

any

Ambient temperature range

NBR seals

°C

-30 … +50

FKM seals

°C

-20 … +50

hydraulic

Size

10 25 32

Maximum operating pressure

Port P

bar

315

Anschluss A 1)

bar

315

Port T 2) 3)

bar

100

Port Y 2) 3)

bar

100

Set pressure range

Pressure rating 50

bar

25 … 50

Pressure rating 100 4)

bar

50 … 100

Pressure rating 200 4)

bar

100 … 200

Pressure rating 315 4) 5)

bar

200 … 315

Switching pressure differential

Version "FS"

freely adjustable (10 % to 50 % of nominal set pressure)

Version "10" 4)

%

10

Version "17" 4)

%

17

Maximum flow

Version "FS"

l/min

120 250 400

Version "10"

l/min

40 80 120

Version "17"

l/min

60 120 240

Hydraulic fluid

Mineral oil (HL, HLP) according to DIN 51524, other hydraulic fluids on request

Hydraulic fluid temperature range

NBR seals

°C

-30 … +80

FKM seals

°C

-20 … +80

Viscosity range

Maximum

mm²/s

10 … 800

Recommended

mm²/s

20 … 60

Maximum admissible degree of contamination of the hydraulic fluid 6)

Class 20/18/15 according to ISO 4406 (c)
1) (after switching P to T)
2) Attention! The applied pressure adds to the set pressure! The switching pressure differential remains unchanged within the setting range!
3) The tank pressure must not exceed the pump pressure.
4) For switching pressure differential adjustment, the following points must be observed:The top and bottom switching points must be within the setting range of the pressure rating (e.g. for a pressure rating of 100 bar: top switching point 100 bar, bottom switching point 50 bar ≙ 50 % switching pressure differential)– The minimum switching pressure differential mainly depends on the system (set pressure, pump and actuator flow, accumulator size and preload, line length and resistance, etc.) Here, the valve offers the possibility of optional adjustment of the switching pressure differential to the system. For these reasons, however, the minimum adjustable switching pressure differential of the valve cannot always be realized at the system. – Generally: Reduce the tubing between pressure cut-off valve and hydraulic accumulator to a minimum and ensure depressurized pilot oil (Y) discharge as possible. – For the switching pressure differential factory setting, refer to the respective information sheet.
5) Type DA …FS... 150 to 315 bar
6) 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.

For applications outside these parameters, please consult us!

(measured with HLP46, ϑOil = 40 ±5 °C)

Size 10

Circulation pressure dependent on flow qV P and damping (P → T)

Size 25

Circulation pressure dependent on flow qV P and damping (P → T)

Size 32

Circulation pressure dependent on flow qV P and damping (P → T)

Notice!

The flow depends on the set switching pressure differential.

Pressure rating 50 bar

Switching pressure differential (P → A) dependent on the cut-off pressure pO (type DA …)

Pressure rating 100 bar

Switching pressure differential (P → A) dependent on the cut-off pressure pO (type DA …)

Pressure rating 200 bar

Switching pressure differential (P → A) dependent on the cut-off pressure pO (type DA …)

Pressure rating 315 bar

Switching pressure differential (P → A) dependent on the cut-off pressure pO (type DA …)

Switching pressure differential (P → A); pressure adjustment range pU dependent on the cut-off pressure pO (type DA …FS)

Size 10

Δp-qV characteristic curves via check valve (P → A)

Size 25

Δp-qV characteristic curves via check valve (P → A)

Size 32

Δp-qV characteristic curves via check valve (P → A)

Type DAW …

Type DAW …Y…

Normally closed

Normally open

Type DAW …FS…

Type DAW …FS.Y…

Type DAWC 30 …FS…

Type DAWC 30 …FS.Y…

Hydraulic system with hydraulic accumulator

Hydraulic system with high- and low-pressure pump

Application notes:

Reduce the tubing between pressure cut-off valve and hydraulic accumulator to a minimum! In case of high line resistance, use version "DA.../SO80" (separate control line from pilot control valve to hydraulic accumulator)! In case of high pump flow and low switching pressure differential (10 %), version "Y" should be preferred.

Attention!

Accumulators may only be operated with suitable accumulator safety equipment! Version "FS" does not directly provide a pressure limiting function of the pump pressure (to the tank) but only indirectly via the check valve and the control line in the actuator channel. Observe the safety instructions on circuit design!

1

to actuator

2

High-pressure pump

3

Low-pressure pump

Type DAW…FS, NG10; subplate mounting

Dimensions in mm

1

Name plate

2

Y port for pilot oil return, external

4

Adjustment type "2"

5

Adjustment type "3"

8

Hexagon SW10

10

Locking pin

11

Space required to remove the mating connector

 

12

 

Mating connector without circuitry (separate order)

13

Mating connector with circuitry (separate order)

14

Directional spool valve NG6

15

Dimension for solenoid without manual override

16

Dimension for solenoid with manual override “N”

24

Omitted with internal pilot oil return

25

Identical seal rings for ports A, P, T

26

Integrated check valve

28

Valve mounting bores (valve mounting screws, see dimensions)

Valve mounting screws (separate order)

4 hexagon socket head cap screws

ISO 4762 - M10 x 50 - 10.9-flZn-240h-L

Friction coefficient µtotal = 0.09 to 0.14,

Tightening torque MA = 59 Nm ± 10 %,

material no. R913000471

Type DAW…, NG10; subplate mounting

Dimensions in mm

1

Name plate

2

Y port for pilot oil return, external

3

Adjustment type "1"

4

Adjustment type "2"

5

Adjustment type "3"

6

Adjustment type "7"

7

Lock nut SW22

8

Hexagon SW10

9

Space required to remove the key

10

Locking pin

11

Space required to remove the mating connector

12

Mating connector without circuitry (separate order)

13

Mating connector with circuitry (separate order)

14

Directional spool valve NG6

15

Dimension for solenoid without manual override

16

Dimension for solenoid with manual override “N”

24

Omitted with internal pilot oil return

25

Identical seal rings for ports A, P, T

26

Integrated check valve

28

Valve mounting bores (valve mounting screws, see dimensions)

Valve mounting screws (separate order)

4 hexagon socket head cap screws

ISO 4762 - M10 x 50 - 10.9-flZn-240h-L

Friction coefficient µtotal = 0.09 to 0.14,

Tightening torque MA = 59 Nm ± 10 %,

material no. R913000471

Type DAW…FS, NG25 and 32; subplate mounting

Dimensions in mm

1

Name plate

2

Y port for pilot oil return, external

4

Adjustment type "2"

8

Hexagon SW10

11

Space required to remove the mating connector

12

Mating connector without circuitry (separate order)

13

Mating connector with circuitry (separate order)

14

Directional spool valve NG6

15

Dimension for solenoid without manual override

16

Dimension for solenoid with manual override “N”

 

24

 

Omitted with internal pilot oil return

25

Identical seal rings for ports A, P, T

27

Check valve (sandwich plate)

28

Valve mounting bores (valve mounting screws, see dimensions)

Valve mounting screws (separate order)

NG25:

4 hexagon socket head cap screws ISO 4762 - M16 x 100 - 10.9-flZn-240h-L

Friction coefficient µtotal = 0.09 to 0.14,

Tightening torque MA = 200 Nm ± 10 %,

material no. R913000558

2 hexagon socket head cap screws ISO 4762 - M16 x 60 - 10.9-flZn-240h-L

Friction coefficient µtotal = 0.09 to 0.14,

Tightening torque MA = 200 Nm ± 10 %,

material no. R913000031

 

NG32:

4 hexagon socket head cap screws M18 x 120 - DIN 912-10.9

Friction coefficient µtotal = 0.12 to 0.17,

Tightening torque MA = 300 Nm ± 10 %,

material no. R900003282

2 hexagon socket head cap screws M18 x 80 - DIN 912-10.9

Friction coefficient µtotal = 0.12 to 0.17,

Tightening torque MA = 300 Nm ± 10 %,

material no. R900003279

Type DAW…, NG25 and 32; subplate mounting

Dimensions in mm

1

Name plate

2

Y port for pilot oil return, external

3

Adjustment type "1"

4

Adjustment type "2"

5

Adjustment type "3"

6

Adjustment type "7"

7

Lock nut SW22

8

Hexagon SW10

9

Space required to remove the key

11

Space required to remove the mating connector

12

Mating connector without circuitry (separate order)

13

Mating connector with circuitry (separate order)

14

Directional spool valve NG6

15

Dimension for solenoid without manual override

16

Dimension for solenoid with manual override “N”

24

Omitted with internal pilot oil return

25

Identical seal rings for ports A, P, T

27

Check valve (sandwich plate)

28

Valve mounting bores (valve mounting screws, see dimensions)

Type DAWC 30 …FS; cartridge valve

Dimensions in mm

1

Name plate

2

Y port for pilot oil return, external

4

Adjustment type "2"

8

Hexagon SW10

11

Space required to remove the mating connector

12

Mating connector without circuitry (separate order)

13

Mating connector with circuitry (separate order)

14

Directional spool valve NG6

15

Dimension for solenoid without manual override

16

Dimension for solenoid with manual override “N”

17

Identical seal rings for ports A, Y

 

18

 

Main piston

19

O-ring

20

O-ring

21

O-ring

22

Support ring

23

Support ring

28

Valve mounting bores (valve mounting screws, see dimensions)

29

Tightening torque MA = 60 Nm

Valve mounting screws (separate order)

4 hexagon socket head cap screws

ISO 4762 - M8 x 50 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 30 Nm ± 10 %,

material no. R913000543

Type DAWC and DAWC 30; cartridge valve

Dimensions in mm

1

Name plate

2

Y port for pilot oil return, external

3

Adjustment type "1"

4

Adjustment type "2"

5

Adjustment type "3"

6

Adjustment type "7"

7

Lock nut SW22

8

Hexagon SW10

9

Space required to remove the key

11

Space required to remove the mating connector

12

Mating connector without circuitry (separate order)

13

Mating connector with circuitry (separate order)

14

Directional spool valve NG6

15

Dimension for solenoid without manual override

16

Dimension for solenoid with manual override “N”

17

Identical seal rings for ports A, Y

18

Main piston

19

O-ring

20

O-ring

21

O-ring

22

Support ring

23

Support ring

28

Valve mounting bores (valve mounting screws, see dimensions)

Valve mounting screws (separate order)

4 hexagon socket head cap screws

ISO 4762 - M8 x 40 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 30 Nm ± 10 %,

material no. R913000205

Installation bore
Dimensions in mm

Dimensions in mm

1

Bore Ø32 mm can cut into Ø45 mm at any position. However, it must be observed that connection bore A and the mounting bores are not damaged!

2

Support ring and seal rings are to be inserted into this bore before assembly of the main spool!

3

Check valve (separate order). For positioning of the check valve and pilot oil bore, sufficient clearance to the main spool insert is to be ensured.

NG

L1

L2

L3

L4

L5

L6

L7

L8

L9

B1

B2

H1

H2

H3

H4

H5

ØD1

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

25 149 19 101.6 57.1 12.7 46 112.7 15.5 41.5 100 70 154 129 72 46 28 18
32 190 34 127 63.5 12.7 50.8 139.7 26 66.5 116 82.5 175 150 93 67 45 20

NG

L1

L2

L3

L4

L5

L6

L7

L8

L9

B1

B2

H1

H2

H3

H4

H5

ØD1

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

25 149 19 101.6 57.1 12.7 46 112.7 12 42 100 70 144 124 72 46 28 18
32 190 34 127 63.5 12.7 50.8 139.7 22.5 63 115 82.5 165 145 93 67 45 20

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, with rectifier

3P RZ5

Mating connectors for valves with connector “K4”, with rectifier

3P RZ5

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair