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BOSCH REXROTH
DB6K3-4X/50YV
R900438027
Pressure Relief Valves

Pressure valves: DB 6 K4x/

$458.33

BOSCH REXROTH

MATERIAL:  R900438027

SUMMARY:  Pressure valves: DB 6 K4x/

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Pressure valves type DB..K.. are pilot-operated pressure relief valves for block design installation. They are used for system pressure limitation. The system pressure can be set via the adjustment type (4).

In the initial position the valves are closed. The pressure in main port 1 acts on the spool (1). At the same time, pressure is applied to the spring-loaded side of the spool (1) via nozzle (2) and to the pilot poppet (6) via nozzle (3). If the pressure in main port 1 exceeds the value set at spring (5), the pilot poppet (6) opens. Hydraulic fluid flows from the spring-loaded side of the spool (1) via nozzle (3) and channel (7) into the main port 3. The resulting pressure drop moves the spool (1) and thus opens the connection from main port 1 to 2 while maintaining the pressure set at spring (5).

Die pilot oil return from the two spring chambers is effected externally, via main port 3.

Notice!

Counter pressures (main port 3) add up to the set pressure.

Type DB 10 K2-4X/.YV

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

01

02

03

04

05

06

07

08

09

DB

K

4X

/

Y

V

*

01

Pressure relief valve, pilot controlled

DB

02

Size 6

6

Size 10

10

03

Cartridge valve

K

Adjustment type

04

Rotary knob

1

Sleeve with hexagon and protective cap

2

Lockable rotary knob with scale

3 1)

Rotary knob with scale

7

05

Component series 40 … 49 (40 … 49: unchanged installation and mounting dimensions)

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

Seal material

08

FKM seals (other seals upon request)

V

Observe compatibility of seals with hydraulic fluid used.

09

Further details in the plain text

*

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

general

Size

6 10

Weight (approx.)

kg

0.15 0.2

Installation position

any

Ambient temperature range

°C

-20 … +80

hydraulic

Size

6 10

Maximum operating pressure 1)

Port P

bar

315

Maximum adm. counter pressure 1)

Port T

bar

315

Port Y

bar

315

Maximum set pressure

Port P

bar

50
100
200
315

Maximum flow

l/min

60 100

Hydraulic fluid

see table

Hydraulic fluid temperature range

°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) Attention! The maximum operating pressure is added up from the set pressure and the return flow pressure.
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 oil

HL, HLP

FKM, NBR

DIN 51524

Bio-degradable

Insoluble in water

HEES (synthetic esters)

FKM

VDMA 24568

HETG (rape seed oil)

FKM, NBR

Soluble in water

HEPG (polyglycols)

FKM

VDMA 24568

Other hydraulic fluids on request

For applications outside these parameters, please consult us!

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

NG6

pE-qV characteristic curves

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

NG6

pE min-qV characteristic curves

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

Attention!

The characteristic curves apply for output pressure = zero in the entire flow range!

NG10

pE-qV characteristic curves

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

NG10

pE min-qV characteristic curves

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/
technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

Main port 1 (P)

Main port 2 (T)

Main port 3 (Y)

NG6

Dimensions in mm

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

1

Adjustment type "1"

2

Adjustment type "2"

3

Adjustment type "3"

4

Adjustment type "7"

5

Space required to remove the key

6

Lock nut SW24

7

Hexagon SW10

8

Wrench size SW24, tightening torque for screw-in MA = 50 Nm

Main port 1 (P)

Main port 2 (T)

Main port 3 (Y)

LS

Location shoulder

Main port 1 (P)

Main port 2 (T), can optionally be arranged at the circumference

Main port 3 (Y)

LS

Location shoulder

NG6; 3 main ports; thread M20 x 1

Dimensions in mm

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

1

Adjustment type "1"

2

Adjustment type "2"

3

Adjustment type "3"

4

Adjustment type "7"

5

Space required to remove the key

6

Lock nut SW24

7

Hexagon SW10

8

Wrench size SW24, tightening torque for screw-in MA = 50 Nm

Main port 1 (P)

Main port 2 (T)

Main port 3 (Y)

LS

Location shoulder

Main port 1 (P)

Main port 2 (T), can optionally be arranged at the circumference

Main port 3 (Y)

LS

Location shoulder

NG10

Dimensions in mm

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

1

Adjustment type "1"

2

Adjustment type "2"

3

Adjustment type "3"

4

Adjustment type "7"

5

Space required to remove the key

6

Lock nut SW24

7

Hexagon SW10

8

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

Main port 1 (P)

Main port 2 (T)

Main port 3 (Y)

LS

Location shoulder

Mounting cavity – NG10; 3 main ports; thread M20 x 1

Dimensions in mm

technical illustration-DB6K3-4X/50YV-Pressure valves: DB 6 K4x/

Main port 1 (P)

Main port 2 (T), can optionally be arranged at the circumference

Main port 3 (Y)

LS

Location shoulder