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BOSCH REXROTH
R901037547

Name: BOSCH REXROTH R901037547
Brand: BOSCH REXROTH
SKU: 1265289
Price: 1493.00 USD
Availability: OutOfStock

$1,493.00

BOSCH REXROTH

MATERIAL: R901037547

SUMMARY:

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General

2-way cartridge valves for pressure functions are pilot-operated valves in seat or spool design. The power section designed as cartridge valve (1) is installed into a receiving hole standardized according to DIN ISO 7368 and closed with a control cover (2).

The pilot control valve (4) for manual or electrically proportional pressure adjustment is integrated into the control cover (2) or is installed on the control cover (2) as pilot valve with mounting dimensions according to DIN 24 340.

By combination of cartridge valves with the control covers, different pressure functions can be realized. .

Pressure reducing function

Rest position closed

For the pressure reducing function with opening characteristic, a pressure limitation cartridge valve (type LC..DB40D...) and a control cover with a pressure reducing pilot control valve (type LFA..DR...) are applied. The pilot oil is directed from port A via the supply orifice and the opened pilot control valve to side B.

The main spool is opened and the flow from port A to port B is released.

On reaching the set pressure, the spool is closed and the pressure at port B is reduced according to the pressure-flow characteristics. Potential pressure increases on the secondary side are discharged to the tank via the 3rd way of the pilot control valve. Set-up of a directional valve enables realization of an additional blocking function (type LFA..DRW...).

Control cover for pressure reducing function

01	02	03		04		05	06
LFA		DREWZ	‒	7X	/	014

Type
01	Control cover LFA	LFA
Size
02	NG 25	25
	NG 32	63
	NG 40	40
	NG 50	50
	NG 63	63
Version
03	Pressure reducing function - Main spool in rest position closed (LC..DB 40 D..- separate order)	DREWZ
Component series
04	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions)	7X
Pressure rating (pressure reducing valve)
05	Set pressure up to 16 bar	014
Seal material
06	NBR seals	no code
06	FKM seals	V

Additional preferred types and standard units are specified in the EPS (standard price list).

Main spool in rest position closed - LC..DB 40 D..- separate order

Orifice symbol	Symbol in ordering code
A**	A**	This orifice is designed as screw-type orifice. If an orifice is to be installed, the respective code letter with the orifice Ø in 1/10 mm has to be entered in the type designation. Example: A12 = Orifice with Ø1.2 mm in channel A.
Ø1,2		This orifice is designed as bore. No specifications are made in the type designation. (Orifice Ø in mm)
Z12		This orifice is designed as screw-type orifice. This is a standard orifice. No specifications are made in the type designation. (Orifice Ø in 1/10 mm)

general

Size	25	32	40	50	63

hydraulic

Size			25	32	40	50	63
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
	FKM seals	°C	-20 … +80
Viscosity range		mm²/s	2.8 … 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.

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

Control cover

Size				25	32	40	50	63
maximum admissible operating pressure in port ...	...X (primary pressure)		bar	350
	...Y (secondary pressure = max. set pressure)		bar	350
	...Z2	static	bar	315
		at pressure control		depressurized (up to ≈ 2 bar)
	...T	static 1)	bar	100
		at pressure control		depressurized (up to ≈ 2 bar)

1)	according to the admissible tank pressure of the pilot control valves

For applications outside these parameters, please consult us!

Attention!

Control covers type LFA..DR... are combined with 2-way cartridge valves type LC..DB 40 D... (see ordering code).

(basic symbol) - Pressure reducing function

LFA..DREWZ-7X/014 NG 25, 32

LFA..DREWZ-7X/014 NG 40, 50

LFA..DREWZ-7X/014 NG 63

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

Dimensions in mm

5	Bore for locating pin (cover pin assembled according to DIN 24 342)
6	Information on porting pattern NG 16: Length L1 (axis x–y bores) is 80 mm
8	Bore for locating pin at function as main pressure relief valve (reposition cover pin for assembly accordingly)

Mounting screws (included in scope of delivery)
Hexagon socket head cap screw according to DIN 912-10.9
NG	Quantity	Dimensions	Tightening torque in Nm
16	4	M 8 x 45	32
25	4	M 12 x 50	110
32	4	M 16 x 60	270
40	4	M 20 x 70	520
50	4	M 20 x 80	520
63	4	M 30 x 100	1800

NG 16, 25, 32

Dimensions in mm

1	Port X optionally as threaded port (at NG 16...50)
3.1	Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63)
4	Locating pin
9.1	Name plate (NG16)
9.2	Name plate (NG 25, 32)

NG 40, 50

Dimensions in mm

1	Port X optionally as threaded port (at NG 16...50)
2	Port Y optionally as threaded port (at NG 40, 50)
3.1	Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63)
3.2	Port Z2 optionally as threaded port (at NG 40, 50, 63)
4	Locating pin
9.3	Name plate (NG 40, 50, 63)
10	Check valve (at NG 63 orifice F in poppet)

NG63

Dimensions in mm

3.1	Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63)
3.2	Port Z2 optionally as threaded port (at NG 40, 50, 63)
4	Locating pin
9.3	Name plate (NG 40, 50, 63)
10	Check valve (at NG 63 orifice F in poppet)
11	At control cover NG 63, logic element NG 16

NG 25 to 63

Dimensions in mm

8	Pressure reducing valve (included in the scope of delivery)
11	Valve mounting screws M5 DIN 912-10.9 MA = 8.9 Nm included in the scope of delivery
14	Control cover
16	Proportional pressure relief valve type DBET-5X/... 1) Y G24-12) (to be ordered separately)
17	Directional spool valve 3WE 6 A... (to be ordered separately)

	1) Pressure ratings for valve type:
	DBET-5X/... 50, 100, 200, 315 and 350 bar
	2) 1 = G 1/4 threaded port T; special cone

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

NG	H1	H2	H3	L1	L2	L3	L7
NG	mm	mm	mm	mm	mm	mm	mm
25	40 -	19 -	24	85 -	85	49	59
32	50 -	26 -	28	100 -	100	56.5	66.5

NG	Ø Orifice A**	Ø Orifice F** 1)	Ø Orifice D**	L1	L2	L8	L9	L10
NG	mm	mm	mm	mm	mm	mm	mm	mm
25	-	0.8	1.5 2)	85	85	15	42	30
32	-	1	1.5 2)	100	100	7.5	35	37.5
40	-	1.2	1.8 2)	125	125	-	22	50
50	-	1.5	1.8 2)	140	140	-	15	57.5
63	2 1)	1.5	1.8 1)	180	180	-	-	81.5

1)	Orifice Ø, orifice M6 conical
2)	Orifice Ø, orifice M8 x 1 conical

NG	H1	H2	H3	H4	H5	L1	L2	L3	L4	L5	L7
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
40	60 -	30 -	32	40	40	125 -	125	72	62.5	62.5	79
50	68 -	32 -	34	32	32	140 -	140	80	70	70	86.5

Configurator / CAD

Spare parts & repair

Configurator / CAD

General product information on hydraulic products

Installation, commissioning and maintenance of industrial valves

Spare parts & repair

BOSCH REXROTH
R901037547

Control cover for pressure reducing function

general

hydraulic