Pressure relief valve, direct controlled DBD

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Артикул: RX7495

Pressure relief valve, direct controlled DBD

Name: Pressure relief valve, direct controlled DBD
Brand: Bosch Rexroth
SKU: RX7495
Price: 2850 RUB
Availability: InStock

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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
08	FKM seals								V
Line connection
09	Pipe thread according to ISO 228-1								no code
09	SAE thread								12
Equipment Directive
10	Without type-examination procedure								no code
10	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.
6		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
05	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
Ambient temperature range	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				6	8	10	15	20	25	30
Maximum operating pressure	Inlet	Standard	bar	400					315
	Inlet	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
Hydraulic fluid temperature range	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
	Insoluble in water	HEES	FKM	ISO 15380
	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

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

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

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.)
NG	mm	mm	mm		mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg
6	45	60	25	M6	6.6	G1/4	25	40	80	4	15	55	40	20	10	12	1.5
8	60	80	28	M8	9	G3/8	40	60	100	4	20	70	48	21	15	12	3.7
10	60	80	34	M8	9	G1/2	40	60	100	4	20	70	48	21	15	14	3.7
15	70	100	42	M8	9	G3/4	50	70	135	4	20	100	65	34	18	16	6.4
20	70	100	47	M8	9	G1	50	70	135	5.5	20	100	65	34	18	18	6.4
25	100	130	56	M10	11	G1 1/4	60	90	180	5.5	25	130	85	35	20	20	13.9
30	100	130	65	M10	11	G1 1/2	60	90	180	5.5	25	130	85	35	20	22	13.9

Deviating dimensions for version "12"

NG	ØD1	D2	D4	T2
NG	mm			mm
6	21	1/4"-20 UNC	7/16"-20 UNF	12
8	25	5/16"-18 UNC	9/16"-18 UNF	13
10	32	5/16"-18 UNC	3/4"-16 UNF	15
15	41	5/16"-18 UNC	1 1/16"-12 UN	20
20	49	5/16"-18 UNC	1 5/16"-12 UN	20
25	58	3/8"-16 UNC	1 5/8"-12 UN	20
30	70	3/8"-16 UNC	1 7/8"-12 UN	16

Fittings

NG	Tightening torque MA in Nm 1)
NG	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.)
NG	mm	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	82.5	32	19	6	-	30	19	0.4
10	38	60	-	68	11	79	28	20	-	-	77	78.5	36	19	6	-	30	19	0.5
20	48	60	-	65	11	77	28	20	-	-	106	75	46	19	6	-	30	19	1
30	63	-	80	83	-	-	-	-	11	56	131	94.3	60	19	-	13	-	19	2.2

Tightening torques MA in Nm for screw-in cartridge valves

NG	Pressure rating in bar
NG	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
NG		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	+ 0.152 - 0.2	12	15	19	30	36	45	56.5	± 5.5	65	15
10	M35 x 1.5	32	H9	10	18.5	31.9	+ 0.162 - 0.2	15	18	23	35	41.5	52	67.5	± 7.5	80	15
20	M45 x 1.5	40	H9	20	24	39.9	+ 0.162 - 0.2	22	21	27	45	55	70	91.5	± 8.5	110	20
30	M60 x 2	55	H9	30	38.75	54.9	+ 0.174 - 0.2	34	23	29	45	63	84	113.5	± 11.5	140	20

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.)
NG	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 for version "12"

NG	Port P
NG
6	7/16"-20 UNF
10	3/4"-16 UNF
20	1 5/16"-12 UN
30	1 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
34	60	40	11	83	11	63	64.5	80	32	19	0.4
38	60	40	11	97	11	59	78.5	76.5	36	19	0.5
48	60	40	11	77	11	57	107	72.5	46	19	1
63	-	80	-	-	11	87	134	93	60	19	2.2

Tightening torques MA in Nm for screw-in cartridge valves

NG	Pressure rating in bar
NG	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
NG	mm	mm	mm	mm	mm	mm	mm
6	45	12.5	25	22.5	7	40	8
10	60	20.5	40	20.5	9	44	8
20	70	24	50	24	9	55	8
30	100	29.5	60	29.5	11	73	8

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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