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BOSCH REXROTH
R900474528


$453.13 USD
  • BOSCH REXROTH
  • Material:R900474528
  • Model:DR20K4-1X/50YM

Quantity in stock: 0

Note: Sales tax, and shipping will be calculated at checkout.
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth DR 20 K4-1X/50YM (R900474528) is a high-performance screw-in cartridge valve designed for efficient pressure reduction in hydraulic systems. This pilot-operated pressure reducing valve is part of the DR.K product family and is notable for its robust construction, offering maximum operating pressures up to 350 bar (5076 psi) and a nominal flow rate capacity. The valve's primary function is to maintain a consistent reduced pressure in the outlet channel by balancing the force of the spring against hydraulic pressure. The DR 20 K4-1X/50YM features a poppet-type spool that ensures reliable operation in its normally open position, allowing free flow from the inlet to the outlet when at rest. It also includes internal pilot oil supply and external pilot oil return mechanisms, ensuring precise control over the system's pressure levels. The valve can be adjusted using various options such as a rotary knob or a lockable rotary knob with a scale, depending on user preferences for ease of operation and security. Constructed with NBR sealing material and compatible with hydraulic fluids such as HL, HLP, HETG, and HFC, this valve is suitable for diverse hydraulic applications. It can be mounted as a cartridge valve or on a subplate; in the latter configuration, there's an option to install an additional check valve for unidirectional free flow. The Bosch Rexroth DR 20 K4-1X/50YM offers reliable performance under demanding conditions and is engineered to deliver precise pressure control within hydraulic circuits where consistent system pressure reduction is required.


Unpacked Weight: 0.392301 kg

The pressure valve type DR is a pilot-operated pressure reducing valve. It is used to reduce the system pressure.

It mainly consists of screw-in cartridge valve (cartridge) and housing, optionally with or without check valve (subplate mounting only).

In the rest position the valve is open. The hydraulic fluid is able to flow freely from the inlet channel via the main control spool (1) to the outlet channel. The pressure in the outlet channel is applied to the spring-loaded side of the main control spool (1) via the bore (2). At the same time, the pressure acts upon the side of the main control spool (1) that is opposite to the spring via the bores (3) and (4).

If the pressure in the outlet channel exceeds the value set at the spring (6), the pilot poppet (5) opens.

Hydraulic fluid flows from the spring-loaded side of the main control spool (1) via the nozzle (7) and the pilot poppet (5) into the spring chamber (8).

The main control spool (1) assumes its control position and keeps the value in the outlet channel set at the spring (6) constant. The pilot oil return from the spring chamber (8) is always realized externally via the Y port (9).

In subplate mounting version "P", a check valve (10) can be optionally installed for free return flow from channel A to B.

Type DR 10 -4-4X/…

technical illustration-R900474528-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 4 pressure ratings

Type DR 20 G-4-4X/…

technical illustration-R900474528-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 4 pressure ratings

Notice!

The pressure in port Y is added 1:1 to the set reduced pressure.

Screw-in cartridge valve
Maximum operating pressure 315 bar (4568 psi)
Maximum flow 160 l/min (42 gpm)
Cavity M28x1,5
Max. pressure315
Adjustment optionsRotary knob
Product family classificationPressure reducing valve, pilot operated
Productgroup ID9,10,11,12,13,14
Product family typeDR.K
Ports number3
Sealing materialNBR
CavityM28x1,5
Product typeDR.K
Max. flow160
Type of connectionScrew-in cartridge valve
Normal positionNormally open
Nominal flow160
Direct - PilotPilot operated
Product familyReducing
Pilot oil supply and returnInternal pilot oil supply, external pilot oil return
Spool PoppetPoppet type
PortsG 1
Weight0.392301
Hydraulic fluidHL,HLP,HETG,HFC

01

02

03

04

05

06

07

08

09

10

DR

–

–

/

Y

*

01

Pressure reducing valve

DR

02

Size 10

Subplate mounting "no code"

10

Threaded connection "G" (G1 1/2)

10

Size 25

Subplate mounting "no code"

20

Threaded connection "G" (G3/4)

15

Threaded connection "G" (G1)

20

Screw-in cartridge valve "K"

20

03

Subplate mounting

no code

Threaded connection

G

Cartridge valve

K

Adjustment type

04

Rotary knob

4

Sleeve with hexagon and protective cap

5

Lockable rotary knob with scale

6 1)

Rotary knob with scale

7

05

Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions); (03 = "K")

1X

Component series 40 ... 49 (40 ... 49: unchanged installation and connection dimensions); (03 = "no code" and "G")

4X

Pressure rating

06

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

07

Internal pilot oil supply, external pilot oil return

Y

08

With check valve (subplate mounting only)

no code

Without spring return

M

Seal material

09

NBR seals

no code

FKM seals

V

Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)

10

Further details in the plain text

*

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

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

general

Size

10 25

Weight

Subplate mounting

kg

3.2 3.5

Cartridge valve

kg

2.5 2.8

Threaded connection

kg

3.6 3.3

Installation position

any

Ambient temperature range

NBR seals

°C

-30 … +80

FKM seals

°C

-20 … +80

hydraulic

Size

10 25

Nominal pressure

bar

315

Maximum operating pressure

Inlet

bar

315

Maximum secondary pressure

Outlet

bar

50
100
200
315

Maximum counter pressure

Port Y

bar

250

Set pressure

Minimum

flow-dependent, see characteristic curves

Maximum

bar

50
100
200
315

Maximum flow

Subplate mounting

l/min

80 160

Threaded connection

l/min

80 160

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 1)

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

HL,HLP

NBR, FKM

DIN 51524

Bio-degradable

Insoluble in water

HETG

NBR, FKM

VDMA 24568

HEES

FKM

Soluble in water

HEPG

FKM

VDMA 24568

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.)! The flash point of the hydraulic fluid used must be 40 K higher than the maximum surface temperature.

Flame-resistant – containing water:

The maximum pressure differential per control edge is 210 bar. Otherwise, there is increased cavitation erosion. Maximum hydraulic fluid temperature 60 °C Life cycle as compared to operation with mineral oil HLP 30 to 100 %

For applications outside these parameters, please consult us!

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

Minimum adjustable output pressure P dependent on the flow qV (B to A)

technical illustration-R900474528-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 4 pressure ratings

Pilot flow qV st dependent on the flow qV (B to A) and the pressure differential Δp

technical illustration-R900474528-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 4 pressure ratings

Δpmin-qV characteristic curve (B to A)

technical illustration-R900474528-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 4 pressure ratings

Δp-qV characteristic curve (B to A)

technical illustration-R900474528-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 4 pressure ratings

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

Subplate mounting

technical illustration-R900474528-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 4 pressure ratings

Type DR . .-.-4X/.YM, Type DR . K-.-1X/.YM (screw-in cartridge valve)

Subplate mounting, screw-in cartridge valve

technical illustration-R900474528-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 4 pressure ratings

Type DR . G-.-4X/.YM

Threaded connection

technical illustration-R900474528-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 4 pressure ratings

Subplate mounting

Dimensions in mm

technical illustration-R900474528-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 4 pressure ratings

Subplate mounting

Dimensions in mm

technical illustration-R900474528-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 4 pressure ratings

1

Adjustment type "4"

2

Adjustment type "5"

3

Adjustment type "6"

4

Adjustment type "7"

5

Lock nut SW22

6

Hexagon SW10

7

Hexagon SW30, tightening torque for screw-in MA = 50 Nm

8

Space required to remove the key

9

Locking pin

10

Valve mounting bores

11

Name plate

12

Identical seal rings for ports A and B

13

Seal ring for port Y

Type

L1

L2

L3

L4

L5

L6

B1

B2

B3

B4

H1

H2

H3

H4

ØD1

ØD2

ØD3

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

DR10 95.5 79 42.9 23 2.5 21.5 85 49 66.7 7.9 71 60 26 26 35.5 21.8 15
DR20 96 79.5 60.3 7 4 39.7 100 58 79.4 6.4 96 78 26 40 41 34.8 25

Threaded connection "G"

Dimensions in mm

technical illustration-R900474528-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 4 pressure ratings

1

Adjustment type "4"

2

Adjustment type "5"

3

Adjustment type "6"

4

Adjustment type "7"

5

Lock nut SW22

6

Hexagon SW10

7

Hexagon SW30, tightening torque for screw-in MA = 50 Nm

8

Space required to remove the key

10

Valve mounting bores

11

Name plate

14

Y port for pilot oil return

Type

D1

ØD2

mm

DR 10G G1/2 34
DR 15G G3/4 42
DR 20G G1 47

Notice!

In this valve version, no check valve for free return flow is installed in the valve.

Screw-in cartridge valve "K"

Dimensions in mm

technical illustration-R900474528-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 4 pressure ratings

1

Adjustment type "4"

2

Adjustment type "5"

3

Adjustment type "6"

4

Adjustment type "7"

5

Lock nut SW22

6

Hexagon SW10

7

Hexagon SW30, tightening torque for screw-in MA = 50 Nm

8

Space required to remove the key

15

Seal ring

16

Support ring

Mounting cavity

Dimensions in mm

technical illustration-R900474528-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 4 pressure ratings

Notice!

Optionally, the connection bores A, B and Y can be applied at the circumference.

Subplates (separate order)

Size 10:

G 460/01 (G3/8)

G 461/01 (G1/2)

Size 25:

G 412/01 (G3/4)

G 413/01(G1)

Valve mounting screws (separate order)

Size 10:

4 hexagon socket head cap screws ISO 4762 - M10 x 40 - 10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

Tightening torque MA = 75 Nm ± 10 %

Size 25:

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 = 75 Nm ± 10 %

Notice!

The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %).