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DBD 

| Pressure relief valve

Bosch Rexroth AG

, RE 25710, edition: 2016-07

Designation

 Component marking

Maximum flow 

q

V max

  

in l/min

Set  

response overpressure 

p

 

in bar

DBDS 4 K1X/ 

 E 

DBDH 4 K1X/ 

 E 

TÜV.SV.-   -1038.4.F.G.p

10

60 … 315

17

320 … 500

Ordering code: 

Type-examination tested safety valves type DBD

 1)

 

Type-examination tested safety valves

The functionality of these valves corresponds to that of the 
standard series (see page 3). Valves of type 
DBD..1X/..E are, however, type-examination tested 
pressure relief valves according to the Pressure Equipment 
Directive 2014/68/EU and intended for use as safety 
valves.
At the factory, the response pressure is set to a fixed 
maximum value using the adjustment type. Afterwards, the 
safety valve is sealed.

The safety valves are available with graded response 
pressures (in 5 bar steps). With valve versions equipped 
with rotary knob or hand wheel, the valve spring can be 
unloaded by the user and a  response pressure lower than 
the factory setting can be set without the need of 
removing the lead seal.

  Pressure in the type designation is to be entered by the 

customer, pressure adjustment 

≥ 

60 bar and possible in 5-bar 

steps.

  Information is entered at the factory

1)

  Component series 1X according to the Pressure Equipment 

Directive 2014/68/EU

1)

  Component series 1X, according to Pressure Equipment Directive 

2014/68/EU (For applications outside these parameters, please 
consult us!)

hydraulic

Set response pressure

bar  See last figure of the component marking above

Maximum counter pressure in the discharge line

bar  See characteristic curves on page 9 and 10

Maximum flow

l/min  The last but one figure of the component marking attached at 

the safety valve is always binding, see above. For valve types 
which have a variable maximum flow depending on the response 
pressure, the discharge coefficient is specified at this place (see 
also page 10)

Hydraulic fluid

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

Hydraulic fluid temperature range

°C  –10 … +60

Viscosity range

mm

2

/s  12 … 230

Deviating technical data: 

Type-examination tested safety valves type DBD 

1)

 

general

Ambient temperature range

°C  –10 … +60

Содержание REXROTH DBD

Страница 1: ... Technical data 4 Characteristic curves 5 General information 5 Dimensions 6 Mounting cavity 7 Type examination tested safety valves type DBD K according to Pressure Equipment Directive 2014 68 EU in the following shortly PED Ordering code 8 Deviating technical data 8 Safety instructions 9 Characteristic curves 9 10 Further information 11 Size 4 Component series 1X Maximum operating pressure 500 b...

Страница 2: ... 10 19 10 19 unchanged installation and connection dimensions 1X Pressure rating 06 Set pressure up to 25 bar 25 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 Set pressure up to 420 bar 420 Set pressure up to 500 bar 500 Seal material 07 FKM seals V Observe compatibility of seals with hydraul...

Страница 3: ...limiting a system pressure The system pressure can be set via the adjustment type 5 In the initial position the valve is closed Via control line 1 and poppet 2 the pressure in the main port acts on the spring plate 3 If the pressure in the main port rises above the value set at the compression spring 4 the poppet 2 opens and the hydraulic fluid flows into the main port Type DBDS 4 K1X V 1 Main por...

Страница 4: ...ystems 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 NBR FKM DIN 51524 90220 Bio degradable Insoluble in water HETG FKM ISO 15380 90221 HEES FKM Soluble in water HEPG FKM ISO 15380 Im...

Страница 5: ... characteristic curves apply to output pressure zero in the entire volume flow range and were measured without housing resistance Hydraulic counter pressures in the main port T add 1 1 to the response pressure of the valve set at the adjustment Example Pressure adjustment of the valve due to spring preload item 4 on page 3 pspring 200 bar Hydraulic counter pressure in the main port T phydraulic 50...

Страница 6: ...6 07 1 1 Adjustment type S internal hexagon SW5 1 2 Adjustment type H hand wheel 2 Lock nut SW17 tightening torque MA 10 5 Nm 3 Hexagon SW17 tightening torque when screwing in MA 23 2 Nm 4 Embossed type designation Main port 1 P Main port 2 T Dimensions dimensions in mm ...

Страница 7: ...ity R DBD 4K 2 main ports thread M14 x 1 dimensions in mm 1 Depth for moving parts 2 All seal ring insertion faces are rounded and free of burrs 3 With countersink 4 Visual inspection Main port 1 P Main port 2 T can optionally be arranged at the circumference Tolerance for all angles 0 5 ...

Страница 8: ...thout the need of removing the lead seal Pressure in the type designation is to be entered by the customer pressure adjustment 60 bar and possible in 5 bar steps Information is entered at the factory 1 Component series 1X according to the Pressure Equipment Directive 2014 68 EU 1 Component series 1X according to Pressure Equipment Directive 2014 68 EU For applications outside these parameters plea...

Страница 9: ...asing flow Observe the data sheet AD 2000 A 2 point 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 on page 9 and 10 1 Component series 1X according to the Pressure Equipment Directive 2014 68 EU Charac...

Страница 10: ...es pA pA Response pressure in bar pT Maximum counter pressure in the discharge line port T in bar qVmax Maximum flow in l min Determination of the maximum counter pressure Example with already existing characteristic curve Flow of the system accumulator to be secured qVmax 5 l min Safety valve set to pA 500 bar Read off the maximum counter pressure pT of approx 36 bar from the diagram see arrows c...

Страница 11: ... sheet 90220 Environmentally compatible hydraulic fluids Data sheet 90221 Flame resistant water free hydraulic fluids Data sheet 90222 Flame resistant hydraulic fluids containing water HFAE HFAS HFB HFC Data sheet 90223 Reliability characteristics according to EN ISO 13849 Data sheet 08012 Hydraulic valves for industrial applications Operating instructions 07600 B Selection of the filters www bosc...

Страница 12: ... in it are the exclusive property of Bosch Rexroth AG It may not be reproduced or given to third parties without its consent The data specified above only serve to describe the product No statements concerning a certain condition or suitability for a certain application can be derived from our information The information given does not release the user from the obligation of own judgment and verif...

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