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Артикул: RX7495

Все товары Bosch Rexroth

Pressure relief valve, direct controlled DBD

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Description

  • Size 6 … 30
  • Component series 1X
  • Maximum operating pressure 630 bar
  • Maximum flow 350 l/min

Features

  • 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

Product description

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.

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.

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)

Symbol

Type code

01

02

03

04

05

06

07

08

09

10

11

DBD

1X

/

*

01

Pressure relief valve, direct controlled

DBD

Adjustment type for pressure adjustment

02

NG6

NG8

NG10

NG15

NG20

NG25

NG30

Sleeve with hexagon and protective cap

S

Rotary knob

1)

H

Hand wheel

2)

H

Lockable rotary knob

1; ,3; 4)

A

03

Size 6 (connection G1/4)

6

Size 8 (connection G3/8)

8

Size 10 (connection G1/2)

10

Size 15 (connection G3/4)

15

Size 20 (connection G1)

20

Size 25 (connection G1 1/4)

25

Size 30 (connection G1 1/2)

30

Type of connection

04

NG6

NG8

NG10

NG15

NG20

NG25

NG30

As screw-in cartridge valve (cartridge)

K

For threaded connection

G

For subplate mounting

P

05

Component series 10 ... 1Z (10 ... 1Z: unchanged installation and connection dimensions)

1X

Pressure rating

5)

06

NG6

NG8

NG10

NG15

NG20

NG25

NG30

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 400 bar

400

Set pressure up to 630 bar

6)

630

Corrosion resistance

(For availability see table below)

07

None

no code

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

J3

High corrosion protection (720 h salt spray test according to EN ISO 9227)

J5

Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")

08

NBR seals

no code

FKM seals

V

Line connection

09

Pipe thread according to ISO 228-1

no code

SAE thread

12

Equipment Directive

10

Without type-examination procedure

no code

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

E

11

Further details in the plain text

1)For size 20, only available for the pressure ratings "25", "50" or "100".
2)Pressure ratings "25", "50" or "100" only.
3)Key with material no. R900008158 is included in the scope of delivery.
4)Not for type-examination tested safety valves.
5)When selecting the pressure rating, please observe the characteristic curves.
6)With version "G" and "P", only available as "SO292", see "dimensions".

Availability corrosion resistance (Without type-examination procedure; only adjustment type "S")

Type of connection

NG6

NG8

NG10

NG15

NG20

NG25

NG30

As cartridge valve ("K")

no code, J5

no code, J5

no code, J5

no code, J5

For threaded connection ("G")

no code, J3

no code

no code, J3

no code

no code, J3

no code

no code, J3

For subplate mounting ("P")

no code, J3

no code, J3

no code, J3

no code, J3

Type-examination tested safety valves type DBD

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

Size

Type designation

Component marking

6

TÜV.SV.▢–849.5.F.αw.p.

TÜV.SV.▢–849.5.F.G.p.

10

TÜV.SV.▢–850.6.F.αw.p.

TÜV.SV.▢–850.6.F.G.p.

TÜV.SV.▢–390.4,5.F.30.p. 1)

20

TÜV.SV.▢–361.10.F.αw.p.

30

TÜV.SV.▢–362.15.F.αw.p.

▢ Information is entered at the factory

1)Component marking for DBD. 10.1X/...; 400 bar < p ≤ 630 bar

Adjustment type for pressure adjustment

01

NG6

NG10

NG20

NG30

Sleeve with hexagon and protective cap

S

Rotary knob

H

Hand wheel

H

Type of connection

02

NG6

NG10

NG20

NG30

As screw-in cartridge valve (cartridge)

K

For threaded connection

G

For subplate mounting

P

Pressure rating

1)

03

In the type designation, the pressure is to be entered by the customer.

Pressure adjustments ≥ 30 bar and in 5 bar steps possible.

Corrosion resistance

(For availability see table below)

04

None

no code

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

J3

High corrosion protection (720 h salt spray test according to EN ISO 9227)

J5

Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")

05

NBR seals

no code

FKM seals

V

Line connection

06

Pipe thread according to ISO 228-1

no code

1)When selecting the pressure rating, please observe the characteristic curves.

Availability corrosion resistance (With type-examination procedure)

Type of connection

NG6

NG10

NG20

NG30

As cartridge valve ("K")

no code, J5

no code, J5

no code, J5

no code, J5

For threaded connection ("G")

no code, J3

no code, J3

no code, J3

no code, J3

Technical data

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

general

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).

MTTFD values according to EN ISO 13849 1)

yrs

​150 … ​1200
1)For further details, see data sheet 08012

hydraulic

Size

681015202530

Maximum operating pressure

Inlet

Standard

bar

400315

Version "630"

bar

-630-

Outlet

bar

315

Minimum set pressure

see "characteristic curves"

Maximum flow (standard valves)

see "characteristic curves"

Hydraulic fluid

see table "Hydraulic fluid"

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, cleanliness class according to ISO 4406 (c) 1)

Class 20/18/15
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.

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) pspring = 200 bar
  • Hydraulic counter pressure in port T: phydraulic = 50 bar
  • ⇒ Response pressure = pspring + phydraulic = 250 bar

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

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)

FKM

HFDR

FKM

Containing water

HFC (Fuchs: Hydrotherm 46M, Renosafe 500;
Petrofer: Ultra Safe 620;
Houghton: Safe 620;
Union: Carbide HP5046)

NBR

ISO 12922

90223

  • For more information and data on the use of other hydraulicfluids, 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 – containing water: If components with galvanic zinc coating (e.g. version "J3" or "J5") or parts containing zinc are used, small amounts of dissolved zinc may get into the hydraulic system and cause accelerated aging of the hydraulic fluid. Zinc soap may form as a chemical reaction product, which may clog filters, nozzles and solenoid valves - particularly in connection with local heat input.
  • Flame-resistant – containing water:
    • Due to increased cavitation tendency with HFC hydraulic fluids, the life cycle of the component may be reduced by up to 30% as compared to the use with mineral oil HLP. In order to reduce the cavitation effect, it is recommended - if possible specific to the installation - to back up the return flow pressure in ports T to approx. 20% of the pressure differential at the component.

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

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

general

Ambient temperature range

°C

-10 … +80

Conformity

CE according to Pressure Equipment Directive 2014/68/EU

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 (= "TS")

°C

-10 … +60

Viscosity range

mm²/s

12 … 230

Diagrams/characteristic curves

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

Minimum set pressure

Size 6

Minimum set pressure

Size 8 and 10

Minimum set pressure

Size 15 and 20

Minimum set pressure

Size 25 and 30

Δp-qV characteristic curves

Size 6

Δp-qV characteristic curves

Size 8 and 10

Δp-qV characteristic curves

Size 15 and 20

Δp-qV characteristic curves

Size 25 and 30

Notices:

  • The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.
  • The characteristic curves only apply with the specified environmental and temperature conditions. It has to be noted that the development of the characteristic curve will be influenced in case of deviating boundary conditions.
  • The characteristic curves refer to the specified pressure ratings (e.g. 200 bar). The more the set pressure value differs from the nominal pressure rating (e.g. < 200 bar), the larger the pressure increase with increasing flow gets.

Type-examination tested safety valves type DBD

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

Size 6

Size 10

Size 20

Size 30

Notice:

Value pairs located in the areas of the characteristic curves with gray background can not be realized with the safety valve. The characteristic curves shown here are only valid for a counter pressure of 0 bar in the discharge line.

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 = 115 l/min
  • Safety valve set to: pA = 315 bar.
  • Read off the maximum counter pressure pT of approx. 22,5 bar from the diagram (see arrows, Size 6, characteristic curve 7).

Example 2 (with interpolated characteristic curve):

  • Flow of the system / accumulator to be secured: qVmax = 15 l/min
  • Safety valve set to: pA = 80 bar.
  • Value to be marked at the axis referred to as pT: 1/10 x 80 bar = 8 bar.
  • Read off the maximum counter pressure pT of approx. 3 bar from the diagram (see arrows, dashed characteristic curve).

Size 6

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 DBD... 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".

Characteristic curves

Response pressurepA in bar

1

30

2

60

3

110

4

115

5

170

6

210

7

315

8

400

pA

Response pressure in bar

pT

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

qVmax

Maximum flow in l/min

▢ |

Interpolation area |, for valves with response pressure pA = 30 ... 110 bar and maximum flow qVmax = 14 ... 27 l/min

▢ ‖

Interpolation area , for valves with response pressure pA = 115 ... 400 bar and maximum flow qVmax = 52 l/min

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 DBD... 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".

Characteristic curves

Response pressurepA in bar

1

30

2

60

3

110

4

170

5

175

6

210

7

315

8

400

9

405

10

630

pA

Response pressure in bar

pT

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

qVmax

Maximum flow in l/min

▢ ▢

Interpolation areas

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 DBD... 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

qVmax

Maximum flow in l/min

Characteristic curves

Response pressurepA in bar

1

30

2

60

3

110

4

170

5

210

6

315

7

320

8

400

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 DBD... 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

qVmax

Maximum flow in l/min

Characteristic curves

Response pressurepA in bar

1

30

2

60

3

110

4

170

5

210

6

315

Dimensions

Threaded connection

Dimensions in mm

1

Adjustment type "S" (example)
Grub screw with hexagon and protective cap

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 below.

5

Arrangement of the tapped holes with version "12"

NG

B1

B2

ØD1

D2

ØD3

D4

H1

H2

L1

L2

L3

L4

L5

L6

T1

T2

Weight (approx.)

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

kg

6456025M66.6G1/425408041555402010121.5
8608028M89G3/8406010042070482115123.7
10608034M89G1/2406010042070482115143.7
157010042M89G3/45070135420100653418166.4
207010047M89G150701355.520100653418186.4
2510013056M1011G1 1/460901805.5251308535202013.9
3010013065M1011G1 1/260901805.5251308535202213.9

Deviating dimensions for version "12"

NG

ØD1

D2

D4

T2

mm

mm

6211/4"-20 UNC7/16"-20 UNF12
8255/16"-18 UNC9/16"-18 UNF13
10325/16"-18 UNC3/4"-16 UNF15
15415/16"-18 UNC1 1/16"-12 UN20
20495/16"-18 UNC1 5/16"-12 UN20
25583/8"-16 UNC1 5/8"-12 UN20
30703/8"-16 UNC1 7/8"-12 UN16

Fittings

NG

Tightening torque MA in Nm

1)​

Plug screw (4)

Pipe fittings

6

30

60

8

40

90

10

60

130

15

80

200

20

135

380

25

480

500

30

560

600

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

Cartridge valve

Dimensions in mm

1.1

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

1.2

Adjustment type "S” – Grub screw with hexagon and protective cap; external hexagon (NG30)

1.3

Adjustment type "S” – Grub screw with hexagon and protective cap; version "J3" and "J5"

2.1

Adjustment type “H” – rotary knob (NG6 … NG20)

2.2

Adjustment type “H” – hand wheel (NG30)

3

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

4

Type designation

5

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).

6

Lock nut, tightening torque MA = 10+5 Nm

7

Space required to remove the key

NG

ØD11

ØD12

ØD13

L17

L18

L19

L20

L21

L22

L23

L24

L25

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

mm

kg

63460-7211832820--64.582.532196-30190.4
103860-6811792820--7778.536196-30190.5
204860-6511772820--1067546196-30191
3063-8083----115613194.36019-13-192.2

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.

Installation bore

Dimensions in mm

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

1

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

2

Port T, at any place at the circumference

3

Depth of fit

4

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

NG

D14

ØD15

ØD16

ØD17

ØD18

ØD19

L26

L27

L28

L29

L30

L31

L32

α1

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

°

6M28 x 1.525H961524.9+ 0.152
- 0.2
12151930364556.5± 5.56515
10M35 x 1.532H91018.531.9+ 0.162
- 0.2
1518233541.55267.5± 7.58015
20M45 x 1.540H9202439.9+ 0.162
- 0.2
22212745557091.5± 8.511020
30M60 x 255H93038.7554.9+ 0.174
- 0.2
342329456384113.5± 11.514020

Subplate mounting

Dimensions in mm

Required surface quality of the valve contact surface

1

Adjustment type "S" (example)
Grub screw with hexagon and protective cap

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”). (Tightening torques see dimensional table)

5

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

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

645606.6408041555402015G1/41.5
10608096010042070452115G1/23.7
20701009701355.520100653415G3/46.4
3010013011901805.525130853515G1 1/413.9

Deviating dimensions for version "12"

NG

Port P

67/16"-20 UNF
103/4"-16 UNF
201 5/16"-12 UN
301 7/8"-12 UN

Valve mounting screws (separate order)

Size

Quantity

Hexagon socket head cap screws

Material number

6

4

ISO 4762 - M6 x 50 - 10.9-CM-Fe-ZnNi-5-Cn-T0-H-B

(Friction coefficient μtotal = 0.09 … 0.14)

Tightening torque MA = 12.5 Nm ±10 %

R913048088

10

4

ISO 4762 - M8 x 70 - 10.9-FlZn/nc/480h/C

Tightening torque MA = 28 Nm ± 10 %

R913043410

20

4

ISO 4762 - M8 x 90 - 12.9-flZn/nc/480h/C

Tightening torque MA = 28 Nm ± 10 %

R913069227

30

4

ISO 4762 - M10 x 110 - 12.9-flZn/nc/480h/C

Tightening torque MA = 56 Nm ±10 %

R913059433

Notices:

  • For reasons of stability, exclusively the specified valve mounting screws shall be used.
  • As replacement, you can use screws specified according to DIN 912.

Deviating dimensions : Screw-in cartridge valve as type-examination tested safety valve type DBD

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

Dimensions in mm

1.3

Adjustment type "S" – hexagon with safety cap

2.1

Adjustment type “H”, hand wheel

2.2

Adjustment type “H” – rotary knob

7

Lock nut, tightening torque MA = 10+5 Nm

ØD11

ØD12

ØD13

L18

L19

L22

L23

L24

L25

SW1

SW2

Weight (approx.)

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

kg

3460401183116364.58032190.4
3860401197115978.576.536190.5
4860401177115710772.546191
63-80--11871349360192.2

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.

Adjustment type for corrosion resistance

NG6

NG10

NG20

NG30

Without corrosion protection

2.1

2.1

2.1

2.2

Version "J3" and "J5"

2.2

2.2

2.2

2.2

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

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

Dimensions in mm

NG

B1

B2

H1

H2

ØD1H13

ØD2H13

R1

mm

mm

mm

mm

mm

mm

mm

64512.52522.57408
106020.54020.59448
20702450249558
3010029.56029.511738

Notice:

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

Safety Instructions

Type-examination tested safety valves, version "E"

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

The functionality of these valves corresponds to that of the standard series (see "Product description"). Valves of type DBD…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 and/or secured using a safety cap which cannot be disassembled in non-destructive manner.

The safety valves are available with graded response pressures (in 5 bar steps). The valve version provided with a safety cap can no longer be adjusted. With valve versions equipped with rotary knob or hand wheel, the valve spring can be unloaded by the user. This way, a response pressure lower than the factory setting can be set without the need of removing the lead seal.

  • Before ordering a type-examination tested safety valve, it must be observed that for the desired response pressure p, the maximum admissible flowqVmax of the safety valve must be larger than the maximum possible flow of the system/accumulator to be secured. According to the Pressure Equipment Directive 2014/68/EU, the increase in the system pressure due to the flow must not exceed 10 % of the set response pressure (see component marking - ordering code, type-examination tested safety valves).
  • The maximum admissible flow qVmax stated in the component marking must not be exceeded.
  • Discharge lines of safety valves must end in a risk-free manner. The accumulation of fluids in the discharge system must not be possible (see data sheet AD2000 A2).

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 flow stated in the component marking applies for applications without counter pressure in the discharge line (port T).
  • By removing the lead seal at the safety valve, the approval according to the Pressure Equipment Directive becomes void!
  • Basically, the requirements of the Pressure Equipment Directive and of data sheet AD2000 A2 have to be observed!
  • It is recommended to secure type-examination tested safety valves against inadmissible disassembly by means of wiring and sealing with the housing/block (bore available in the adjustment type).

Notice:

The system pressure increases by the counter pressure in the discharge line (port T) due to the increasing 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 - Safety instructions, Type-examination tested safety valves).

Downloads

Pressure relief valve, direct operated
Data Sheet | RE25402 | 2021-08-01 | English, United States | PDF | 1.1MB

Product Groups: Pressure relief valves
Type DBD
Pressure relief valve, direct operated
Manual | RE25402-B | 2021-10-01 | English | PDF | 1.9MB

Product Groups: Industrial Hydraulics
Type DBD...1X/..E

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