PUMP SAFETY BLOCK DBA40H2N1X/350

Manufacturer: Bosch Rexroth

Material #: R900956020

Model : DBA40H2N1X/350

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth DBA40H2N1X/350 (R900956020) is a high-performance, mechanically actuated industrial hydraulic valve designed for reliable pressure relief up to its set value. It features a pilot-operated spool symbol P T, with a maximum pressure capacity that ensures it can handle demanding applications. This product is part of the DBA series of pump safety blocks and comes equipped with an integrated pilot control valve for precise pressure adjustments. This valve's size and flange connection type make it suitable for direct mounting onto the SAE pressure port of pumps, streamlining the installation process. Its design includes a main spool insert that allows hydraulic fluid to flow from port P to port T when open, maintaining the set operating pressure while preventing system overloads. The DBA40H2N1X/350 is versatile in its applications, offering various adjustment types for pressure settings, including a rotary knob, sleeve with hexagon and protective cap, lockable rotary knob with scale, and rotary knob with scale. It has multiple pressure ratings available to suit different system requirements. Additionally, this model offers optional features such as solenoid-actuated unloading via a built-on directional valve and an integrated check valve that maintains system pressure when the pump is disconnected. With its zero-pressure startup capability and quick pressure buildup, this pump safety block is ideal for ensuring smooth operation and protection of hydraulic systems. The maximum flow rate specification further highlights its capacity to manage significant volumes of hydraulic fluid efficiently. Overall, the Bosch Rexroth DBA40H2N1X/350 provides robust performance in controlling operating pressures within hydraulic systems while offering flexibility in customization to meet specific application needs.

$2,183.00 USD

More are expected on April 22, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 22, 2025 when ordered in

This product is eligible for factory repair.

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PUMP SAFETY BLOCK DBA40H2N1X/350

Size 40, P → T, mechanically actuated

Industrial hydraulic valve in a high performance range. Reliable pressure relief to setting value.

Unpacked Weight: 11.740 kg

Zero-pressure start-up and circulation of the pump For direct mounting to the SAE pressure port of the pump Quick pressure build-up 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, optional Solenoid-actuated unloading via a built-on directional valve Integrated check valve, optional

Pump safety blocks of type DBA are pilot-operated pressure relief valves which are integrated into a block and intended to be mounted directly onto the SAE pressure port of pumps.

They are used for limiting the operating pressure. The pump safety blocks basically consist of a valve block (1), main spool insert (3) and pilot control valve (2) with adjustment type for pressure adjustment. The valve housing has a port P for the hydraulic fluid input and port P1 for the output. In a branch of the through-bore between these two ports there is the main spool insert. When this is open there is a connection to port T (tank line).

Pump safety block type DBA

The pressure applied in the through-bore 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 the through-bore exceeds the value set at spring (9), ball (8) opens against spring (9).

The signal for this is provided internally from the through-bore via control lines (10) and (6). 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 DBA …– via control line (13), or externally for type DBA …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. The hydraulic fluid now flows from channel P to channel T, whilst the set operating pressure is maintained.

Port (15) can be used for remote control purposes. If a pressure load cell or a pressure gauge shut-off valve is to be connected here, then version SO616 – without nozzle (4) – must be ordered. This prevents delays in the pressure build-up or brief pressure drops when the pressure gauge shut-off valve is operated.

Pump safety block type DBAR (with check valve)

The integrated check valve maintains the system pressure when the pump is disconnected and prevents the hydraulic fluid from returning to the pump. If this valve is selected, no separate check valve is needed.

Pilot-operated
Pilot-operated

Data Sheet	Download Data Sheet
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Spool symbol	P → T
Max. pressure	350
Productgroup ID	9,10,11,12,13,14
Number of ports	2
Type of actuation	with mechanical actuation
Size	40
Max. flow	650
Type of connection	Flange connection
Connection diagram	Flange SAE 1 1/2 according to ISO 6162-2
Number of switching positions	2
Weight	11.740
Seals	NBR
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HFC

01	02	03	04	05	06	07	08	09		10	11	12	13	14	15	16	17	18	19	20	21
DBA								1X	/												*

01	Pump safety block	DBA
02	Without directional valve	no code
03	Without check valve	no code
03	With check valve	R 1)
04	Size 32	30
04	Size 40	40
Connection / SAE flange 2)
Connection / SAE flange 2)
06	Standard flange (200 … 350 bar)	F
06	High-pressure flange (350 bar)	H
Adjustment type for pressure adjustment
07	Rotary knob	1
	Sleeve with hexagon and protective cap	2
	Lockable rotary knob with scale	3 3)
	Rotary knob with scale	7
08	With main spool Ø24 mm	–
08	With main spool Ø28 mm	N
09	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)	1X
Pressure rating
10	Set pressure … 50 bar	50
	Set pressure … 100 bar	100
	Set pressure … 200 bar	200
	Set pressure … 250 bar	250
	Set pressure … 315 bar	315
	Set pressure … 350 bar (only version “H”)	350
Pilot flow
11	Pilot oil supply and pilot oil return internal (standard)	– 4)
11	Internal pilot oil supply, external pilot oil return	Y
12	Standard version	no code
12	Valve for minimum cracking pressure (not suitable for mutual relief!)	U
13	Without switching shock damping	no code
14	Without directional valve	no code
16	Without manual override	no code
Electrical connection
17	Without mating connector, with connector DIN EN 175301-803	K4 5)
Seal material
19	NBR seals	no code
	FKM seals	V
	(other seals upon request) Attention! Observe compatibility of seals with hydraulic fluid used!
Type-examination procedure
20	Without type-examination procedure	no code
20	Type-examination tested safety valve according to PED 2014/68/EU	E
21	Further details in the plain text	*

	1) Only … 315 bar
	2) Please observe the pressure ratings and connection dimensions! (see dimensions).
	3) H-key with material no. R900008158 is included in the scope of delivery.
	4) Hyphen “–” only required if 12 and 13 = “no code”
	5) Mating connectors, separate order.

Preferred types and standard units are contained in the EPS (standard price list).

general

Size			32	40
Weight		kg	8	11.4
	Check valve "R"	kg	0.3	0.4
	Switching shock damping "S"	kg	0.6
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 fluid		Classification	Suitable sealing materials	Standards
Mineral oils and related hydrocarbons		HL, HLP, HLPD	NBR, FKM	DIN 51524
Bio-degradable	Insoluble in water	HETG	NBR, FKM	VDMA 24568
	Insoluble in water	HEES	FKM	VDMA 24568
	Soluble in water	HEPG	FKM	VDMA 24568
Containing water	Water-free	HFDU, HFDR	FKM	ISO 12922
Containing water	Containing water	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922
Important information on hydraulic fluids! For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us! There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)! Flame-resistant – containing water: Maximum operating pressure 210 bar Maximum hydraulic fluid temperature 60 °C Expected life cycle as compared to HLP hydraulic oil 30 % to 100 %

Technical data for directional seat valves see data sheet 22058, directional spool valves data sheet 23178.

Also see Deviating technical data for type-examination tested safety valves.

hydraulic

Maximum counter pressure	Port Y	bar	0
Maximum counter pressure	Port T	bar	10
Maximum flow			See ordering code, safety instructions and characteristic curves "Type-examination tested safety valve"
Hydraulic fluid			Mineral oil (HL, HLP) to DIN 51524
Hydraulic fluid temperature range	NBR seals	°C	-20 … +60
Hydraulic fluid temperature range	FKM seals	°C	-15 … +60
Viscosity range		mm²/s	12 … 230

hydraulic

Size			32	40
Maximum operating pressure	Port P	bar	350
	Port T	bar	315
Cracking pressure	(with DBAR...)	bar	0.5
Maximum counter pressure	Port Y	bar	315
Maximum set pressure		bar	50 100 200 315 350
Minimum set pressure			flow-dependent, see characteristic curves
Maximum flow	DBA, DBAR	l/min	600 350	650 450
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.

For applications outside these parameters, please consult us!

Deviating technical data: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/E C1)

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

Standard version

Minimum set pressure and circulation 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.

The characteristic curves apply to the pressure at the valve output pT = 0 baracross the entire flow range.

Version “U”

Minimum set pressure and circulation pressure dependent on the flow

Inlet pressure dependent on the flow

Maximum admissible flow qV max dependent on the counter pressure pT in the discharge line with internal pilot oil return

Type DBA 30 …-1X/…E

Characteristic curves for intermediate values can be generated by interpolation.

Further explanations see explanation of the diagrams

Type DBA 40 …-1X/…E

pA	Response pressure in bar
pT	maximum admissible counter pressure in bar) (sum of all possible counter pressures; also see AD2000 - data sheet A2)
	maximum admissible flow in l/min
	10 % x pA (with qV = 0) according to PED 97/23/EC

Explanation of the diagram
(Example: type DBA…E, above):
known:	Flow of the system/accumulator that has to be secured qVmax = 320 l/min
	Set response pressure of the safety valve pA = 350 bar
unknown:	pTadmissible
Solution:	see arrows in diagram above
	pT admissible (320 l/min; 350 bar) = 16.2 bar

Type DBA …–..

Type DBA …Y..

Type DBAR …–..

Type DBAR …Y..

With directional spool valve

Dimensions in mm

1	Name plate
2	Omitted with internal pilot oil return
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	Switching shock damping sandwich plate, optional
10	Space required to remove the key
11	Space required to remove the mating connector
12	Valve mounting bores
13.1	Directional spool valve NG6
14	Solenoid “a”
15	Optional auxiliary operating device
16	Mating connector without circuitry (separate order)
17	Mating connector with circuitry (separate order)
18	Seal ring
19	Integrated check valve, version "R"
20	Dimension for valve without manual override
21	Dimension for valve with concealed manual override "N9"
22	Dimension for valve with manual override "N"
23	Space required to remove the coil
24	Lock nut SW17, tightening torque MA = 10+5 Nm

With directional seat valve

Dimensions in mm

1	Name plate
2	Omitted with internal pilot oil return
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	Switching shock damping sandwich plate, optional
10	Space required to remove the key
11	Space required to remove the mating connector
12	Valve mounting bores
13.2	Directional seat valve NG6
14	Solenoid “a”
15	Optional auxiliary operating device
16	Mating connector without circuitry (separate order)
17	Mating connector with circuitry (separate order)
18	Seal ring
19	Integrated check valve, version "R"
23	Space required to remove the coil
24	Lock nut SW17, tightening torque MA = 10+5 Nm

Standardflansche, Ausführung „DBA(R)…F“

Version	L1	L2	L3	L4	B1	B2	B3	B4	B5	B6	H1	H2	H3	H4	H5	H6	ØD1	ØD3
Version	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
DBA32...F	121	138	55	38.5	30.2	58.7	65	48.3	-	-	105	125	43	85	43	-	11	45
DBA40...F	138	156	54.5	49.5	35.8	69.9	74.5	54.7	-	-	118	138	50	98	56	-	13	54
DBAR32...F	121	138	55	38.5	30.2	58.7	65	48.3	60	80	105	125	43	85	43	9	11	40
DBAR40...F	138	156	54.5	49.5	35.8	69.9	74.5	54.7	60	100	118	138	50	98	56	8	13	54

NG	Version	Ports		4 valve mounting screws ISO 4762 - 10.9 1)		Tightening torqueMA in Nm 2)
		P and P1	T		Part number
32	„DBA“	SAE 1 1/4“	G1 1/4	M10 x 120	R913000074	52
	„DBAR“			M10 x 125	R913000668
40	„DBA“	SAE 1 1/2“	G1 1/2	M12 x 135	R913024229	77
	„DBAR“			M12 x 140	R913000312

High-pressure flanges, version “DBA(R)…H“

Version	L1	L2	L3	L4	B1	B2	B3	B4	B5	B6	H1	H2	H3	H4	H5	H6	ØD1	ØD3
Version	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
DBA32...H	121	138	55	38.5	31.8	66.7	65	48.3	-	-	105	125	43	85	43	-	15	45
DBA40...H	138	156	54.5	49.5	36.6	79.4	74.5	54.7	-	-	118	138	50	98	56	-	17	54
DBAR32...H	121	138	55	38.5	31.8	66.7	65	48.3	60	90	105	125	43	85	43	8	15	40
DBAR40...H	138	156	54.5	49.5	36.6	79.4	74.5	54.7	65	110	118	138	50	98	56	8	17	54

NG	Version	Ports		4 valve mounting screws ISO 4762 - 10.9 1)		Tightening torqueMA in Nm 2)
		P and P1	T		Part number
32	„DBA“	SAE 1 1/4“	G1 1/4	M14 x 135	R913024230	113
	„DBAR“			M14 x 145	R913024233
40	„DBA“	SAE 1 1/2“	G1 1/2	M16 x 155	R913024234	184
	„DBAR“			M16 x 160	R913000354

	1)Valve mounting screws (separate order)
	4 hexagon socket head cap screws ISO 4762 - 10.9-flZn-240h-L
	(with friction coefficient μtotal = 0.09 … 0.14)
	Attention!
	For reasons of stability, other valve mounting screws must not be used!
	2) The tightening torques are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %).

Admissible pressures (flange connections according to DIN ISO 6162-2)

	Pressure
	bar
SAE 1 1/4″	250
SAE 1 1/2″	200

Admissible pressures (flange connections according to DIN ISO 6162-2)

	Pressure
	bar
SAE 1 1/4″	350
SAE 1 1/2″	350

Safety instructions: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/EC

Before ordering a type-examination tested safety valve, it must be ensured that at the desired response pressurep, the maximum admissible flowqV max (= numerical value at the position of letter "G" in the component marking) of the safety valve is higher than the maximum possible flow of the system/accumulator to be secured. In this respect, the applicable regulations must be observed! According to PED 97/23/EC, the increase in the system pressure due to the flow must not exceed 10 % of the set response pressure (see component marking).

The maximum admissible flow qV max 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 lines must not be possible (see AD2000 - data sheet A2).

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 due to spring pretensioning (item 9 on page 5) 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

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 specified in the component marking applies to:

External pilot oil return “Y” without counter pressure in the pilot oil return line, admissible counter pressure in the discharge line (port T) <15 bar

Internal pilot oil return "–“ 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 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 characteristic curves Safety instructions, Type-examination tested safety valves).

By removing a lead seal at the safety valve, the approval according to the PED becomes void Basically, the requirements of the Pressure Equipment Directive and of data sheet AD2000 A2 have to be observed!

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Ordering code: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/EC

NG	Type designation	Component marking	Maximum flow qVmax in l/min with pilot oil return		Set response overpressurep in bar
			external "Y"	internal "–"
32	2 3 4 5 6 DBA 30 ▢▢N1X/▢▢▢E	TÜV.SV.▢–938.22.F.G.p	200	175	30 ... 60
	2 3 4 5 6 DBAR 30 ▢▢N1X/▢▢▢E		400	260	61 ... 110
40	2 3 4 5 6 DBA 40 ▢▢N1X/▢▢▢E	TÜV.SV.▢–939.22.F.G.p	350	300	30 ... 60
	2 3 4 5 6 DBAR 40 ▢▢N1X/▢▢▢E		450	350	61 ... 110

2	Standard flange	F
2	High-pressure flange	H
Adjustment type
3	Hand wheel (pressure adjustment sealed, unloading or setting of a lower response pressure possible!)	1
3	With sealed protective cap (no adjustment/unloading possible)	2
4	Pressure in the designation is to be entered by the customer, pressure adjustment ≥ 30 ... 350 bar and possible in 5 bar steps.	z. B. 150
Pilot oil supply and return
5	Internal	– 1)
5	Recommendation: Internal pilot oil supply, external pilot oil return (ordering code according to symbols)	Y
6	NBR seals	no code
6	FKM seals	V
	Value entered at the factory	1X

	1) Dash “–” only necessary if 12 and 13 = “no code” (see ordering code)

PUMP SAFETY BLOCK DBA40H2N1X/350

Manufacturer: Bosch Rexroth

Material #: R900956020

Model : DBA40H2N1X/350

More are expected on April 22, 2025

This product is eligible for factory repair.

general

hydraulic

Deviating technical data: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/E C1)

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

Standard version

Version “U”

Inlet pressure dependent on the flow

Maximum admissible flow qV max dependent on the counter pressure pT in the discharge line with internal pilot oil return

Type DBA …–..

Type DBA …Y..

Type DBAR …–..

Type DBAR …Y..

With directional spool valve

With directional seat valve

Standardflansche, Ausführung „DBA(R)…F“

High-pressure flanges, version “DBA(R)…H“

Admissible pressures (flange connections according to DIN ISO 6162-2)

Safety instructions: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/EC

Ordering code: Type-examination tested safety valves type DBA…E, component series 1X according to Pressure Equipment Directive 97/23/EC

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