DBW52BF2-3X/315U6EG24N9DA/V

Manufacturer: Bosch Rexroth

Material #: R978911459

Model : DBW52BF2-3X/315U6EG24N9DA/V

***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 DBW52BF2-3X/315U6EG24N9DA/V (R978911459) is a sophisticated pilot-operated pressure relief valve designed for the effective limitation of system pressure within hydraulic circuits. This valve is characterized by its ability to maintain system pressure within desired parameters, thereby ensuring the safety and efficiency of hydraulic operations. The DBW52BF2-3X/315U6EG24N9DA/V features a main valve with a main spool insert and an optional directional valve, which together work to provide precise control over fluid flow and pressure. One key capability of this relief valve is the unloading of the main spool through control of the mounted directional valve. This feature is particularly beneficial for reducing tank pressure peaks when transitioning to depressurized circulation. The switchoff time of the valve can be adjusted by exchanging the default nozzle, allowing operators to tailor the response time to specific application requirements without affecting the pressure limiting function. The DBW52BF2-3X/315U6EG24N9DA/V also offers flexibility in mounting and adjustment options, with provisions for both flange connection and subplate mounting. Operators can choose between various adjustment elements such as a sleeve with hexagon and protective cap, a rotary knob, or a lockable rotary knob for precise pressure adjustments. Additionally, it supports solenoid-actuated unloading via a built-on directional valve, providing further control versatility. This model includes options for both internal and external pilot oil return and an optional remote control port. The main spool insert can be configured as either a seat spool or as a sliding spool design according to user preference or application demands. It is engineered to handle maximum operating pressures up to bar levels (specific value not provided) and maximum flow rates measured in liters per minute (specific value not provided), making it suitable for various industrial applications requiring reliable pressure management.

$14,388.00 USD

More are expected on May 20, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as May 20, 2025 when ordered in

This product is eligible for factory repair.

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For flange connection For subplate mounting 3 adjustment elements for pressure adjustment, optional:
• Sleeve with hexagon and protective cap
• Rotary knob
• Lockable rotary knob Solenoid-actuated unloading via a built-on directional valve Pilot oil return, internal or external Remote control port, optional Main spool insert optionally as seat spool or as sliding spool design

Pressure valve type DBW is a pilot-operated pressure relief valve. It is used for limiting (DBW) a system pressure.

The pressure relief valves basically consist of the pilot control valve (1) with pressure adjustment element (2), main valve (3) with main spool insert (4) and directional valve (5), optional.

Pressure relief valves type DBW

In principle, the function of this valve is the same as that of valve type DBW. The unloading of the main spool (4) is, however, achieved by controlling the mounted directional valve (5).

To reduce the tank pressure peaks when switching to depressurized circulation by operating the directional valve, the main spool in sliding spool design (4.1) can be used.

Influencing of the switch-off time

The nozzle (9), by default equipped with Ø0.8 mm, is used to influence the switch-off time. By exchanging this nozzle (9), the switch-off time can be set to a slower or faster value.

The pressure limiting function is thus not influenced.

Principle:

Type DBW 52 BP2.3X/…XYU6EG24N9K4

With type DBW 52 …Y…, the connection T–Y is closed.

4.1	Sliding spool
4.2	Seat control spool

01	02	03	04	05	06	07	08		09	10	11	12	13	14	15	16	17	18
DB		52					3X	/			U							*

01	Pressure relief valve		DB
02	with attached directional valve		W
03	Size 52		52
04		Normally closed	A1)
		Normally open	B1)
Version
05	For subplate mounting		P
	for flange connection		F
Adjustment type for pressure adjustment
06	Rotary knob		1
	Sleeve with hexagon and protective cap		2
	Lockable rotary knob		32)
Main piston
07	in seat spool design		–
	in sliding spool design		L
08	Component series 30 ... 39 (30 ... 39: unchanged installation and connection dimensions)		3X
Pressure rating
09	Set pressure up to 100 bar		100
	Set pressure up to 315 bar		315
Pilot oil supply
10	Ordering code according to symbols		–
			X
			Y
			XY
11	for minimum cracking pressure 3 bar		U
12	with directional valve NG6		6E1)
13	Direct voltage 24 V		G241)
	Alternating voltage 230 V, 50/60 Hz		W2301)
14	With concealed manual override		N91)
	With manual override		N1)
Electrical connection Individual connection
15	without mating connector with connector DIN EN 175301-803		K43)
Seal material
16	NBR seals		no code
	FKM seals (other seals upon request)		V
	Observe compatibility of seals with hydraulic fluid used.
Type-examination procedure
17	Without type-examination procedure		no code
	Type-examination tested safety valve according to PED 2014/68/EU		E
18	Further details in the plain text		*

	1) Ordering code only necessary with versions with mounted directional valve (DBW).
	2) H-key with the order no. R900008158 is included in the scope of delivery
	3) Mating connectors, separate order

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

Minimum stability of the materials for subplates, flanges, etc.:

The materials are to be selected so that there is sufficient safety for all imaginable operating conditions, e.g. for pressure resistance, thread stripping strength and tightening torques.

hydraulic

Version			Pilot oil flow "no code"	Pilot oil flow "Y"
Maximum counter pressure	Port Y	bar	-	0
	Port T		See characteristic curves and explanatory notes for maximum counter pressure	PT < 15
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 and DIN 51524-1
Viscosity range		mm²/s	12 … 230

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oil		HL, HLP	FKM, NBR	DIN 51524
Bio-degradable	Insoluble in water	HEES (synthetic esters)	FKM	VDMA 24568
	Insoluble in water	HETG (rape seed oil)	FKM, NBR	VDMA 24568
	Soluble in water	HEPG (polyglycols)	FKM	VDMA 24568
Other hydraulic fluids on request

Deviating technical data for type-examination tested safety valves 1)

hydraulic

Size			52
Maximum operating pressure	Port P	bar	315
	Port X	bar	315
	Port T	bar	315
Maximum counter pressure	Port Y (DC solenoid) 1)	bar	210
Maximum counter pressure	Port T (AC solenoid) 2)	bar	160
Minimum set pressure			flow-dependent, see characteristic curves
Maximum set pressure		bar	100 315
Maximum flow		l/min	2000
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
Hydraulic fluid temperature range	FKM seals	°C	-15 … +80
Viscosity range		mm²/s	10 … 380
Maximum admissible degree of contamination of the hydraulic fluid 3)			Class 20/18/15 according to ISO 4406 (c)

1)	DC solenoid
2)	AC solenoid
3)	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.

general

Size			52
Weight (approx.)		kg	28.5
Installation position			any
Ambient temperature range	NBR seals	°C	-30 … +50
Ambient temperature range	FKM seals	°C	-15 … +50

For applications outside these parameters, please consult us!

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

Die characteristic curve were measured with external pilot oil return and depressurized pilot oil return flow.

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

1	Main spool insert with sliding spool
2	Main spool insert with seat spool

pA	Response pressure in bar
pT	max. admissible counter pressure in the discharge line (port T) (sum of all possible counter pressures; also see AD2000 data sheet - A2)
	10 % x pA (with qV = 0 l/min)
	maximum admissible flow in l/min

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

Type DBW 52 ..3X/...E

Characteristic curves for intermediate values can be generated by interpolation.

1	Main spool insert with sliding spool
2	Main spool insert with seat spool

pA	Response pressure in bar
pT	max. admissible counter pressure in the discharge line (port T) (sum of all possible counter pressures; also see AD2000 data sheet - A2)
	10 % x pA (with qV = 0 l/min)
	maximum admissible flow in l/min

Explanation of the diagram
Example:
known:	system/accumulator flow to be secured	qVmax = 500 l/min
	set response pressure of the safety valve	pA = 210 bar
unknown:	pT = ~^&@@&^~
Solution:	see arrows in diagram:	pT(500 l/min; 210 bar) = 10 bar

Type DBW 52 …–..

Type DBW 52 …X..

Type DBW 52 …Y..

Type DBW 52 …XY..

Flange connection

Dimensions in mm

1	Pilot control valve
2	Adjustment type "1"
3	Adjustment type "2"
4	Adjustment type "3"
5	Main valve
6	Directional seat valve NG6
7	Mating connector without circuitry (separate order)
8	Mating connector with circuitry (separate order)
9	Space required to remove the mating connector
10	Dimension for valve with DC solenoid
11	Dimension ( ) for valve with AC solenoid
12	Optional auxiliary operating device
13	Connection flanges (T and P)
14	Pressure gauge connection
15	Name plate
18	Valve mounting bores

Attention!

Please use the existing mounting bores to fix the valve so that the reaction forces can be absorbed in a risk-free manner!

Subplate mounting

Dimensions in mm

1	Pilot control valve
2	Adjustment type "1"
3	Adjustment type "2"
4	Adjustment type "3"
5	Main valve
6	Directional seat valve NG6
7	Mating connector without circuitry (separate order)
8	Mating connector with circuitry (separate order)
9	Space required to remove the mating connector
10	Dimension for valve with DC solenoid
11	Dimension ( ) for valve with AC solenoid
12	Optional auxiliary operating device
14	Pressure gauge connection
15	Name plate
16	Identical seal rings for ports P and T
17	Identical seal rings for ports X and Y
18	Valve mounting bores

Valve mounting screws for flange connection (separate order)

2 hexagon socket head cap screws ISO 4762 - M12 - 10.9

Valve mounting screws for subplate mounting (separate order)

6 hexagon socket head cap screws ISO 4762 - M16 x 150 - 10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 229 Nm ± 10 %,

material no. R913000154

Subplate for subplate mounting (separate order):

G 479/10

Safety instructions: Type-examination tested safety valves (type DBW 52 ...E) according to Pressure Equipment Directive 97/23/EC

The unloading function (directional valve function with DBW) must not be used for safety functions! With type DBW 52 B..3X/..., the lowest adjustable pressure (circulation pressure) is set in case of power failure or cable break. With type DBW 52 A..3X/..., 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 7 on page 4 in the pilot control valve/adjustment unit

pspring = 200 bar

Hydraulic counter pressure in port T with internal pilot oil return

phydraulic = 50 bar

=> Response pressure pspring + phydraulic = 250 bar

Before ordering a type-examination tested safety valve, it must be observed that for the desired response overpressure p, the maximum admissible flow qV max of the safety valve must be larger than the maximum possible flow of the system. 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). Discharge lines (ports T and Y) 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 Directive 97/23/EC and of data sheet AD2000 A2 must be generally observed! Attention! Possible unloading via the directional valve must not be applied for safety-relevant functions! If unloading is required for safety-relevant functions, an additional safety valve must be installed.

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 12 l/min.

The maximum admissible flow 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.

It applies to:

Pilot oil return “external” (= Y in the ordering key) without counter pressure in the discharge line Y, admissible counter pressure in the discharge line (port T) < 15 bar Pilot oil return “internal” (= no code in the ordering key). The maximum admissible flow is only admissible 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) 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 diagram Safety instructions, Type-examination tested safety valves).

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 DBW 52 ...E) according to Pressure Equipment Directive 97/23/EC

Designation	Component marking	Maximum admissible flow qVmax in l/min with pilot oil return		Set response overpressurep in bar
		external "Y"	internal "–"
1 2 3 4 5 6 7 DBW 52 ▢▢▢▢3X/▢▢U6 ▢▢E	TÜV.SV.▢ – 734.46.F.G.p	1000 1500 2000	500 1000 1500	50 ... 110 111 ... 210 211 ... 315

1 ▢	Directional valve, normally closed	A
1 ▢	Directional valve, normally open	B
2 ▢	For subplate mounting	P
2 ▢	for flange connection	F
3 ▢	Adjustment element hand wheel (pressure adjustment sealed, unloading or setting of a lower response pressure possible)	1
3 ▢	Adjustment element with sealed protective cap (no adjustment/unloading possible)	2
4 ▢	Valve with seat main spool	–
4 ▢	Valve with sliding main spool	L
5 ▢	Pressure in the designation is to be entered by the customer, e.g. pressure adjustment ≥ [si]50 bar[/si][imp]725 psi[/imp] and possible in [si]5 bar[/si] [/imp]75 psi[/imp] steps.	150
6 ▢	Pilot oil supply and return, internal	– 1) 2)
6 ▢	Recommendation Internal pilot oil supply, external pilot oil return	Y 2)
7 ▢	NBR seals	no code
7 ▢	FKM seals	V
▢	Value entered at the factory

	1) Dash “–” only necessary with version with attached directional valve
	2) External pilot oil supply “X” not possible!

DBW52BF2-3X/315U6EG24N9DA/V

Manufacturer: Bosch Rexroth

Material #: R978911459

Model : DBW52BF2-3X/315U6EG24N9DA/V

More are expected on May 20, 2025

This product is eligible for factory repair.

Principle:

Type DBW 52 BP2.3X/…XYU6EG24N9K4

hydraulic

Deviating technical data for type-examination tested safety valves 1)

hydraulic

general

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

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

Type DBW 52 …–..

Type DBW 52 …X..

Type DBW 52 …Y..

Type DBW 52 …XY..

Flange connection

Subplate mounting

Safety instructions: Type-examination tested safety valves (type DBW 52 ...E) according to Pressure Equipment Directive 97/23/EC

Ordering code: Type-examination tested safety valves (type DBW 52 ...E) according to Pressure Equipment Directive 97/23/EC

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