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BOSCH REXROTH
DBDS6G1X/200/12
R900341066
Pressure Relief Valves

Pressure valves: DBD* 6 G,P1x/

$345.00

BOSCH REXROTH

MATERIAL:  R900341066

SUMMARY:  Pressure valves: DBD* 6 G,P1x/

Quantity in stock: 9

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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)

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Type DBDH 10 K1X/…

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

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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

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

5)

G

For subplate mounting

P

05

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

1X

Pressure rating

6)

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

7)

630

Seal material

07

NBR seals

no code

FKM seals

V

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

Line connection

08

Pipe thread according to ISO 228/1

no code

SAE thread

12

Equipment Directive

09

Without type-examination procedure

no code

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

E

10

Further details in the plain text

1) With size 20, only available for the pressure ratings "25", "50" or "100".
2) Only available for the pressure ratings "25", "50" or "100".
3) Key with material no. R900008158 is included in the scope of delivery.
4) Not available for type-examination tested safety valves.
5) Not available for type-examination tested safety valves of size 8, 15 and 25.
6) When selecting the pressure rating, please observe the characteristic curves.
7) With version "G" and "P", only available as "SO292", see "dimensions".

Type-examination tested safety valves type DBD

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

NG

Type designation

Component marking

6

DBDS 6 K1X /▢ E

TÜV.SV. "xxx" –849.5.F.αw.p

TÜV.SV. "xxx" –849.5.F.G.p

DBDH 6 K1X /▢ E

DBDS 6 G1X /▢ E

DBDH 6 G1X /▢ E

DBDS 6 P1X /▢ E

DBDH 6 P1X /▢ E

10

DBDS 10 K1X /▢ E

TÜV.SV. "xxx" –850.6.F.αw.p.

TÜV.SV. "xxx" –850.6.F.G.p.

TÜV.SV. "xxx" –390.4,5.F.30.p. 1)

DBDH 10 K1X /▢ E

DBDS 10 G1X /▢ E

DBDH 10 G1X /▢ E

DBDS 10 P1X /▢ E

DBDH 10 P1X /▢ E

20

DBDS 20 K1X /▢ E

TÜV.SV. "xxx" –361.10.F.αw.p.

DBDH 20 K1X /▢ E

DBDS 20 G1X /▢ E

DBDH 20 G1X /▢ E

DBDS 20 P1X /▢ E

DBDH 20 P1X /▢ E

30

DBDS 30 K1X /▢ E

TÜV.SV. "xxx" –362.15.F.αw.p.

DBDH 30 K1X /▢ E

DBDS 30 G1X /▢ E

DBDH 30 G1X /▢ E

DBDS 30 P1X /▢ E

DBDH 30 P1X /▢ E

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

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

Pressure adjustment ≥ [si]30 bar [/si][imp]435 psi[/imp] and possible in 5 bar [/si][imp]75 psi[/imp] steps.

"xxx"

Value entered at the factory

For applications outside these parameters, please consult us!

general

Size

6 8 10 15 20 25 30

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

6 8 10 15 20 25 30

Maximum operating pressure

Inlet

bar

400 630 400 315

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) pspring = 200 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

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

Size 6

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Size 8 and 10

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Size 15 and 20

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Size 25 and 30

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Notices:

The characteristic curves apply to the pressure at the valve output p = 0 bar across 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 Pressure Equipment Directive 2014/68/EU) (dimensions in mm)

Size 6

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Size 10

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Size 20

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Size 30

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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".

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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".

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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".

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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".

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Threaded connection "G"

(dimensions in mm)

Dimensions in mm

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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 MA in 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

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Cartridge valve

Dimensions in mm

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

Dimensions in mm

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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)

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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

technical illustration-DBDS6G1X/200/12-Pressure valves: DBD*  6 G,P1x/

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 %.

Type-examination tested safety valves type DBD

(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..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 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 and a response pressure lower than the factory setting can be set without the need of removing the lead seal.

Safety instructions

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).