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R900535930 - Pressure relief valve, pilot controlled - BuyRexroth

Pressure relief valve, pilot controlled

Material #: R900535930

$700.00

For subplate mounting Porting pattern according to ISO 6264-06-09 (NG10), ISO 6264-08-13 (NG25) and ISO 6264-10-17 (NG32) For threaded connection As screw-in cartridge valve (cartridge) 4 adjustment types for pressure adjustment, optionally
• Rotary knob
• Sleeve with hexagon and protective cap
• Lockable rotary knob with scale
• Rotary knob with scale 5 pressure ratings Corrosion-protected design

Product lead time: 84 days

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Pressure valve type DB is a pilot-operated pressure relief valve. It is used for limiting the operating pressure.

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

 

The pressure applied to channel P acts on the main spool (3). At the same time, pressure is applied to the spring-loaded side of the main spool (3) and to the ball (8) in the pilot control valve (2) via the control lines (6) and (7) which are equipped with nozzles (4) and (5). If the pressure in channel P exceeds the value set at the spring (9), the ball (8) opens against the spring (9). The corresponding signal comes internally, via the control lines (10) and (6) from channel P. The hydraulic fluid on the spring-loaded side of main spool (3) now flows via the control line (7), nozzle bore (11) and ball (8) into the spring chamber (12). From here, it is fed into the tank, either internally for type DB …– via control line (13), or externally for type DB…Y via control line (14). Nozzles (4) and (5) cause a pressure drop to occur at the main spool (3), hence the connection from channel P to channel T opens. Now, the hydraulic fluid flows from channel P to channel T maintaining the set operating pressure.

The pressure relief valve can be unloaded or switched to another pressure (second pressure rating) via port X (15).

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)

T 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

3 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)

U 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 qVmax in l/min with pilot oil return

Set response overpressurep 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)

Y 1)

5

NBR seals

no code

FKM seals

V

Value entered at the factory

1) Pilot oil supply external "X" not possible

general

Size

10 16 25 32
DB.. 15 DB.. 20 DB.. 25

Weight

Subplate mounting

DB...

kg

2.6 - 3.5 - 4.4

DBC...

kg

1.2

DBC 10 or 30 ...

kg

1.5

Threaded connection

DB...G

kg

5.3 5.2 5.1 5 4.8

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

10 16 25 25 32

Maximum operating pressure

Port P

bar

350

Port X

bar

350

Port T

bar

315

Maximum counter pressure

Port Y (DC solenoid)

bar

315

Minimum set pressure

flow-dependent, see characteristic curves

Maximum set pressure

bar

50
100
200
315
350

Maximum flow

Subplate mounting

l/min

250 - 500 - 650

Threaded connection

l/min

250 500 650

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.

Note:

Tank preloading adds to the minimum set pressure (ports T and Y)

Hydraulic fluid

Classification

Suitable sealing materials

Standards

Data sheet

Mineral oils

HL, HLP

NBR, FKM

DIN 51524

90220

Bio-degradable

1)

Insoluble in water

HETG

FKM

ISO 15380

90221

HEES

FKM

Soluble in water

HEPG

FKM

ISO 15380

Flame-resistant

Water-free

HFDU (glycol base)

FKM

ISO 12922

90222

HFDU (ester base)

1)

FKM

Containing water

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

NBR

ISO 12922

90223

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 solenoid surface temperature. Flame-resistant – containing water: Maximum operating pressure 210 bar Life cycle as compared to operation with mineral oil HL, HLP 30 … 100 % Maximum hydraulic fluid temperature 60 °C Bio-degradable and flame-resistant: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.
1) Not recommended for corrosion-protected version “J3”

Deviating technical data: Type-examination tested safety valves type DB…E

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

hydraulic

Version

Pilot oil flow "no code" Pilot oil flow "Y"

Maximum counter pressure

Port Y

bar

- 0

Port T

See characteristic curves and explanatory notes for maximum counter pressure PT < 15

Maximum flow

See ordering code, safety instructions and characteristic curves "Type-examination tested safety valve"

Hydraulic fluid

Mineral oil (HL, HLP) according to DIN 51524 and DIN 51524-1

Hydraulic fluid temperature range

-10 … +60 °C

Viscosity range

mm²/s

12 … 230

For applications outside these parameters, please consult us!

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

Standard version

Minimum set pressure and circulation pressure dependent on the flow 1)

1) The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.

Version “U”

Minimum set pressure and circulation pressure dependent on the flow 1)

Inlet pressure dependent on the flow

Notice:

The characteristic curves were measured with external, depressurized pilot oil return.

Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port T.

Pilot flow

Type-examination tested safety valves

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

Counter pressure in the discharge line

Basically, the valve should be operated without counter pressure in the discharge line, if possible. With counter pressure in the discharge line, the maximum flow possible is reduced. There is a relation between the maximum counter pressure pT in the discharge line and flow qV, which can be seen from the following characteristic curves. Characteristic curves for intermediate values of the response pressure which are not listed must be determined by means of interpolation.

With a flow approaching zero, the maximum counter pressure pT is in each case 10 % of the response pressure. With increasing flow, the maximum counter pressure pT is reduced.

 

Interpolation of intermediate values from the diagram

At the pT axis, mark 1/10 of the value of pA. Determine the next lower and the next higher characteristic curve for this point. The point marked at pT divides the section between lower and higher characteristic curve on the pT axis with a certain percentage. At the qVmax axis, divide the section between next lower and next higher characteristic curve in the same percentage as the section at the pT axis. From the zerocrossing on the qVmax axis determined in that way, draw a straight line to the value on the pT axis marked before. Mark the system flow to be secured at the qVmax axis. Read off the maximum counter pressure for this value using the line at the pT axis drawn before.

 

Determination of the maximum counter pressure

Example 1 (with already existing characteristic curve):

Flow of the system / accumulator to be secured:qVmax = [si]300 l/min[/si][imp]79.3 USgpm[/imp Safety valve set to: pA = [si]80 bar[/si][imp]1150 psi[/imp]. Read off the maximum counter pressure pT of approx. [si]12 bar[/si][imp]175 psi[/imp] from the diagram (see arrows, dashed line " ").

 

Example 2 (with interpolated characteristic curve):

Flow of the system / accumulator to be secured: qVmax = [si]300 l/min[/si][imp]79.3 USgpm[/imp Safety valve set to: pA = [si]80 bar[/si][imp]1150 psi[/imp] Value to be marked at the axis referred to as pT: 1/10 x [si]80 bar[/si][imp]1150 psi[/imp] = [si]8 bar[/si][imp]115 psi[/imp]. Read off the maximum counter pressure pT of approx. [si]1 bar[/si][imp]15 psi[/imp] from the diagram (see arrows, dashed/dotted line " ").

 

Size 10

Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DB(W)...E with different response pressures pA.Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".

Size 20

Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DB(W)...E with different response pressures pA.Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".

Size 30

Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the flow qVmax for valves type DB(W)...E with different response pressures pA.Intermediate values may be determined by means of interpolation. Regarding the procedure for interpolation refer to "Interpolation of intermediate values from the diagram".

pA

Response pressure in bar

pT

Maximum counter pressure in the discharge line (port T) in bar

(sum of all possible counter pressures; also see AD2000 data sheet - A2)

pT max

10% x pA (with qV=0 l/min) according to Pressure Equipment Directive 2014/68/EU

qV max

Maximum flow in l/min

Type DB…–…

Type DB…X…

Type DB…Y…

Type DB…XY…

Threaded connection "G"

Dimensions in mm

1

Name plate

2

X port for pilot oil supply, external

3

Y port for pilot oil return, external

4

Adjustment type "1"

5

Adjustment type "2"

6

Adjustment type "3"

7

Adjustment type "7"

8

Hexagon SW10

9

Space required to remove the key

11

Valve mounting bores

19

Omitted with internal pilot oil return

Version

D1

ØD2

T1

mm

mm

"DB 10 G" G1/2 34 14
"DB 15 G" G3/4 42 16
"DB 20 G" G1 47 18
"DB 25 G" G1 1/4 58 20
"DB 30 G" G1 1/2 65 22

Subplate mounting "no code"

Dimensions in mm

1

Name plate

2

X port for pilot oil supply, external

3

Y port for pilot oil return, external

4

Adjustment type "1"

5

Adjustment type "2"

6

Adjustment type "3"

7

Adjustment type "7"

8

Hexagon SW10

9

Space required to remove the key

10

Locking pin

11

Valve mounting bores

19

Omitted with internal pilot oil return

35

Lock nut SW17, tightening torque MA = 10+5 Nm

Version

L1

L2

L3

L4

L5

L6

L7

L8

L9

B1

B2

ØD1

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

"DB 10" 91 53.8 22.1 27.5 22.1 47.5 0 25.5 2 78 53.8 14
"DB 20" 116 66.7 33.4 33.3 11.1 55.6 23.8 22.8 10.5 100 70 18
"DB 30" 147.5 88.9 44.5 41 12.7 76.2 31.8 20 21 115 82.6 20

Pilot control valve with ("DBC 10 or 30") or without main spool insert ("DBC, DBT")

Dimensions in mm

Installation bore

Dimensions in mm

1

Name plate

3

Y port for pilot oil return, external

5

Adjustment type "2"

6

Adjustment type "3"

7

Adjustment type "7"

8

Hexagon SW10

9

Space required to remove the key

11

Valve mounting bores

20

Seal ring

21

Main spool insert

22

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

23

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

24

Nozzle (separate order; recommended nozzle Ø1.0 mm)

25

Seal ring

26

Seal ring

27

Seal ring

28

Support ring

29

Support ring

35

Lock nut SW17, tightening torque MA = 10+5 Nm

Valve mounting screws (separate order)

For reasons of stability, exclusively the following valve mounting screws may be used:

Version "DB 10"
4 x ISO 4762 - M12 x 50 - 10.9-flZn/nc/480h/C
with friction coefficient μtotal = 0.09 … 0.14
tightening torque MA  = 75 Nm ±10%
material no. R913015611 Version "DB 20"
4 x ISO 4762 - M16 x 50 - 10.9-flZn/nc/480h/C
with friction coefficient μtotal = 0.09 … 0.14
tightening torque MA = 185 Nm ±10%
material no. R913015664 Version "DB 30"
4 x DIN 912 - M18 x 50 - 10.9-flZn/nc/480h/C
with friction coefficient μtotal = 0.09 … 0.14
tightening torque MA = 248 Nm ±10%
material no. R913015903 Version "DBC", "DBC 10", "DBC 30" and "DBT"
4 x ISO 4762 - M8 x 40 - 10.9-flZn/nc/480h/C
with friction coefficient μtotal = 0.09 … 0.14
tightening torque MA = 31 Nm ±10%
material no. R913015798

 

Notice:

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

Required surface quality of the valve contact surface

Safety instructions: Type-examination tested safety valves type DB…E

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

Before ordering a type-examination tested safety valve, it must be observed that for the desired response overpressure p, the maximum admissible flow qV max of the safety valve must be larger than the maximum possible flow of the system. According to Pressure Equipment Directive 2014/68/EU , the increase of the system pressure by the flow must not be higher than 10 % of the set response pressure (see component marking). Discharge lines (ports T and Y) of safety valves must end in a risk-free manner. The accumulation of fluids in the discharge lines must not be possible (AD 2000 data sheet A 2). If a lead seal at the safety valve is removed, the approval according to the PED! Basically, the requirements of the Pressure Equipment Directive 2014/68/EU and of data sheet AD 2000 A 2 have to be observed.

 

It is imperative to observe the application notes!

In the plant, the response pressure specified in the component marking is set at a flow of 2 l/min.

The maximum admissible flow stated in the component marking (= numerical value instead of the character "G" in the component marking, see ordering code, type-examination tested safety valves) must not be exceeded.

It applies to:

Pilot oil return “external” (= Y in the ordering key) without counter pressure in the discharge line Y, admissible counter pressure in the discharge line (port T) < 15 bar Pilot oil return “internal” (= no code in the ordering key). The maximum admissible flow is only admissible without counter pressure in the discharge line (port T).

With internal pilot oil return, the system pressure increases by the counter pressure in the discharge line (port T) with increasing flow (observe AD2000 - data sheet A2 - item 6.3!).

To ensure that this increase in system pressure caused by the flow does not exceed the value of 10% of the set response pressure, the admissible flow has to be reduced dependent on the counter pressure in the discharge line (port T) (see diagrams (Safety instructions, Type-examination tested safety valves)).

 

 

It is imperative to observe the application notes!

In the plant, the response pressure specified in the component marking is set with a flow of 11 l/min. The maximum admissible flow stated in the component marking (= numerical value instead of the character "G" in the component marking, see ordering code, type-examination tested safety valves) must not be exceeded.
It applies to: Pilot oil return external ("Y") without counter pressure in the discharge line Y; admissible counter pressure in the discharge line (port T) < 15 bar Pilot oil return internal ("no code"). The maximum flow is only admissible without counter pressure in the discharge line (port T).

 

With internal pilot oil return, the system pressure increases by the counter pressure in the discharge line (port T) due to the increasing flow (observe AD2000 - data sheet; A2, item 6.3!)

To ensure that this increase in system pressure caused by the flow does not exceed 10% of the set response pressure, the admissible flow has to be reduced dependent on the counter pressure in the discharge line (port T) (see diagrams (Safety instructions, Type-examination tested safety valves)).

 

Notice:

Possible unloading via the directional valve must not be applied for safety-relevant functions! If unloading is required for safety-relevant functions, an additional unloading valve must be installed.

 

General information

The unloading function (directional valve function with version "DBW") must not be used for safety functions! With version "B", the lowest adjustable pressure (circulation pressure) is set in case of power failure or cable break. With version "A", the pressure limiting function is set in case of power failure or cable break. Hydraulic counter pressures in port T with internal pilot oil return and/or port Y with external pilot oil return add 1:1 to the response pressure of the valve set at the pilot control.
Example: Pressure adjustment of the valve by spring preload (item 9 "Product description") in the pilot control valve/adjustment type pspring = 200 bar Hydraulic counter pressure in port T with internal pilot oil return phydraulic = 50 bar => Response pressure = pspring + phydraulic = 250 bar
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