BOSCH REXROTH
R900940864

$1,605.00 USD

BOSCH REXROTH
Material:R900940864
Model:LFA25DRW2-7X/210

Due to extremely high demand, please call 920-337-0234 for availability

***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 LFA25DRW2-7X/210 (R900940864) is a high-quality hydraulic control cover designed for use with way cartridge valves, providing reliable and blockable pressure reduction capabilities. This product features a spool symbol DRW and can handle a maximum pressure as specified by the manufacturer. It is characterized by its manual type of actuation, allowing for precise manual adjustments to the pressure reduction process. With subplate mounting and an ISO connection diagram, the LFA25DRW2-7X/210 ensures compatibility with standardized installation surfaces, making it versatile for various hydraulic systems. The unit is constructed to accommodate seals made from NBR and can operate with an array of hydraulic fluids including HL, HLP, HLPD, HVLP, HVLPD, and HFC types. The LFA25DRW2-7X/210 stands out due to its ability to switch off pressure reduction when needed. In terms of design, it incorporates a spool design that enables the main spool to open and facilitate flow from port A to port B once the set pressure is reached. Any potential secondary side pressure increases are efficiently managed by discharging them to the tank via a third-way pilot control valve. This product also allows for additional functionalities such as blocking when used in conjunction with a directional valve. The control cover integrates or can be fitted with pilot control valves for either manual or electrically proportional pressure adjustments according to DIN standards. In summary, the Bosch Rexroth LFA25DRW2-7X/210 offers robust performance in pressure regulation tasks within hydraulic systems while providing flexibility through its combination capabilities with various cartridge valves and pilot control valves for diverse pressure functions.

Size 25, mechanical, blockable pressure reduction with installation surface ISO4401

Control cover for 2-way cartridge valves Reliable reduction of the pressure in connection with a 2-way cartridge valve according to the hydraulic symbol.

Unpacked Weight: 3.52 kg

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. .

technical illustration-R900940864-Size 25, mechanical, blockable pressure reduction with installation surface ISO4401

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...).

Pressure reduction that can be switched off
Size 16 … 100
Maximum operating pressure 420 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	Symbol DRW
Max. pressure	350
Productgroup ID	9,10,11,12,13,14
Type of actuation	Manual pressure reduction
Size	25
Type of connection	Subplate mounting
Connection diagram	ISO 7368
Weight	3.52
Seals	NBR
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HFC

Control cover for pressure reducing function

01	02	03	04		05		06	07
LFA		DRW		‒	7X	/

Type
01	Control cover LFA	LFA
Size
02	NG 16	16
	NG 25	25
	NG 32	63
	NG 40	40
	NG 50	50
	NG 63	63
	NG 80	80
	NG 100	100
Version
03	Pressure reducing function - Main spool in rest position closed (LC..DB 40 D..- separate order)	DRW
Adjustment type for pressure adjustment
04	Rotary knob	1
	Sleeve with hexagon and protective cap	2
	Lockable rotary knob with scale, incl. H-key	3
	Rotary knob with scale	4
Component series
05	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions)	7X
Pressure rating DBmax. (observe admissible pressure of the pilot control valve)
06	Set pressure up to 25 bar	025
	Set pressure up to 75 bar	075
	Set pressure up to 150 bar	150
	Set pressure up to 210 bar	210
	Set pressure up to 315 bar	315
Seal material
07	NBR seals	no code
07	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	16	25	32	40	50	63

hydraulic

Size			16	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				16	25	32	40	50	63
maximum admissible operating pressure in port ...	...X (primary pressure)		bar	315
	...Y (secondary pressure = max. set pressure)		bar	315
	...Z2	static	bar	60
		at pressure control		depressurized (up to ≈ 2 bar)

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).

The control covers are equipped with standard orifice fitting – optimized in our test area. Orifice specification in the type key is not necessary. Deviating operating conditions may require respective adjustment of the orifice size. The orifices are designed as screw-type orifices.

Orifice representation in symbol

(basic symbol) - Pressure reducing function

LFA..DRW.-7X/...NG 16

LFA..DRW.-7X/...NG 25, 32

LFA..DRW.-7X/...NG 40, 50

LFA..DRW.-7X/...NG 63

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

Dimensions in mm

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

NG16 ... 63

Dimensions in mm

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

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

5.1	Adjustment element "4"
5.2	Adjustment element "3"
6	Adjustment element "2"
7	Adjustment element "1"
8	direct operated pressure reducing valve (included in the scope of delivery)
9	Name plate of the pressure reducing valve
11	Valve mounting screws M5x50 DIN 912-10.9 MA = 8.9 Nm are included in the scope of delivery of the control cover
12	Pressure gauge connection G1/4; 12 mm deep; internal hexagon SW6
13	Space required to remove the key
14	Control cover
15	Lock nut SW24
16	at type .../315 → 50 mm

NG	H1	H2	H3	L1	L2	L3	L7
NG	mm	mm	mm	mm	mm	mm	mm
16	40 -	17 -	15	65 -	80	36.5	49
25	40 -	19 -	24	85 -	85	49	59
32	50 -	26 -	28	100 -	100	56.5	66.5

Valve dimensions

NG	Ø Orifice A**	Ø Orifice X** 1)	Ø Orifice F**	Ø Orifice D**		L8		L9		L10		L11		L12
	Ø Orifice A**	Ø Orifice X** 1)	Ø Orifice F**		.../315		.../315		.../315		.../315		.../315		.../315
	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	-	2.5	-	0.8 1)	0.8 1)	18	30.5	123.5	116.5	147.5	140.5	103.5	96.5	103.5	96.5
25	-	-	0.8 1)	3 2)	1.8 2)	2	14	135	128	159	152	115	108	115	108
32	-	-	1 1)	3 2)	1.8 2)	-	6	127.5	120.5	152.5	145.5	107.5	100.5	107.5	100.5
40	-	-	1.2 1)	3 2)	1.8 2)	-	-	115	108	139	132	95	88	95	88
50	-	-	1.5 1)	3 2)	1.8 2)	-	-	107.5	100.5	129.5	125.5	87.5	80.5	87.5	80.5
63	2 1)	-	1.5 1)	3 1)	1.8 1)	-	-	91.5	84.5	112.5	108.5	71.5	64.5	71.5	64.5

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
R900940864

Control cover for pressure reducing function

general

hydraulic