DBA25F2-2X/50

Manufacturer: Bosch Rexroth

Material #: R900973892

Model : DBA25F2-2X/50

***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 DBA25F2-2X/50 (R900973892) is a pump safety block designed to be directly mounted onto SAE pressure ports of pumps, providing a pilot-operated pressure relief function. It serves to limit the operating pressure of hydraulic systems by integrating a valve block and a pressure limitation screw-in cartridge valve, as outlined in the DB K data sheet. An optional addition for this unit is the HED pressure switch, which can be installed on the valve block for electrical circuit control. This model features input and output ports P and P, with a tank line port T established through the opening of the pressure limitation valve. The standard model includes a cover plate for connection diagram NG and utilizes a main control spool that responds to pressure changes between ports P and P. The design allows for equilibrium maintenance at set operating pressures, facilitated by an internal flow from channel P to T. Equipped with a pressure gauge connection G1/4, it allows monitoring of operating pressures. For different applications, this pump safety block offers various adjustment types including rotary knobs and sleeves with hexagon options for precise pressure settings. Its maximum operating pressure reaches up to 350 bar with a maximum flow rate of 50 l/min. Notably, this product ensures low noise levels due to its direct flange mounting at the pump, contributing to quieter operation environments. It also features zero-pressure startup and low circulation pressure due to its proximity to the pump, ensuring quick response times and efficient performance in managing hydraulic system pressures.

$1,650.00 USD

More are expected on April 7, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 7, 2025 when ordered in

This product is eligible for factory repair.

Start Repair

Zero-pressure start-up and circulation of the pump Intended for direct mounting onto the SAE pressure port of the pump Low circulation pressure due to short distance Low compression volume for soft switching to depressurized circulation 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 Low noise level due to direct flange mounting at the pump

General

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

It is used for limiting (type DBA) the operating pressure.

Pump safety blocks generally consist of valve block (1) and pressure limitation screw-in cartridge valve type DB 20 K (2) (data sheet 25818). Optionally, a pressure switch type HED 8 (3) (data sheet 50061) can be installed on the valve block.

The valve housing is equipped with a port P for hydraulic fluid input and port P1 for hydraulic fluid output. In a branch of the through connection between these two ports, the pressure limitation screw-in cartridge valve can be found. By opening this valve, a connection to port T (tank line) is established.

At the standard model, connection diagram NG6 is covered with the cover plate (4). The pressure in the through connection (P - P1) has an effect on the main control spool (5) of the pressure limitation screw-in cartridge valve.

Via the nozzle bores (6 and 7), the pressure is at the same time applied to the poppet (8). If the pressure in port P exceeds the value set at spring (9), the poppet (8) opens against the spring (9).

Via the nozzle bores (6 and 7), the hydraulic fluid from channel P flows into the spring chamber (10) and is here internally directed via the control line (11) into the tank.

Due to the state of equilibrium at the main control spool (5), hydraulic fluid flows from channel P to channel T, maintaining the set operating pressure.

A pressure gauge connection (12) allows for the control of the operating pressure.

Pump safety block type DBA…D (with pressure switch)

The use of an electrical pressure switch type HED 8 (3) (data sheet 50061) enables activation and deactivation of an electric circuit via the control line (13).

In basic design, the control line (13) is closed with a plug screw (14).

The pressure gauge connection M and tank port T are illustrated with an offset of 90 °!

01	02	03	04	05	06	07	08		09	10	11	12	13	14	15	16	17	18	19
DBA							2X	/

Type
01	Pump safety block (connection diagram NG6 covered with cover plate HSA 06 A 001…)	DBA
02	Without directional valve	no code
Size
03	Size 16	15
	Size 25	25
	Size 32	30
04	Without directional valve	no code
Type of connection / SAE flange 1)
05	Standard flange (250 … 350 bar)	F
05	High-pressure flange (350 bar)	H
Adjustment type for pressure adjustment 2)
06	Rotary knob	1
	Sleeve with hexagon and protective cap	2
	Lockable rotary knob with scale	3 7)
	Rotary knob with scale	7
07	Without pressure switch	–
07	With mounted pressure switch type HED 8 OH… (connector according to DIN EN 175301-803, without mating connector), (data sheet 50061)	D 3)
Component series
08	Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions)	2X
Pressure rating 5)
09	Set pressure up to 50 bar	50
	Set pressure up to 100 bar	100
	Set pressure up to 200 bar	200
	Set pressure up to 315 bar	315
	Set pressure up to 350 bar	350
10	Without additional pressure relief valve	no code
11	Standard version	no code
11	Valve for minimum cracking pressure	U
12	Without directional valve	no code
13	Without manual override	no code
Electrical individual connection
14	Without mating connector; connector DIN EN 175301-803	K4 3)
Interface electronics
15	Without electronics	no code
Nozzle fitting
16	Fixed pumps
	Lateral channel closed, transverse channel open, pilot oil bore open; (standard for displacement pumps; pure DB-/DBW function)	no code
	Variable displacement pumps
	Lateral channel closed, transverse channel open, pilot oil bore closed (e.g. for axial piston variable displacement pump type A4VSO140 with DRG controller)	A00
	Nozzle Ø0.8 mm in lateral channel, transverse channel open; pilot oil bore closed (standard for control pumps with DFR1 or DFLR controller)	A08 4)
	Nozzle Ø1.0 mm in lateral channel, transverse channel open; pilot oil bore closed (for nozzle fitting of the block, refer to the circuit examples)	A10 4)
Seal material 6)
17	NBR seals	no code
17	FKM seals	V
Type-examination procedure
18	Without type-examination procedure	no code
18	Type-examination tested safety valve according to PED 2014/68/EU	E
19	Standard solenoid coil	no code
19	Solenoid coil is an approved component with UR-marking according to UL 906 (only version "6E")	= UR

	1) Observe pressure ratings and connection dimensions!
	2) Adjustment type for pressure switch type HED 8 in brackets!
	3) Mating connectors, separate order
	4) If used on variable displacement pumps with DFLR controllers, the nozzle at port X of the pump control must be removed!
	5) The same pressure rating at pressure limitation screw-in cartridge valves type DB 20 K, pressure relief valve (sandwich plate valve) type Z(2)DB 6 and pressure switches type HED 8.
	6) Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
	7) H-key with material no. R900008158 is included in the scope of delivery.

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

general

Size				16	25		32
Earth	Pump safety block	DBA...	kg	5.4		5.3	5.4	6
	Pressure switches	HED 8	kg	0.8
Installation position				any
Ambient temperature range	NBR seals		°C	-30 … +80		-
	FKM seals		°C	-		-15 … +80

hydraulic

Size			16	25		32
Maximum operating pressure	Port P	bar	350
Maximum counter pressure	Port T	bar	250
Minimum set pressure			flow-dependent, see characteristic curves
Maximum set pressure		bar	50 100 200 315 350
Maximum flow		l/min	300	400
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80		-
	FKM seals	°C	-		-20 … +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	NBR, FKM	DIN 51524	90220
Bio-degradable	Insoluble in water	HETG	NBR, FKM	ISO 15380	90221
	Insoluble in water	HEES	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Water-free	HFDU, HFDR	FKM	ISO 12922	90222
Flame-resistant	Containing water	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620 )	NBR	ISO 12922	90223

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 40K higher than the maximum surface temperature.

Flame-resistant – containing water:

Maximum pressure differential per control edge 50bar Pressure pre-loading at the tank port >20 % of the pressure differential; otherwise, increased cavitation Life cycle as compared to operation with mineral oil HL, HLP 50 … 100 %

Bio-degradable and flame-resistant:

If these hydraulic fluids are used, small amounts of dissolved zinc may get into the hydraulic system.

Deviating technical data’: Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

hydraulic

Maximum flow		See ordering code, safety instructions and characteristic curves "Type-examination tested safety valve"
Hydraulic fluid		Mineral oil (HL, HLP) according to DIN 51524-1 and DIN 51524-2
Hydraulic fluid temperature range	°C	-10 … +60
Viscosity range	mm²/s	12 … 230

For applications outside these parameters, please consult us!

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

Inlet pressure dependent on the flow 2)

1)	The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.

Notice!

The characteristic curves were measured with internal pilot oil return.

Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port T.

Minimum set pressure and circulation pressure dependent on the flow 1)
Standard version

1)	The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.

Minimum set pressure and circulation pressure dependent on the flow 1)
Version “U”

1)	The characteristic curves apply to an output pressure pT =0 bar in the entire flow range.

Safety instructions:Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

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

Type DBA 15 …-2X/…E

Characteristic curves for intermediate values can be generated by interpolation. Further explanations see below.

pA	Response pressure in bar
pT	Maximum admissible counter pressure in the discharge line in bar (port T) (sum of all possible counter pressures; also see AD2000 data sheet A2)
pT max	10 % x pA (with qV = 0) according to PED 2014/68/EU
qV max	Maximum admissible flow in l/min

Explanation of the diagrams (Example: type DBA 15...E):
known:	Flow of the system/accumulator that has to be secured qVmax = 100 l/min
	Set response pressure of the safety valve pA = 315 bar
unknown:	pTadmissible
Solution:	see arrows in diagram above
	pT admissible (100 l/min; 315 bar) = 15.75 bar

Type DBA 25 …-2X/…E and type DBA 30 …-2X/…E

pA	Response pressure in bar
pT	Maximum admissible counter pressure in the discharge line in bar (port T) (sum of all possible counter pressures; also see AD2000 data sheet A2)
pT max	10 % x pA (with qV = 0) according to PED 2014/68/EU
qV max	Maximum admissible flow in l/min

General circuit example set-up

Arrangement of the nozzles/plugs items 17.1, 17.2 and 17.3

Circuit examples: for displacement pumps (selection)

Dimensions in mm


Required surface quality of the valve contact surface

1	Name plate
2	Cover plate type HSA 06 A001-3X… (data sheet 48042)
3	Port X for variable displacement pump type A10VSO (otherwise closed); G1/4
4	Port M for pressure gauge; G1/4
5	Mating connector without circuitry (separate order)
6	Mating connector with circuitry (separate order)
7	Pressure switch type HED 8 OH… (data sheet 50061)
8	Adjustment type "1" 1)
9	Adjustment type "2" 1)
10	Adjustment type "3" 1)
11	Adjustment type "7" 1)
12	Hexagon SW10
13	Space required to remove the key
14	Space required to remove the mating connector
15	Seal ring
24	Hexagon SW30, tightening torque MA = 50 Nm (For tightening, a manual torque wrench with a tolerance ≤ 10 % must be used.)
25	Lock nut SW22, tightening torque MA = 10±5 Nm
28	Valve mounting bores

Standard flanges type DBA…F…


NG	L1	L2	L3	B1	B2	B3	B4	B5	B6	H1	H2	H3	H4	H5	ØD1
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	88	117	22.2	47.6	28.5	45	80	110	105	24	47	22	60	37	11
25	88	115.5	26.2	52.4	28.5	45	80	110	105	24	47	22	60	37	11
32	108.5	108.5	30.2	58.7	30.5	47	80	110	105	30	47	20	60	41	11.5

High-pressure flanges type DBA…H...

NG	L1	L2	L3	B1	B2	B3	B4	B5	B6	H1	H2	H3	H4	H5	ØD1
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	88	117	23.8	50.8	28.5	45	80	110	105	24	47	22	60	37	11
25	84	115.5	27.8	57.2	28.5	45	80	110	105	24	47	22	60	37	13
32	108.5	108.5	31.8	66.7	26	52	90	115	105	30	50	20	64	41	15

Standard flanges type DBA…F… according to DIN ISO 6162-1
Size	Line connections			4 valve mounting screws ISO 4762 - 10.9 1)		Tightening torqueMA in Nm 2)
Size	P and P1	T	X, M		Part number	Tightening torqueMA in Nm 2)
16	SAE 3/4″	G3/4	G1/4	M10 x 95	R913015585	52
25	SAE 1″	G1	G1/4	M10 x 95	R913015585	52
32	SAE 1 1/4″	G1 1/4	G1/4	M10 x 95	R913015585	52

Admissible pressures (flange connections according to DIN ISO 6121-1)
	in bar
SAE 3/4″	350
SAE 1″	315
SAE 1 1/4″	250

	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)

High-pressure flanges type DBA…H… according to DIN ISO 6162-2
Size	Line connections			4 valve mounting screws ISO 4762 - 10.9 1)		Tightening torqueMA in Nm 2)
Size	P and P1	T	X		Part number	Tightening torqueMA in Nm 2)
16	SAE 3/4″	G3/4	G1/4	M10 x 95	R913015585	52
25	SAE 1″	G1	G1/4	M12 x 105	R913000659	66
32	SAE 1 1/4″	G1 1/4	G1/4	M14 x 105	R913000660	113

Admissible pressures (flange connections according to DIN ISO 6121-2)
	in bar
SAE 3/4″	350
SAE 1″	350
SAE 1 1/4″	350

	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)

2)Notice!

The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %).

Notice!

For reasons of stability, other valve mounting screws must not be used!

Depending on the operating pressure, flange height and thread depth of the pump plate, other screw lengths may be necessary!

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

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

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 rectifier

3P RZ5

Mating connectors for valves with connector “K4”, with rectifier

3P RZ5

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 mechanical pressure switches with connector “K14”, without circuitry, standard

4P Z14

Mating connectors for mechanical pressure switches with connector “K14”, without circuitry, standard

4P Z14

For mechanical pressure switches with connector “K14”, according to EN 175301-803 and ISO 4400, 3-pole + PE, “large cubic connector”

Data sheet

Spare parts & repair

Mating connectors for mechanical pressure switches with connector “K14”, with indicator lights at connections 2 and 3

4P Z15L

Mating connectors for mechanical pressure switches with connector “K14”, with indicator lights at connections 2 and 3

4P Z15L

For mechanical pressure switches with connector “K14”, according to EN 175301-803 and ISO 4400, 3-pole + PE, “large cubic connector”

Data sheet

Spare parts & repair

Ordering code: Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

Size	Type designation	Component marking	Maximum admissible flow qVmax in l/min with pilot oil return	Set response overpressurep in bar
16	2 3 4 5 6 7 DBA 15 ▢▢▢2X/▢▢▢E	TÜV.SV.▢‒1001.14,4.F.G.p	60 100 150 200 250	30 … 60 61 … 110 111 … 210 211 … 315 316 … 350
25	2 3 4 5 6 7 DBA 25 ▢▢▢2X/▢▢▢E	TÜV.SV.▢‒1001.14,4.F.G.p	70 100 150 200 300	30 … 60 61 … 110 111 … 210 211 … 315 316 … 350
32	2 3 4 5 6 7 DBA 30 ▢▢▢2X/▢▢▢E	TÜV.SV.▢‒1001.14,4.F.G.p	70 100 150 200 300	30 … 60 61 … 110 111 … 210 211 … 315 316 … 350

2	Standard flange (250 bar)	F
2	High-pressure flange (350 bar)	H
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	With mounted pressure switch type HED 8 OH… (without mating connector)	D
5	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
6	Without additional pressure relief valve	no code
	With mounted pressure relief valve type ZDB 6 VB…-4X/..SO2 (data sheet 25751)	Z
	With mounted pressure relief valve type Z2DB 6 VC…-4X/..SO2 (data sheet 25751)	ZZ
	Versions DBAW…Z(Z)E and DBAE(E)…E are only available with ordering code "A00", "A08" or "A10"
7	NBR seals	no code
7	FKM seals	V
	Value entered at the factory

Safety instructions: Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

Before ordering a type-examination tested safety valve, it must be observed that for the desired response pressure p, the maximum admissible flow qVmax must be larger than the maximum possible flow of the system to be secured. In this respect, the applicable regulations must be observed! According to PED 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). The maximum admissible flow qVmax stated in the component marking (= numerical value instead of the character "G" in the component marking, see ordering code, type-examination tested safety valves) 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. If a lead seal at the safety valve is removed, the approval according to the PED! The requirements of the Pressure Equipment Directives 2014/68/EU and of data sheet AD2000 A2 must be generally observed! Options DBAE/DBAEE or 2nd/3rd pressure limiting function ( 6 ) are only possible for pressure relief valves for variable displacement pumps (also see ordering code).

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 11 l/min. The maximum admissible flow stated in the component marking applies for applications without counter pressure in the discharge line (port T).

Notice!

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

DBA25F2-2X/50

Manufacturer: Bosch Rexroth

Material #: R900973892

Model : DBA25F2-2X/50

More are expected on April 7, 2025

This product is eligible for factory repair.

general

hydraulic

Deviating technical data’: Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

hydraulic

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

Inlet pressure dependent on the flow 2)

Minimum set pressure and circulation pressure dependent on the flow 1) Standard version

Minimum set pressure and circulation pressure dependent on the flow 1) Version “U”

Safety instructions:Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

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

Type DBA 15 …-2X/…E

Type DBA 25 …-2X/…E and type DBA 30 …-2X/…E

General circuit example set-up

Arrangement of the nozzles/plugs items 17.1, 17.2 and 17.3

Circuit examples: for displacement pumps (selection)

Standard flanges type DBA…F…

High-pressure flanges type DBA…H...

Ordering code: Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

Safety instructions: Type-examination tested safety valves type DBA…E, component series 2X according to Pressure Equipment Directive 2014/68/EU

Related Products

Information

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Minimum set pressure and circulation pressure dependent on the flow 1)
Standard version

Minimum set pressure and circulation pressure dependent on the flow 1)
Version “U”