Pressure relief valve, pilot controlled DB...W65

Артикул: RX7509

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Pressure relief valve, pilot controlled DB...W65

Name: Pressure relief valve, pilot controlled DB...W65
Brand: Bosch Rexroth
SKU: RX7509

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Description

Size 10 … 25
Component series 4X
Maximum operating pressure 350 bar
Maximum flow 400 l/min

Features

For subplate mounting
Porting pattern according to ISO 6264-06-09-*-97 (NG10) and ISO 6264-08-13-*-97 (NG25)
For threaded connection
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
CE conformity according to the Low-Voltage Directive 2014/35/EU for electrical voltages >50 VAC or >75VDC

Product description

Valves of type DB are pilot-operated pressure relief valves. They are used for limitation of the operating pressure.

The valves basically consist of housing (1) and pilot control valve (2) with adjustment type.

The pressure applied to channel P acts on the main spool (3). Via the nozzle bores (4 and 5), the pressure is at the same time applied to poppet (6). If the pressure in channel P exceeds the value set at spring (7), poppet (6) opens against spring (7). Via the nozzle bores (4 and 5), the hydraulic fluid from channel P now flows into the spring chamber (8). From here, it is led into the tank internally (version "–"), via the control line (9 and 10), or externally (version "Y") via the control line (9 and 11).

Due to the state of equilibrium at the main spool (3), 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.

The pressure relief valve can be unloaded or switched to another pressure (second pressure rating) via port X (13).

DB 20 –1-4X/…W65

Type code

01	02	03	04		05		06	07	08	09	10	11
DB				–	4X	/					W65	*

01	Pressure relief valve	DB
Size
02	Size 10
	Subplate mounting "–"	10
	Threaded connection "G" (G1 1/2)	10
	Size 25
	Subplate mounting "–"	20
	Threaded connection "G" (G3/4)	15
	Threaded connection "G" (G1)	20
Type of connection
03	Subplate mounting	–
03	Threaded connection	G
Adjustment type
04	Rotary knob	1
	Sleeve with hexagon and protective cap	2
	Lockable rotary knob with scale	3 1)
	Rotary knob with scale	7
05	Component series 40 ... 49 (40 ... 49: unchanged installation and connection dimensions)	4X
Pressure rating
06	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
Pilot oil flow
07	Pilot oil supply internal, pilot oil return internal	no code
	External pilot oil supply, internal pilot oil return	X
	Internal pilot oil supply, external pilot oil return	Y
	External pilot oil supply, external pilot oil return	XY
08	Standard version	no code
08	Valve for minimum cracking pressure (not suitable for mutual relief!)	U
Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")
09	NBR seals	no code
09	FKM seals	V
10	Vertical installation position of the screw-in cartridge valve (cartridge)	W65
11	Further details in the plain text	*

1)	H-Key with material no. R900008158 is included in the scope of delivery.

Notice:

In case spare parts of the screw-in cartridge valve are required, always order type DB 20 K.-1X/.XY.

Technical data

general

Size			10	25
Weight	Subplate mounting "–"	kg	1.6	2.3
Weight	Threaded connection "G"	kg	2.95
Installation position			any
Ambient temperature range	NBR seals	°C	-20 … +80
Ambient temperature range	FKM seals	°C	-15 … +80
Conformity	CE according to Low-Voltage Directive 2014/35/EU tested according to		EN 60204-1:2006-01 and DIN VDE 0580, classified as component.

hydraulic

Size			10	25
Maximum operating pressure	Port P	bar	350
	Port X	bar	315
	Port T	bar	350
Hydraulic fluid			see table "Hydraulic fluid"
Hydraulic fluid temperature range	NBR seals	°C	-20 … +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
Maximum flow	Subplate mounting "–"	l/min	200	400
				G3/4	G1
	Threaded connection "G"	l/min	150	200	300
Maximum counter pressure	Port Y	bar	250
Minimum set pressure			flow-dependent, see "characteristic curves"
Maximum set pressure		bar	50 100 200 315 350

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.

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
Important information on hydraulic fluids: 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. Dependent on the hydraulic fluid used, the maximum ambient and hydraulic fluid temperature must not exceed 50 °C. In order to reduce the heat input into the component, a maximum duty cycle of 50% in continuous operation has to be set for on/off valves (measuring period 300 s). If this is not possible due to the function, an energy-reducing control of these components is recommended, e.g. via a PWM plug-in amplifier.

(For applications outside these values, please consult us!)

Diagrams/characteristic curves

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

Inlet pressure dependent on the flow

Notices:

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.

Subplate mounting

Minimum set pressure and circulation pressure dependent on the flow

Standard version

Minimum set pressure and circulation pressure dependent on the flow

Version “U”

Notices:

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 an output pressure pT =0 bar in the entire flow range.

Threaded connection

Minimum set pressure and circulation pressure dependent on the flow

Standard version

Minimum set pressure and circulation pressure dependent on the flow

Version “U”

Notices:

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 an output pressure pT =0 bar in the entire flow range.

Symbols/Circuit diagrams

"DB…–…"	"DB…X…"	"DB…Y…"	"DB…XY…"

Dimensions

Subplate mounting

Size 10

Dimensions in mm


Required surface quality of the valve contact surface

1	Name plate
2	Port X for remote control, optional
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	Lock nut SW22, tightening torque MA = 10±5 Nm
9	Hexagon SW10
10	Hexagon SW30, tightening torque MA = 50 Nm
11	Space required to remove the key
12	Locating pin
13	Valve mounting bores
14	Pressure gauge connection
15	Identical seal rings for ports P and T
16	Seal ring for port X
28	Porting pattern according to ISO 6264-06-09-*-97

Size 25

Dimensions in mm


Required surface quality of the valve contact surface

1	Name plate
2	Port X for remote control, optional
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	Lock nut SW22, tightening torque MA = 10±5 Nm
9	Hexagon SW10
10	Hexagon SW30, tightening torque MA = 50 Nm
11	Space required to remove the key
12	Locating pin
13	Valve mounting bores
14	Pressure gauge connection
15	Identical seal rings for ports P and T
16	Seal ring for port X
29	Porting pattern according to ISO 6264-08-13-*-97

Valve mounting screws (separate order)

Size

Quantity

Hexagon socket head cap screws

Material number

ISO 4762 - M12 x 50 - 10.9

(Friction coefficient μtotal = 0.09 … 0.14)

Tightening torque MA = 75 Nm ±10 %

R913015611

ISO 4762 - M6 x 50 - 10.9

(Friction coefficient μtotal = 0.09 … 0.14)

Tightening torque MA = 185 Nm ±10 %

R913015664

Notices:

For reasons of stability, exclusively the specified valve mounting screws may be used.

The tightening torques are guidelines, referring to the maximum operating pressure and when using a manual torque wrench (tolerance ±10 %).

Threaded connection

Dimensions in mm

1	Name plate
2	Port X for remote control, optional
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	Lock nut SW22, tightening torque MA = 10±5 Nm
9	Hexagon SW10
10	Hexagon SW30, tightening torque MA = 50 Nm
11	Space required to remove the key
17	Grub screw is omitted with internal pilot oil return

Version	D1	ØD2
Version		mm
DB.10.G	G1/2	34
DB.15.G	G3/4	42
DB.20.G	G1	47

Information

General information

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 by spring preload 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

Downloads

	Pressure relief valve, pilot-operated Data Sheet \| RE25818 \| 2021-10-01 \| English, United States \| PDF \| 857k Product Groups: Pressure relief valves Type DB…W65; DBW…W65; DB 20 K
	Pressure relief valve, pilot-operated Manual \| RE25818-B \| 2021-11-01 \| English \| PDF \| 404k Product Groups: Industrial Hydraulics Type DB20K.1X/...E

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