PRESSURE RELIEF VALVE DB52F2-3X/315U

Manufacturer: Bosch Rexroth

Material #: R900453821

Model : DB52F2-3X/315U

***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 DB52F2-3X/315U (R900453821) is a high-performance industrial hydraulic valve designed for reliable pressure relief up to the preset value. This mechanically actuated valve is pilot-operated, featuring a spool symbol P T, and can handle a maximum pressure of 315 bar. It falls under Productgroup ID and is equipped with multiple ports for fluid connection. The DB52F2-3X/315U offers a flange connection type and supports a maximum flow rate as specified by the manufacturer. The valve's construction includes a pilot control valve with an adjustable pressure element, a main valve with a main spool insert, and an optional directional valve. The system's pressure acts on the main spool, which is balanced by spring force and controlled through nozzles that regulate hydraulic fluid flow. When system pressure surpasses the set spring value, the pilot control valve allows fluid from the spring-loaded side of the main spool to flow to the tank, triggering the connection from P to T and maintaining operational pressure. Additionally, this model allows for remote control unloading or switching to different pressure settings via port X. It also provides options for influencing shut-off time by exchanging nozzles of different sizes. The DB52F2-3X/315U's functionality remains unaffected by these adjustments. For mounting flexibility, this valve can be attached via flange connection or subplate mounting. Users can choose between various adjustment elements for pressure settings including sleeves with hexagon and protective cap, rotary knob, or lockable rotary knob. Solenoid-actuated unloading through an attached directional valve is possible as well as internal or external pilot oil return options. Remote control ports are available optionally, while the main spool insert can be selected either as seat spool or sliding spool design according to application needs. With NBR seals compatible with hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, HFC types; this robust Bosch Rexroth pressure relief valve ensures efficient operation in demanding industrial environments while offering versatility through its configuration options.

$11,303.00 USD

More are expected on April 28, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 28, 2025 when ordered in

This product is eligible for factory repair.

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PRESSURE RELIEF VALVE DB52F2-3X/315U

Size 52, P → T, mechanically actuated

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

Unpacked Weight: 27.45 kg

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 DB is a pilot-operated pressure relief valve. It is used for limiting (DB) 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 DB

The pressure applied by the system acts on the main spool (4). At the same time, pressure is applied to the spring-loaded side of the main spool (4) and to the pilot control valve (1) via the control lines (6) which are equipped with nozzles. If the system pressure exceeds the value set at the spring (7), the poppet (10) of the pilot control valve opens. The hydraulic fluid on the spring-loaded side of main spool (4) now flows via the spring chamber of the pilot control valve (1) to the tank, either internally via port T, or externally, via port Y. Due to the nozzle combination in the control lines, a pressure drop results at the main spool, the connection from P to T is thus released. The hydraulic fluid flows from channel P to channel T maintaining the set operating pressure.

The pressure relief valve can be unloaded by means of remote control or switched to another pressure value via port X (8).

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.

Pilot-operated
Proportional pressure valve in poppet seat design
Component series 3X
Size 52
Maximum flow 2000 l/min
Maximum operating pressure 315 bar

Data Sheet	Download Data Sheet
3D CAD	Download 3D CAD
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Spool symbol	P → T
Max. pressure	315
Productgroup ID	9,10,11,12,13,14
Number of ports	2
Type of actuation	with mechanical actuation
Size	52
Max. flow	2000
Type of connection	Flange connection
Number of switching positions	2
Weight	27.45
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
DB		52					3X	/			U							*

01	Pressure relief valve	DB
02	Without directional valve	no code
03	Size 52	52
Version
05	For subplate mounting	P
05	for flange connection	F
Adjustment type for pressure adjustment
06	Rotary knob	1
	Sleeve with hexagon and protective cap	2
	Lockable rotary knob	3 1)
Main piston
07	in seat spool design	–
07	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
09	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	Without directional valve	no code
14	Without manual override	no code
Electrical connection Individual connection
Electrical connection Individual connection
15	without mating connector with connector DIN EN 175301-803	K42)
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
17	Type-examination tested safety valve according to PED 2014/68/EU	E
18	Further details in the plain text	*

	1) H-key with the order no. R900008158 is included in the scope of delivery
	2) Mating connectors, separate order

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

general

Size			52
Weight (approx.)		kg	27
Installation position			any
Ambient temperature range	NBR seals	°C	-30 … +80
Ambient temperature range	FKM seals	°C	-15 … +80

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 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

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
Hydraulic fluid temperature range			-10 … +60 °C
Viscosity range		mm²/s	12 … 230

hydraulic

Size			52
Maximum operating pressure	Port P	bar	315
	Port X	bar	315
	Port T	bar	315
Maximum counter pressure	Port Y	bar	315
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 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!

(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.

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)
pT max	10 % x pA (with qV = 0 l/min)
qV max	maximum admissible flow in l/min

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

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

Type DB 52 ..3X/...E

Characteristic curves for intermediate values can be generated by interpolation.

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)
pT max	10 % x pA (with qV = 0 l/min)
qV max	maximum admissible flow in l/min

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

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 DB 52 …–..

Type DB 52 …X..

Type DB 52 …Y..

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

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

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) withoutcounter 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 DB 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 "–"
2 3 4 5 6 7 DB 52 ▢▢▢3X/▢▢U ▢E	TÜV.SV.▢ – 734.46.F.G.p	1000 1500 2000	500 1000 1500	50 ... 110 111 ... 210 211 ... 315

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)
6 ▢	Recommendation Internal pilot oil supply, external pilot oil return	Y 1)
7 ▢	NBR seals	no code
7 ▢	FKM seals	V
▢	Value entered at the factory

	1) External pilot oil supply “X” not possible!

PRESSURE RELIEF VALVE DB52F2-3X/315U

Manufacturer: Bosch Rexroth

Material #: R900453821

Model : DB52F2-3X/315U

More are expected on April 28, 2025

This product is eligible for factory repair.

general

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

hydraulic

hydraulic

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

Type DB 52 …–..

Type DB 52 …X..

Type DB 52 …Y..

Type DB 52 …XY..

Flange connection

Subplate mounting

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

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

3P Z4

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

3P Z4

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

3P Z5L

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

3P Z5L

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

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

3P RZ5

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

3P RZ5

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

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