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DBDS 6 K1X/315

Pressure relief valve, direct controlled
Size 6 … 30
Component series 1X
Maximum operating pressure 630 bar
Maximum flow 350 l/min
Availability:
Quantity:
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  • DBDS 6 K1X/315

  • Rexroth

  • R900423725

  • As screw-in cartridge valve (cartridge)

  • For threaded connection

  • For subplate mounting

  • Adjustment type for pressure adjustment, optionally: 
    ‒ Sleeve with hexagon and protective cap 
    ‒ Rotary knob 
    ‒ Hand wheel 
    ‒ Lockable rotary knob

  • Corrosion-protected design



Pressure relief valves of type DBD are direct operated seat valves. They are used for limiting a system pressure.

The valves basically consist of sleeve (1), spring (2), poppet with damping piston (3) (pressure rating 25 bar … 400 bar) or ball (4) (pressure rating 630 bar) and adjustment type (5). The system pressure can be set steplessly via the adjustment type (5). The spring (2) pushes the poppet (3) or the ball (4) onto the seat. Channel P is connected to the system. The pressure existing in the system acts on the poppet surface (or the ball). If the pressure in channel P exceeds the value set at the spring (2), the poppet (3) or the ball (4) opens against the spring (2). Now, hydraulic fluid from channel P flows into channel T. The stroke of the poppet (3) is limited by the embossing (6).

In order to achieve good pressure adjustment over the entire pressure range, the entire pressure range has been divided into 7 pressure ratings. One pressure rating corresponds to a certain spring for a maximum operating pressure that can be set by means of that spring.

Type DBDS..K1X/…

Version pressure rating 25 … 400 bar (poppet seat valve)

Type DBDH 10 K1X/…

Version pressure rating 630 bar (ball seat valve, only NG10)

Notices:

  • The adjustment type (5) is constructed so that it cannot be lost. Due to the gimbal-mounting, the adjustment element remains loose (movable) in the adjustment type (5) in case of complete unloading.

  • Pressure rating “25”: If despite completely unloaded adjustment type, the minimum pressure does not settle, the adjustment element has to be “pulled back” to the stop due to the low spring and/or restoring force.

  • For pressure adjustment / increase, the adjustment element can then be screwed in again.



01

02

03

04

05

06

07

08

09


10

11

12

13

14

15

16

17

18

19

20

21

22

DB








5X

/













*

01

Pressure relief valve

DB

02

Without directional valve

no code

03

Pilot-operated valve (complete)

no code

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

C

Pilot control valve with main spool insert (enter size 10 or 30)

C

Pilot control valve without main spool insert for subplate mounting (do not enter any size)

1)

04

Size 10

Subplate mounting "no code"

10

Threaded connection "G"

10 (G1/2)

Size 16

Threaded connection "G"

15 (G3/4)

Size 25

Subplate mounting "no code"

20

Threaded connection "G"

20 (G1)

Threaded connection "G"

25 (G1 1/4)

Size 32

Subplate mounting "no code"

30

Threaded connection "G"

30 (G1 1/2)

05

Without directional valve

no code

Type of connection

06

Subplate mounting or cartridge valve

no code

For threaded connection

G

Adjustment type for pressure adjustment

07

Rotary knob (not for version "C" and "T")

1

Sleeve with hexagon and protective cap

2

Lockable rotary knob with scale

2)

Rotary knob with scale

7

08

Main spool Ø24 mm (all sizes)

Main spool Ø28 mm (only for NG32)

N

09

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

5X

10

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

350

Pilot oil flow

11

External pilot oil supply, internal pilot oil return

X 3)

Internal pilot oil supply, external pilot oil return

Y

Pilot oil supply and pilot oil return external

XY 3)

12

Standard version

no code

Valve for minimum cracking pressure (not for versions "without main spool insert" and not suitable for mutual relief)

4)

13

Without switching shock damping

no code

14

Without directional valve

no code

15

Without directional valve

no code

16

Without manual override

no code

Electrical connection

17

Without directional valve

no code

18

Without directional valve

no code

Corrosion resistance

19

None

no code

Improved corrosion protection (240 h salt spray test according to EN ISO 9227)

J3 5)

Seal material

20

NBR seals

no code

FKM seals

V

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

Equipment Directive

21

Without type-examination procedure

no code

Type-examination tested safety valve according to Pressure Equipment Directive 2014/68/EU

E

22

Further details in the plain text

*

1) DBT corresponds to DBC, however with closed central bore
2) H-Key with material no. R900008158 is included in the scope of delivery.
3) Not with version "DBC"
4) Only possible up to pressure rating 315 bar
5) Only version "2", however without protective cap

Type-examination tested safety valves type DB…E

(Component series 5X according to Pressure Equipment Directive 2014/68/EU)

NG

Type designation

Component marking

Maximum flow qVmaxin l/min with pilot oil return

Set response overpressure p in bar

external "Y"

internal "–"

10

TÜV.SV.▢ – 851.12.F.G.p

170

230

230

230

130

200

200

200

30 ... 60

61 ... 110

111 ... 210

211 ... 350

25

TÜV.SV.▢ – 852.22.F.G.p

250

270

420

450

180

210

320

400

30 ... 60

61 ... 110

111 ... 210

211 ... 350

32

TÜV.SV.▢ – 853.32.F.G.p

600

600

650

700

225

340

540

580

30 ... 60

61 ... 110

111 ... 210

211 ... 350

1

For subplate mounting

no code

For threaded connection

G

Adjustment type for pressure adjustment

2

Hand wheel (pressure adjustment sealed, unloading or setting of a lower response pressure possible!)

1

With sealed protective cap (no adjustment/unloading possible)

2

Pressure

3

To be entered by the customer, e.g. pressure adjustment ≥ 30 bar and possible in 5 bar steps.

e.g. 150

Pilot oil flow

4

Pilot oil supply internal, pilot oil return internal

no code

Pilot oil supply internal, pilot oil return external (Recommendation)

1)

5

NBR seals

no code

FKM seals

V

Value entered at the factory

1) Pilot oil supply external "X" not possible



(For applications outside these values, please consult us!)

general

Size

681015202530

Weight



See dimensions

Installation position



any

Ambient temperature range

NBR seals

°C

-30 … +80

FKM seals

°C

-15 … +80

Minimum stability of the housing materials



Housing materials are to be selected so that there is sufficient safety for all imaginable operating conditions (e.g. with regard to pressure resistance, thread stripping strengths and tightening torques).

hydraulic

Size

681015202530

Maximum operating pressure

Inlet

bar

400630400315

Outlet

bar

315

Maximum flow (standard valves)



See characteristic curves

Hydraulic fluid



see table

Hydraulic fluid temperature range

NBR seals

°C

-30 … +80

FKM seals

°C

-15 … +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

Data sheet

Mineral oils

HL, HLP, HLPD, HVLP, HVLPD

NBR, FKM

DIN 51524

90220

Bio-degradable

Insoluble in water

HETG

NBR, FKM

ISO 15380

90221

HEEG

FKM

Soluble in water

HEPG

FKM

ISO 15380

Important information on hydraulic fluids:

  • For further information and data on the use of other hydraulic fluids, please refer to the data sheets above or contact us.

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

  • The ignition temperature of the hydraulic fluid used must be 50 K higher than the maximum surface temperature.

  • Bio-degradable and flame-resistant: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.

Notice:

Hydraulic counter pressures in port T add 1:1 to the response pressure of the valve set at the adjustment type.

Example:

  • Pressure adjustment of the valve due to spring pretensioning (see "Product description" item 2) pspring200 bar

  • Hydraulic counter pressure in port T: phydraulic = 50 bar

  • ⇒ Response pressure = pspring + phydraulic = 250 bar

Deviating technical data: Type-examination tested safety valves type DBD

(Component series 1X, according to Pressure Equipment Directive 2014/68/EU)

 

general

Ambient temperature range

°C

-10 … +80

hydraulic

Set response pressure


see last figure of the component marking

Maximum counter pressure in the discharge line


See characteristic curves "Counter pressure in the discharge line”

Maximum flow


The last but one figure of the component marking attached at the safety valve is always binding. For valve types which have a variable maximum flow depending on the response pressure, the discharge coefficient is specified at this place.

Hydraulic fluid


Hydraulic fluids according to DIN 51524: Hydraulic oils HL and HLP are suitable for safety valves with NBR or FKM seals.

Hydraulic fluid temperature range


-10 … +60 °C

Viscosity range


12 … 230 mm²/s



Threaded connection "G"

(dimensions in mm)

Dimensions in mm

1.1

Adjustment type "S” (example)

Grub screw with hexagon and protective cap;

Internal hexagon (NG6 … NG20)

External hexagon (NG25 and 30)

2

Name plate

3

4 valve mounting bores

4

Additional port (P), optional (e.g. for pressure measurement); not possible for NG10 and pressure rating > 400 bar (= version “SO292”).

Dimensions see dimensions D4, tightening torque see table.

NG

B1

B2

ØD1

D2

ØD3

D4

H1

H2

L1

L2

L3

L4

L5

L6

T1

T2

mm

mm

mm


mm


mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

6 45 60 25 M6 6.6 G1/4 25 40 80 4 15 55 40 20 10 12
8 60 80 28 M8 9 G3/8 40 60 100 4 20 70 48 21 15 12
10 60 80 34 M8 9 G1/2 40 60 100 4 20 70 48 21 15 14
15 70 100 42 M8 9 G3/4 50 70 135 4 20 100 65 34 18 16
20 70 100 47 M8 9 G1 50 70 135 5.5 20 100 65 34 18 18
25 100 130 56 M10 11 G1 1/4 60 90 180 5.5 25 130 85 35 20 20
30 100 130 65 M10 11 G1 1/2 60 90 180 5.5 25 130 85 35 20 22

NG

Tightening torques Min Nmfor fittings

1)

Weight, approx. in kg

Plug screw (4)

Pipe fittings

6

30 Nm

60 Nm

1,5 Kg

8

40 Nm

90 Nm

3,7 Kg

10

60 Nm

130 Nm

3,7 Kg

15

80 Nm

200 Nm

6,4 Kg

20

135 Nm

380 Nm

6,4 Kg

25

480 Nm

500 Nm

13,9 Kg

30

560 Nm

600 Nm

13,9 Kg

1) The tightening torques are guidelines, referring to the maximum operating pressure and when using a manual torque wrench (tolerance ±10 %).

Screw-in cartridge valve "K"

(dimensions in mm)

Dimensions in mm

Cartridge valve

Dimensions in mm

1.1

Adjustment type "S” – Grub screw with hexagon and protective cap; internal hexagon (NG6 … NG20), external hexagon (NG30)

1.2

Adjustment type “H” – rotary knob (NG6 … NG20), hand wheel (NG30)

1.3

Adjustment type "A” – lockable rotary knob NG6 … NG10 (NG20 …100 bar)

4

Port P, at any place at the circumference or at the front side

5

Port T, at any place at the circumference

6

Type designation

7

Pressure rating (stamped in)

8

Marking (adjustment of the zero position after the valve has been screwed in; then fixing of the ring by horizontal shifting until it engages on the plug screw SW6).

9

Depth of fit

10

Lock nut, tightening torque MA = 10+5 Nm

11

Space required to remove the key

12

Minimum stability of the housing materials, see "Technical data".

1)

Maximum dimension

2)

All seal ring in sertion faces are rounded and free of burrs; tolerance for all angles ± 0.5°

Cartridge valve

NG

ØD11

ØD12

ØD13

L17

L18

L19

L20

L21

L22

L23

L24

SW1

SW2

SW3

SW4

SW5

SW6

Weight (approx.)

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

kg

6 34 60 - 72 11 83 28 20 - - 64.5 32 30 19 6 - 30
-
0.4
8 - - - - - - - - - - - - - - - - -
-

10 38 60 - 68 11 79 28 20 - - 77 36 30 19 6 - 30
-
0.5
15 - - - - - - - - - - - - - - - - -
-

20 48 60 - 65 11 77 28 20 - - 106 46 36 19 6 - 30
-
1
25 - - - - - - - - - - - - - - - - -
-

30 63 - 80 83 - - - - 11 56 131 60 46 19 - 13 -
-
2.2

Tightening torques MA in Nm for screw-in cartridge valves

NG

Pressure rating in bar

Up to 200

Up to 400

Up to 630

6

50±5

80±5

10

100±5

150±10

200±10

20

150±10

300±15

30

350±20

500±30

The tightening torques are guidelines with a friction coefficient μtotal = 0.12 and when using a manual torque wrench.

Mounting cavity

NG

D14

ØD15

ØD16

ØD17

ØD18

ØD19

L25

L26

L27

L28

L29

L30

L31

α1


mm


mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

°

6 M28 x 1.5 25 H9
-
6 15 24.9 + 0.15
- 0.2
12 15 19 30 36 45 56.5 ± 5.5 65 15
8 - - -
-
- - - -
-
- - - - - - - - - -
10 M35 x 1.5 32 H9
-
10 18.5 31.9 + 0.16
- 0.2
15 18 23 35 41.5 52 67.5 ± 7.5 80 15
15 - - -
-
- - - -
-
- - - - - - - - - -
20 M45 x 1.5 40 H9
-
20 24 39.9 + 0.16
- 0.2
22 21 27 45 55 70 91.5 ± 8.5 110 20
25 - - -
-
- - - -
-
- - - - - - - - - -
30 M60 x 2 55 H9
-
30 38.75 54.9 + 0.17
- 0.2
34 23 29 45 63 84 113.5 ± 11.5 140 20

Subplate mounting "P"

((dimensions in mm)

Subplate mounting

Dimensions in mm

Dimensions in mm

1.1

Adjustment type "S” – Grub screw with hexagon and protective cap; internal hexagon (NG6 … NG20), external hexagon (NG30)

2

Name plate

4

Additional port (P), optional (e.g. for pressure measurement); not possible for NG10 and pressure rating > 400 bar (= version “SO292”). Tightening torques see dimensional table)

15

Locking pin (only with type-examination tested safety valves)

For reasons of stability, use exclusively the following valve mounting screws (separate order):

4 hexagon socket head cap screws ISO 4762...-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14)

NG

Dimensions

Property class

MA in Nm

1)

Material number

6

M6 x 50

10.9

12,5 Nm

R913000151

10

M8 x 70

10.9

28 Nm

R913000149

20

M8 x 90

12.9

28 Nm

R913000150

30

M10 x 110

12.9

56 Nm

R913000148

1) For tightening, use a manual torque wrench with a tolerance ≤10 %.

NG

B1

B2

ØD3

H2

L1

L2

L3

L4

L5

L6

L18

Port P

Weight (approx.)

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm


kg

6 45 60 6.6 40 80 4 15 55 40 20 15 G1/4 1.5
10 60 80 9 60 100 4 20 70 45 21 15 G1/2 3.7
20 70 100 9 70 135 5.5 20 100 65 34 15 G3/4 6.4
30 100 130 11 90 180 5.5 25 130 85 35 15 G1 1/4 13.9

Deviating dimensions: Cartridge valve as type-examination tested safety valve type DBD

(Component series 1X, according to Pressure Equipment Directive 2014/68/EU) (dimensions in mm)

Dimensions in mm

1.2

Adjustment type “H” – rotary knob (NG6 … NG20), hand wheel (NG30)

1.4

Adjustment type "S" – hexagon with safety cap

4

Port P, at any place at the circumference or at the front side

6

Type designation

7

Pressure rating (stamped in)

10

Lock nut, tightening torque MA = 10+5 Nm

1)

Maximum dimension with lowest set response pressure

2)

The tightening torques are guidelines with a friction coefficient μtotal = 0.12 and when using a manual torque wrench.

NG

ØD11

ØD12

ØD13

L17

L18

L19

L22

L23

L24

SW1

SW2

SW3

Weight (approx.)

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

kg

6 34 60 - 80 11 83 - - 64.5 32 30 19 0.4
8 - - - - - - - - - - - -
10 38 60 - 76 11 79 - - 77 36 30 19 0.5
15 - - - - - - - - - - - -
20 48 60 - 73 11 77 - - 106 46 36 19 1
25 - - - - - - - - - - - -
30 63 - 80 91 - - 11 56 131 60 46 19 2.2

Tightening torques MA in Nm for screw-in cartridge valves

NG

Pressure rating in bar

Up to 200

Up to 400

Up to 630

6

50±5

80±5

10

100±5

150±10

200±10

20

150±10

300±15

30

350±20

500±30

The tightening torques are guidelines with a friction coefficient μtotal = 0.12 and when using a manual torque wrench.

Sheet cut-out for front panel mounting with type-examination tested safety valves type DBD

(Component series 1X, according to Pressure Equipment Directive 2014/68/EU) (dimensions in mm)

Notice:

With valves type DBDH.K..1X/..E, the hand wheel must be removed and reassembled before the front panel assembly of the screw-in cartridge valve.

Threaded connection

Dimensions in mm

NG

B1

B2

H1

H2

ØD1

ØD2

R1

mm

mm

mm

mm

mm


mm


mm

6 45 12.5 25 22.5 7 H13 40 H13 8
8








10 60 20.5 40 20.5 9 H13 44 H13 8
15








20 70 24 50 24 9 H13 55 H13 8
25








30 100 29.5 60 29.5 11 H13 73 H13 8

2) The tightening torques are guidelines with a friction coefficientμtotal = 0.12 and when using a manual torque wrench.

1) Component series 1X, according to Pressure Equipment Directive97/23/EC

1) As replacement, you can also use specified screws according to DIN 912.

2) For tightening, use a manual torque wrench with a tolerance ≤10 %.



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