LFA25WEMB-7X/P12

Manufacturer: Bosch Rexroth

Material #: R900975749

Model : LFA25WEMB-7X/P12

***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 LFA25WEMB-7X/P12 (R900975749) is a sophisticated way cartridge valve designed for seamless integration into compact block systems. This valve is engineered to accommodate various hydraulic functions including pressure, directional, and throttle controls, or a combination of these, by being paired with the appropriate pilot control valves. Its versatility makes it an ideal solution for applications requiring efficient and cost-effective multiple function elements. The model features a standardized receiving hole for the power section with connections A and B as per ISO norms, which is then sealed with a cover that also serves as the conduit to the pilot control valves. The LFA25WEMB-7X/P12 consists of a control cover that houses control bores and may include additional functionalities such as stroke limitation, hydraulically controlled directional seat valves, or shuttle valves depending on the overall function needed. Moreover, it's possible to fit electrically operated directional spool or seat valves onto the control cover. A unique aspect of this valve is its pressure-dependent operation which creates three distinct pressurized areas (A1, A2, A3) essential for its functionality. The valve's design allows for different area ratios (A1 : A2) leading to varied annulus areas (A2), which in turn affect the flow and pressure characteristics. The direction in which the valve operates—either from A to B or vice versa—is determined by the balance of forces acting upon these areas combined with spring action. The Bosch Rexroth LFA25WEMB-7X/P12 can be customized with different area ratios, springs, and cracking pressures to meet specific requirements. It is built to withstand a maximum operating pressure up to a certain bar level and can handle maximum flow rates measured in liters per minute (l/min), making it suitable for a wide range of hydraulic applications where precision and reliability are paramount.

$533.00 USD

More are expected on October 7, 2024

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Status: This product is temporarily out of stock.

Qty: Delivered as early as October 7, 2024 when ordered in

This product is eligible for factory repair.

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2 area ratios 4 different springs 6 different cracking pressures

2-way cartridge valves are elements that have been designed for a compact block design. The power section with connections A and B is installed into the control block in a receiving hole standardized according to ISO 7368 and closed with a cover. In most cases, the cover is also the connection from the control side of the power section to the pilot control valves.

By control with respective pilot control valves, the power section can be applied for pressure, directional and throttle functions or a combination of these functions. Particularly efficient solutions are realized by adjustment of the size to various flows of the individual ways of an actuator. The application of power sections of elements for multiple functions is very cost-effective.

2-way cartridge valves generally consist of control cover (1) and installation kit (2). The control cover contains the control bores and optionally a stroke limitation function, a hydraulically controlled directional seat valve or a shuttle valve according to the required overall function. Additionally, electrically operated directional spool or seat valves can be installed at a control cover. The installation kit consists of a bushing (3), ring (4) (only up to NG32), valve poppet (5), optionally with damping nose (6) or without damping nose (7) as well as closing spring (8).

The function of 2-way cartridge valves is pressure-dependent. This way, three crucial pressurized areas A1, A2, A3 are realized for the function. The area at valve seat A1 is observed as 100 %. Depending on the version, the annulus area A2 realized by grading is 7 % or 50 % of area A1. The area ratio A1 : A2 is respectively either 14.3 : 1 or 2 : 1. The area A3 is identical to the sum of areas A1 + A2. Due to the different area ratios A1 : A2 and the resulting different annulus areas (A2), the area A3 is one time 107 % and another time 150 % of the area A1 at the seat, which is observed as 100 %.

In general, the following applies:

The areas A1 and A2 are effective in opening direction. The area A3 and the spring are effective in closing direction. The direction of action of the resulting force from the opening and closing forces determines the spool position of the 2-way cartridge valve.

The 2-way cartridge valves can be passed from A to B or from B to A. Pressurization of area A3 by pilot oil discharge from channel B or external pilot oil supply, channel A is blocked without leakage.

01	02	03		04		05	06	07
LFA		WEMB	–		/

Type
01	Control cover LFA	LFA
Size
02	NG 16	16
	NG 25	25
	NG 32	32
	NG 40	40
	NG 50	50
	NG 63	63
	NG 80	80
	NG 100	100
Version
03	Control cover version "WEMB": For set-up of a directional valve	WEMB
Component series
04	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 1)	7X
04	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 2)	6X
Nozzle fitting
05	Orifice in channel P 3)	P..
06	Orifice in channel T 3)	T..
07	Orifice in channel F 3)	F..

	1) Component series 7X for sizes 16...63
	2) Component series 6X for sizes 80 and 100
	3) 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: P12 = Orifice with Ø1.2 mm in channel P. Additional orifice Ø see diagrams/characteristic curves.

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)

Notices:

For ordering code of orifices, see "Accessories" Additional functions with special numbers see "Information".

general

Size			16	25	32	40	50	63	80	100
Weight		kg	1.2	2.3	4	7.4	10.5	21	27	42
Ambient temperature range	NBR seals	°C	-30 … +60
Ambient temperature range	FKM seals	°C	-20 … +60
MTTFD values according to EN ISO 13849 1)		Years	150

1)	For further details, see data sheet 08012

hydraulic

Size			16	25	32	40	50	63	80	100
Maximum operating pressure	Port X 1)	bar	315 350 420
	Port Z1 1)	bar	315 350 420
	Port Z2 1)	bar	315 350 420
	Port Y		depending on the maximum tank pressure of the attached directional valve
Maximum flow 2)		l/min	25000
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
	FKM seals	°C	-20 … +80
Viscosity range		mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 3)			Class 20/18/15 according to ISO 4406 (c)

1)	dependent on the attached directional valve
2)	NG-dependent; see characteristic curves
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.

Hydraulic fluid		Classification	Suitable sealing materials	Standards	Data sheet
Mineral oils		HL, HLP, HLPD, HVLP, HVLPD	NBR, FKM	DIN 51524	90220
Bio-degradable 1)	Insoluble in water	HETG	NBR, FKM	ISO 15380	90221
		HEES	FKM
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Water-free	HFDU (glycol base)	FKM	ISO 12922	90222
		HFDU (ester base) 1)	FKM
	Containing water 1)	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)	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.). Flame-resistant - containing water: Life cycle as compared to operation with mineral oil HL, HLP 30 … 100%. Maximum hydraulic fluid temperature 60 °C Bio-degradable and flame-resistant – containing water: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.

1)	Not recommended for corrosion-protected version "J3" (contains zinc)

Hydraulic fluid		Classification	Suitable sealing materials	Standards	Data sheet
Mineral oils		HL, HLP, HLPD, HVLP, HVLPD	NBR, FKM	DIN 51524	90220
Bio-degradable 1)	Insoluble in water	HETG	FKM	ISO 15380	90221
		HEES	FKM
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Water-free	HFDU (glycol base)	FKM	ISO 12922	90222
		HFDU (ester base) 1)	FKM
	Containing water 1)	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922	90223
Important information on hydraulic fluids: For further information and data on the use of other hydraulic fluids, 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.). Flame-resistant – containing water: Life cycle as compared to operation with mineral oil HL, HLP 30 … 100% Maximum hydraulic fluid temperature 60 °C Bio-degradable and flame-resistant: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.

1)	Not recommended for corrosion-protected version "J3" (contains zinc)

For applications outside these parameters, please consult us!

Orifices

Orifice Ø in mm	Order numbers	Material numbers
Orifice Ø in mm	Order numbers	M6 conical	M8 x 1 conical	G 1/8 conical	G 1/4 conical	G 3/8 conical	G 1/2 conical	G 1 conical
–	00	–	–	–	–	–	–	–
0,5	05	R913040356	R913017600	R913030187	R913040456	–	–	–
0,6	06	R913040358	R913017605	R913017606	R913020197	–	–	–
0,7	07	R913040360	R913017609	R913046092	–	–	–	–
0,8	08	R913029447	R913017614	R913017616	R913017615	R913040481	R913040499	–
1,0	10	R913019186	R913017621	R913024679	R913017622	R913040484	R913040500	–
1,2	12	R913040362	R913017627	R913017629	R913017628	R913040486	R913040501	–
1,5	15	R913028337	R913017637	R913017639	R913017638	R913040488	R913028317	–
1,8	18	R913030186	R913017644	R913017646	R913017645	R913040489	R913045913	–
2,0	20	R913029870	R913017651	R913040450	R913017652	R913028417	R913028336	–
2,5	25	R913032543	R913035796	R913017656	R913019582	R913040493	R913040502	–
3,0	30	R913040368	R913017661	R913017663	R913017662	R913018266	R913040503	R913040467
3,5	35	–	R913017667	R913040452	R913040463	R913028318	R913019856	R913040469
4,0	40	–	R913017670	R913027078	R913040464	R913018265	R913029168	R913040470
4,5	45	–	R913046571	R913017671	R913040465	–	R913040506	–
5,0	50	–	–	R913017673	R913040468	R913023871	R913019857	R913040471
5,5	55	–	–	R913027077	–	R913040495	R913053659	–
6,0	60	–	–	–	–	R913023870	R913028418	R913020247
7,0	70	–	–	–	R913040461	R913017675	R913040509	–
7,5	75	–	–	–	–	R913023430	–	R913018328
8,0	80	–	–	–	–	R913046570	R913040510	R913020246
closed	99	R913019128	R913019129	R913019137	R913019136	R913019138	–	R913019140

Other orifices upon request.

Plug screws
Thread	Tightening torque MA in Nm ±10 %
G 1/8	12
G 1/4	30
G 3/8	55
G 1/2	80
G 3/4	135
G 1	225
G 1 1/4	360

LFA . WEMB… (NG16 … 32)

LFA . WEMB… (NG 40 ... 100)

Control cover "WEMB" for set-up of a directional valve: NG16 ... 50

Dimensions in mm

1	Name plate at NG16, 25, 32
2	Name plate at NG40 and 50
3	Ports X, Y, Z1 and Z2 optionally as threaded ports at NG40 and 50
4	Plug screw M6 at type WEMB
5	Plug screw M6 at type WEMA
6	Directional spool valve type 4WE 6 D… (pilot control valve), separate order
7	Directional seat valve type M-3SEW 6 … (pilot control valve), separate order
8	Porting pattern according to ISO 4401-03-02-0-05 (mounting thread for version "/12" see data sheet 08936)

NG	D1	H1	H2	H3	H4	L1	L2	L3	L4	L5	L6	L7
NG		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	-	40	- -	15	-	65	80	-	17	47.5	-	-
25	-	40	- -	24	-	85	85	-	27	64	-	-
32	-	50	- -	28	-	100	100	-	34.5	71.5	-	-
40	G1/2	60	30 -	32	30	125	125	53	47	84	72	72
50	G1/2	68	32 -	34	32	140	140	60	54.5	91.5	80	80

Control cover "WEMB" for set-up of a directional valve: NG63

Dimensions in mm

1	Name plate
2	Ports X, Y, Z1 and Z2 optionally as threaded ports
3	Plug screw M8 x 1 at type WEMB
4	Plug screw M8 x 1 at type WEMA
5	Directional spool valve type 4WE 10 D… (pilot control valve), separate order
6	Directional seat valve type M-3SEW 10 … (pilot control valve), separate order
7	Porting pattern according to ISO 4401-05-04-0-05 (mounting thread for version "/12" see data sheet 08936)

Control cover "WEMB" for set-up of a directional valve: NG80 ... 100

Dimensions in mm

1	Name plate
2	Ports X, Y, Z1 and Z2 optionally as threaded ports
3	Plug screw M8 x 1 at type WEMB
4	Plug screw M8 x 1 at type WEMA
5	Directional spool valve type 4WE 10 D… (pilot control valve), separate order
6	Directional seat valve type M-3SEW 10 … (pilot control valve), separate order
7	Porting pattern according to ISO 4401-05-04-0-05 (mounting thread for version "/12" see data sheet 08936)

NG	D1	D2	H1	H2	H3	H4	L3	L4	L5	L6
NG	mm		mm	mm	mm	mm	mm	mm	mm	mm
80	250	M8 x 1	80	42	45	26	10	10	16	27
100	300	G1/8	100	55	52.5	35	13	9.5	27	26

LFA control cover mounting screws
Hexagon socket head cap screws ISO 4762 - 10.9-flZn/nc/480h/C 1)
Size	Quantity	Tightening torque MA in Nm ±10 %
16	4	30
25	4	100
32	4	240
40	4	480
50	4	480
63	4	1600
80	8	800
100	8	1600

	1) Hexagon socket head cap screws UNC, see data sheet 08936

Mounting screws included in the scope of delivery.

Notice:

The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %). The specified tightening torques were calculated with total friction coefficient μ = 0.09 … 0.14; adjust in case of modified surfaces. Supplied mounting screws are only suitable for direct assembly on a block. If an intermediate cover is used, mounting screws have to be designed accordingly longer (see dimensions).

Installation bore and connection dimensions according to ISO 7368

Size 16 ... 63

Dimensions in mm

1	Bore for locating pin
2	80 mm only at control cover for directional valve set-up NG16 (axis X–Y bore)

Size 80 ... 100

Dimensions in mm

1	Bore for locating pin

NG	ØD1H7	ØD2	ØD3/(ØD3*) 1)	ØD4H7	ØD5 2)	ØD6	ØD7H13	H1	H2		H3		H4	H5	H6	H7	H8	H9	L1	L2	L3	L4	L5	W	Ro 3)	Ru 3)
NG	mm	mm	mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	32	16	16 25	25	M8	4	4	42.5	56	+ 0.1	43	+ 0.2	20	11	2	20	2	0.5	65 80	46	23	25	10.5	0.05	2	1
25	45	25	25 32	34	M12	6	6	57	72	+ 0.1	58	+ 0.2	25	12	2.5	30	2.5	1	85	58	29	33	16	0.05	2	1
32	60	32	32 40	45	M16	8	6	68.5	85	+ 0.1	70	+ 0.2	35	13	2.5	30	2.5	1.5	102	70	35	41	17	0.1	2	1
40	75	40	40 50	55	M20	10	6	84.5	105	+ 0.1	87	+ 0.3	45	15	3	30	3	2.5	125	85	42.5	50	23	0.1	4	1
50	90	50	50 63	68	M20	10	8	97.5	122	+ 0.1	100	+ 0.3	45	17	3	35	4	2.5	140	100	50	58	30	0.1	4	1
63	120	63	63 80	90	M30	12	8	127	155	+ 0.1	130	+ 0.3	65	20	4	40	4	3	180	125	62.5	75	38	0.1	4	1
80	145	80	80 100	110	M24	16	10	170.5	205	+ 0.1	175	+ 0.4	50	25	5	40	5	4.5	250	200	-	-	-	0.1	4	1
100	180	100	100 125	135	M30	20	10	205.5	245	+ 0.1	210	+ 0.4	63	29	5	50	5	4.5	300	245	-	-	-	0.1	4	1

1)	Due to the use of a bore with ØD3, port B protrudes over the upper limit of the area intended in ISO 7368. This is, however, possible due to the sealing concept and reduces the pressure loss during flow through the valve. Thus, we recommend a bore with ØD3.
2)	Mounting thread for version "/12" see data sheet 08936
3)	Maximum dimension

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Notices:

The specified tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10%). The specified tightening torques were calculated with total friction coefficient μtotal = 0.09 ... 0.14; adjust in case of modified surfaces. Supplied mounting screws are only suitable for direct assembly on a block. If an intermediate cover is used, mounting screws have to be designed accordingly longer.

Mounting screws (included in scope of delivery)

Hexagon socket head cap screws ISO 4762 - 10.9-flZn/nc/480h/C 1)
Size	Quantity	Tightening torque MA in Nm ±10 %
16	4	30
25	4	100
32	4	240
40	4	480
50	4	480
63	4	1600
80	8	800
100	8	1600
125	8	3100
160	12	5000

1)	Hexagon socket head cap screws UNC, see data sheet 08936

Additional functions with special numbers (upon request)

Orifice symbol

Orifice symbol	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)

LFA25WEMB-7X/P12

Manufacturer: Bosch Rexroth

Material #: R900975749

Model : LFA25WEMB-7X/P12

More are expected on October 7, 2024

This product is eligible for factory repair.

general

hydraulic

Orifices

LFA . WEMB… (NG16 … 32)

LFA . WEMB… (NG 40 ... 100)

Control cover "WEMB" for set-up of a directional valve: NG16 ... 50

Control cover "WEMB" for set-up of a directional valve: NG63

Control cover "WEMB" for set-up of a directional valve: NG80 ... 100

Installation bore and connection dimensions according to ISO 7368

Size 16 ... 63

Size 80 ... 100

Mounting screws (included in scope of delivery)

Additional functions with special numbers (upon request)

Orifice symbol

Orifice selection

Related Products

Information

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