LFA25H2-7X/FX20/12

Manufacturer: Bosch Rexroth

Material #: R978911445

Model : LFA25H2-7X/FX20/12

***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 LFA25H2-7X/FX20/12 (R978911445) is a highly specialized hydraulic component designed to facilitate a range of pressure, directional, and throttle functions within a compact block design. This way cartridge valve is standardized according to ISO for seamless integration into control blocks, where it is secured with a cover that also serves as the connection point for pilot control valves. The LFA25H2-7X/FX20/12 valve operates by utilizing respective pilot control valves to manage its power section effectively. It offers cost-effective solutions by allowing the size adjustment to match the flow requirements of different actuator paths. The valve assembly comprises a control cover with control bores and may include additional features like stroke limitation, hydraulically controlled directional seat valves, or shuttle valves depending on the overall function needed. Electrically operated directional spool or seat valves can also be accommodated on the control cover. This model includes an installation kit consisting of components such as a bushing, ring (for sizes up to NG), valve poppet—with or without damping nose—and closing spring. The function of this way cartridge valve is pressure-dependent, creating three critical pressurized areas labeled A1, A2, A3. These areas interact to determine the spool position by balancing opening forces against closing forces exerted by area A3 and the spring. The LFA25H2-7X/FX20/12 allows fluid flow from port A to B or vice versa and ensures no leakage when channel A is blocked through pressurization of area A3 with pilot oil. It comes equipped with a remote control port and stroke limitation feature for precise operation. The standard series includes various component series denoted X1, X2, X3 and can withstand maximum operating pressures up to bar while handling maximum flows up to l/min. This way cartridge valve exemplifies Bosch Rexroth's commitment to advanced hydraulic system components tailored for efficient and reliable performance across diverse applications.

$578.00 USD

More are expected on October 14, 2024

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Status: This product is temporarily out of stock.

Qty: Delivered as early as October 14, 2024 when ordered in

This product is eligible for factory repair.

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With remote control port With stroke limitation

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 are realized for the function. A1, A2, A3. 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	08	09
LFA		H2	–		/	F

Type
01	Control cover LFA	LFA
Size
02	NG16	16
	NG25	25
	NG32	32
	NG40	40
	NG50	50
	NG63	63
	NG80	80
	NG100	100
	NG125	125
	NG160	160
Version
03	Control cover with stroke limitation (internal hexagon) and remote control port	H2
Component series
04	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) (NG16 … 63)	7X
	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) (NG80 … 100)	6X
	Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions) (NG125 … 160)	2X
Remote control port
05	With remote control port	F
Nozzle fitting
06	Orifice in channel X 1)	X**
Corrosion resistance
07	None	no code
07	Improved corrosion protection (240 h salt spray test according to EN ISO 9227)	J3
Seal material
08	NBR seals	no code
	FKM seals	V
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
Connections, mounting and plug screws
09	Mounting screws, metric; connections inch thread	no code
09	Mounting screws UNC; connections UNF	/12

1)	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.

Notice:

Up to NG32, control cover "H" can also be combined with pressure logic inserts type LC..DB..7X. From NG40, special covers type LFA...H.../FDR can be used (see cartridge valve type LC "Information").

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	125	160
Weight		kg	1.2	2.3	4	7.4	10.5	21	27	42	80	150
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	125	160
Maximum operating pressure	Without directional valve	bar	420
	Port X 1)	bar	315 350 420
Maximum flow 2)		l/min	25000
Hydraulic fluid			see table "Hydraulic fluid"
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

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: 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!

Type LFA . H…/F

Type LFA . H…/FX**

Size 16 … 40

Dimensions in mm

1	Name plate at NG16, 25, 32
2	Name plate at NG40
3	Port X optionally as threaded port

NG	D1	D2	H1	H2	H3	H5 max	H6 max	▢ L1	L2	L3	T1	SW1 1)	SW2
NG			mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	G 1/8	M6	35	12	15	76	45	65	32.5	4	8	6	21
25	G1/4	M6	40	16	24	80	45	85	42.5	5	12	6	22
32	G1/4	M6	75	16	28	100	-	100	50	5	12	10	27
40	G1/2	M8 x 1	95	30	32	146	-	125	72	5	14	17	46

1)	Internal hexagon

Size 50 … 63

Dimensions in mm

1	Name plate
2	Port X optionally as threaded port

NG	D1	D2	H1	H2	H3	H4 max	▢ L1	L2	L3	T1	SW1 1)	SW2
NG			mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
50	G1/2	M8 x 1	110	32	34	156	140	80	5	14	17	55
63	G3/4	G3/8	125	40	50	175	180	90	5	16	22	65

1)	Internal hexagon

Size 80 ... 160

Dimensions in mm

1	Name plate
2	Port X optionally as threaded port
4	countered

NG	D1	D2	D3	H1	H2	H3	H4	H5	H7 max	L3	T1	SW1	SW2 1)	SW5 1)	SW6 1)
NG	mm			mm	mm	mm	mm	mm	mm	mm	mm		mm	mm	mm
80	250	G3/8	G3/4	114	35	45	76	137	30	3	16	75 mm / -	24 -	5 -	14 -
100	300	G1/2	G1	132	35	52.5	88.5	157	38	3	18	75 mm / -	27 -	5 -	14 -
125	380	G1	G1 1/4	170	50	61	100	195	-	4	20	95 mm / -	27 -	5 -	14 -
160	480	G1	G1 1/4	225	70	74	147	340	-	4	20	- / -	- -	- -	- -

1)	Internal hexagon

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

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.

Connection dimensions according to ISO 7368

Size 16 ... 63

Dimensions in mm

Size 80 ... 100

Dimensions in mm

NG		16	25	32	40	50	63	80	100	125	160
ØD5 1)		M8	M12	M16	M20	M20	M30	M24	M30	-	-
ØD6	mm	4	6	8	10	10	12	16	20	-	-
ØD7H13	mm	4	6	6	6	8	8	10	10	-	-
H4	mm	20	25	35	45	45	65	50	63	-	-
L1	mm	65 80	85 -	102 -	125 -	140 -	180 -	250 -	300 -	- -	- -
L2	mm	46 -	58 -	70 -	85 -	100 -	125 -	200 -	245 -	- -	- -
L3	mm	23	29	35	42.5	50	62.5	-	-	-	-
L4	mm	25	33	41	50	58	75	-	-	-	-
L5	mm	10.5	16	17	23	30	38	-	-	-	-

1)	Mounting thread for version "/12" see data sheet 08936

Size 125

Dimensions in mm

Size 160

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)

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

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)

Additional functions with special numbers (upon request)

Symbol	Type	Size	Description / special characteristic
	LFA…H…/FDR…	40 … 80	Stroke limitation cover for pressure logics
	LFA . H2-14-7X/F	16	Cover for use with piston sealing (type LC…/-004, LC…/-146) Intermediate cover "D19" required
	LFA . H2-18-7X/F	16 ... 63	Stroke limitation with sealing

Orifice selection

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

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

LFA25H2-7X/FX20/12

Manufacturer: Bosch Rexroth

Material #: R978911445

Model : LFA25H2-7X/FX20/12

More are expected on October 14, 2024

This product is eligible for factory repair.

general

hydraulic

Type LFA . H…/F

Type LFA . H…/FX**

Size 16 … 40

Size 50 … 63

Size 80 ... 160

Mounting screws (included in scope of delivery)

Connection dimensions according to ISO 7368

Size 16 ... 63

Size 80 ... 100

Size 125

Size 160

Orifice symbol

Additional functions with special numbers (upon request)

Orifice selection

Orifice selection

Orifices

Plug screws

Related Products

Information

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