PRESSURE REDUCING VALVE, PILOT-OPERATED

DR(C)

Material #: R900931191

Model : DRC30-4-5X/315Y/12

For subplate mounting Porting pattern according to ISO 5781 For threaded connection As cartridge valve 4 optional adjustment types:• Rotary knob• Sleeve with hexagon and protective cap• Lockable rotary knob with scale• Rotary knob with scale 5 pressure ratings Check valve, optional (subplate mounting only)

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For subplate mounting Porting pattern according to ISO 5781 For threaded connection As cartridge valve 4 optional adjustment types:• Rotary knob• Sleeve with hexagon and protective cap• Lockable rotary knob with scale• Rotary knob with scale 5 pressure ratings Check valve, optional (subplate mounting only)

Pressure valves type DR are pilot-operated pressure reducing valves controlled from the secondary circuit.

The pressure reducing valves basically consist of the main valve (1) with main spool insert (3) and pilot control valve (2) with pressure adjustment element.

Basic principle:

In rest position, the valves are open. Hydraulic fluid can flow via the main spool insert (3) from channel B to channel A without restrictions. The pressure applied in channel A acts on the bottom of the main spool. Simultaneously, pressure is applied via the nozzle (4) to the spring-loaded side of the main spool (3) and via channel (5) to ball (6) in the pilot control valve (2). Similarly, it acts via nozzle (7), control line (8), check valve (9) and nozzle (10) on the ball (6). Depending on the setting of the spring (11), pressure builds up upstream of the ball (6), in channel (5) and in the spring chamber (12) holding the control spool (13) in open position. The hydraulic fluid in channel B can flow via the main spool insert (3) to channel A without restrictions until a pressure builds up in channel A exceeding the value set at the spring (11) and opening the ball (6). The control spool (13) is moved into closing direction.

The desired reduced pressure is reached if there is a balance between the pressure in channel A and the pressure set at the spring (11).

The pilot oil return from the spring chamber (14) is always realized externally via the control line (15) into the tank.

For the free return flow from channel A to channel B, a check valve (16) can optionally be installed.

A pressure gauge connection (17) enables control of the reduced pressure in channel A.

Type DR..-4-5X/...Y...

01

02

03

04

05

06

07

08

09

10

11

DR

5X

/

Y

*

01

3-way pressure reducing valve

DR

02

Valve complete (subplate mounting or threaded connection)

no code

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

C

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

C

03

Size

Ordering code

Subplate mounting "–"

Threaded connection "G"

10

= 10

= 10 (G1/2)

16

= 15 (G3/4)

25

= 20

= 20 (G1)

25

= 25 (G1 1/4)

32

= 30

= 30 (G1 1/2)

04

As cartridge valve (version "C", without main spool insert)

no code

As cartridge valve (version "C", with main spool insert)

For subplate mounting

For threaded connection

G

Adjustment type for pressure adjustment

05

Rotary knob

4

Sleeve with hexagon and protective cap (always at maximum pressure adjustment)

5

Lockable rotary knob with scale

6 1)

Rotary knob with scale

7

06

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

5X

07

Set pressure up to 50 bar

50

Set pressure up to 100 bar

100

Set pressure up to 200 bar

200

Set pressure up to 315 bar

315

Set pressure up to 350 bar (only version "M")

350

Pilot oil supply

08

Internal pilot oil supply, external pilot oil return

Y

09

With check valve (only for subplate mounting)

no code

Without check valve

M

Seal material

10

NBR seals

no code

FKM seals (other seals upon request)

V

Observe compatibility of seals with hydraulic fluid used.

11

Further details in the plain text

*

1) H-key with material no. R900008158 is included in the scope of delivery.

general

Size

10 16 25 25 32

Type

10 16 (Typ DR...15) 25 (Typ DR..20) 25 (Typ DR...25) 32 (Typ DR...30)

Weight

Subplate mounting

Type DR . .‒

kg

3.4 - 5.3 - 8

Cartridge valve

Type DRC

kg

1.2

Type DRC 30

kg

1.5

Threaded connection

Type DR . .G

kg

5.3 5.2 5.1 5 4.8

Installation position

any

Ambient temperature range

NBR seals

°C

-30 … +50

FKM seals

°C

-20 … +50

hydraulic

Size

10 16 25 32

Maximum operating pressure 1)

Port B

bar

350

Maximum inlet pressure 1)

Port B

bar

350

Maximum outlet pressure 1)

Port …

bar

350

Operating pressure range 1)

Anschluss A

bar

10 … 350

Maximum counter pressure 1)

Port Y

bar

350

Minimum set pressure

flow-dependent, see characteristic curves

Maximum set pressure 1)

bar

50
100
200
315
350

Maximum flow

Subplate mounting

l/min

150 - 300 - 400

Threaded connection

l/min

150 300 400

Hydraulic fluid

see table

Hydraulic fluid temperature range

NBR seals

°C

-30 … +80

FKM seals

°C

-20 … +80

Viscosity range

mm²/s

10 … 800

Maximum admissible degree of contamination of the hydraulic fluid 2)

Class 20/18/15 according to ISO 4406 (c)
1) 350 bar only possible at version without check valve
2) 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, HLPD

NBR, FKM

DIN 51524

Environmentally compatible

Insoluble in water

HETG

NBR, FKM

 

ISO 15380

HEES

FKM

Soluble in water

HEPG

FKM

 

ISO 15380

Containing water

Water-free

HFDU, HFDR

FKM

 

ISO 12922

Containing water

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

 

NBR

ISO 12922

Important information on hydraulic fluids!

For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us! There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)!

Flame-resistant – containing water:

Maximum operating pressure 210 bar Maximum hydraulic fluid temperature 60 °C Expected life cycle as compared to HLP hydraulic oil 30 % to 100 %

For applications outside these parameters, please consult us!

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

Outlet pressure pA dependent on the flow qV (B to A)

Minimum set pressure pAmin dependent on the flow qV (B to A)

The characteristic curves apply to the pressure at the valve outlet pT = 0 bar across the entire flow range.

Δp-qV characteristic curve (B to A; minimum adjustable pressure differential)

Pilot flow dependent on flow (B to A) and pressure differential

Δp-qV characteristic curves via check valve (A to B)

Type DR…YM

Type DR…Y

Type DRC…; cartridge valve

Dimensions in mm

1

Name plate

2.1

Y port for pilot oil return, external

2.2

Port Y optionally for external pilot oil return

3

Adjustment type "4"

4

Adjustment type "5"

5

Adjustment type "6"

6

Adjustment type "7"

7

Hexagon SW10

8

Space required to remove the key

9

Valve mounting bores

10

Seal rings

11

Main spool insert

12

Seal ring

13

Seal ring

14

Seal ring

15

Support ring

16

Support ring

Valve mounting screws (separate order)

4 hexagon socket head cap screws, metric

ISO 4762 - M8 x 40 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 31 Nm ± 10 %,

material no. R913000205

Type DR…; threaded connection

Dimensions in mm

1

Name plate

2.1

Y port for pilot oil return, external

3

Adjustment type "4"

4

Adjustment type "5"

5

Adjustment type "6"

6

Adjustment type "7"

7

Hexagon SW10

8

Space required to remove the key

9

Valve mounting bores

17

Pressure gauge connection

NG

D1

ØD2

T1

mm

mm

10 G1/2 34 14
16 (Typ DR...15) G3/4 42 16
25 (Typ DR..20) G1 47 18
25 (Typ DR...25) G1 1/4 58 20
32 (Typ DR...30) G1 1/2 65 22

Type DR…; subplate mounting

Dimensions in mm

1

Name plate

2.1

Y port for pilot oil return, external

2.2

Port Y optionally for external pilot oil return

3

Adjustment type "4"

4

Adjustment type "5"

5

Adjustment type "6"

6

Adjustment type "7"

7

Hexagon SW10

8

Space required to remove the key

9

Valve mounting bores

17

Pressure gauge connection

18

Identical seal rings for ports A and B

Identical seal rings for ports X and Y

19

Port X without function (blind bore)

20

Locking pin

Subplate mounting:

Subplates (separate order)

Size 10

G 460/01 (G3/8)

G 461/01 (G1/2)

Size 20

G 412/01 (G3/4)

G 413/01 (G1)

Size 30

G 414/01 (G1 1/4)

G 415/01 (G1 1/2)

1

Notice!

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

2

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

3

Nozzle, separate order

Valve mounting screws (separate order)

Size 10

4 hexagon socket head cap screws, metric

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

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 60 Nm ± 10 %,

material no. R913000471

Size 20

4 x ISO 4762 - M10 x 60 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 60 Nm ± 10 %,

material no. R913000116

Size 30

6 x ISO 4762 - M10 x 70 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 60 Nm ± 10 %,

material no. R913000126

NG

L1

L2

L3

L4

L5

L6

L7

L8

L9

L10

B1

B2

B3

B4

B5

H1

H2

H3

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

10 96 35.5 33 42.9 21.5 - 7.2 21.5 31.8 35.8 85 50 66.7 58.8 7.9 112 92 28
16 - - - - - - - - - - - - - - - - - -
25 116 37.5 35.4 60.3 39.7 - 11.1 20.6 44.5 49.2 102 59.5 79.4 73 6.4 122 102 38
25 - - - - - - - - - - - - - - - - - -
32 145 33 29.8 84.2 59.5 42.1 16.7 24.6 62.7 67.5 120 76 96.8 92.8 3.8 130 110 46

Valve mounting screws (separate order)

4 hexagon socket head cap screws, metric

ISO 4762 - M8 x 40 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 31 Nm ± 10 %,

material no. R913000205

Installation bore
Dimensions in mm

Dimensions in mm

1

Notice!

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

2

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

3

Nozzle, separate order

Valve mounting screws (separate order)

Size 10

4 hexagon socket head cap screws, metric

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

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 60 Nm ± 10 %,

material no. R913000471

Size 20

4 x ISO 4762 - M10 x 60 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 60 Nm ± 10 %,

material no. R913000116

Size 30

6 x ISO 4762 - M10 x 70 - 10.9-flZn-240h-L

at friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 60 Nm ± 10 %,

material no. R913000126