LFA40DBWD2-7X/100/12

Manufacturer: Bosch Rexroth

Material #: R901165815

Model : LFA40DBWD2-7X/100/12

***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 LFA40DBWD2-7X/100/12 (R901165815) is a sophisticated way cartridge valve designed for pressure functions, including pressure relief and pressure reducing capabilities. This pilot-operated valve can be configured as either a seat or spool design, with the power section installed into a standardized receiving hole according to DIN ISO specifications and sealed with a control cover. The valve features an integrated pilot control valve for manual or electrically proportional pressure adjustment. This pilot control valve is either incorporated into the control cover or mounted on it, adhering to DIN mounting dimensions. The versatility of this system allows for various pressure functions to be achieved by combining different cartridge valves and control covers. For the pressure relief function, the LFA40DBWD2-7X/100/12 operates as a seat valve without an area difference at port B. The effective pressure at port A is regulated through the pilot oil supply orifice to the spring side of the element, ensuring that the spool remains closed under spring force until the set pressure is reached. At this point, the spool opens to limit the pressure at port A according to its characteristic curve. In terms of its pressure reducing function, this model acts as a spool valve with no effective areas at port B and remains open in its rest position. Like in the relief function, identical cover types are utilized for pilot control. The spool is held open by spring force allowing free flow from port B to port A until reaching the set performance limit and pressure; then it closes to reduce the outlet pressure accordingly. The LFA40DBWD2-7X/100/12 is part of component series X and can handle maximum operating pressures up to bar. It offers various configurations such as manual adjustment options, directional valves integrations, blocking functions for different positions (a and b), circulation circuit controls, and hydraulic blocking capabilities for specific DB functions. This makes it suitable for a wide range of applications where precise hydraulic flow and pressure management are required.

$1,447.00 USD

More are expected on April 24, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 24, 2025 when ordered in

This product is eligible for factory repair.

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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 relief function

The cartridge valve (1) for the pressure relief function (type LC . DB...) is designed as seat valve without area difference (no effective area at port B). The effective pressure at port A is directed via the pilot oil supply orifice (5) to the spring side (6) of the element. Under the pressure set at the pilot control valve (4), the spool (3) is pressure-compensated and closed by the spring force.

On reaching the set pressure, the spool (3) is opened and the pressure at port A is limited according to the pressure-flow characteristics.

Pressure reducing function

Rest position open

The cartridge valve for the pressure reducing function is designed as spool valve without area difference (no effective areas at port B).

As pilot control valve, identical cover types as for the pressure relief function are applied (type LFA..DB...).

The effective pressure at port A is directed via the pilot oil supply orifice to the spring side of the spool. Under the performance limit and the pressure set at the pilot control valve, the spool is pressure-compensated and retained in open position by the spring force to enable free flow from port B to port A.

On reaching the set pressure, the spool is closed and the pressure at port A is reduced according to the pressure-flow characteristics.

	Size			Pilot control valve	manual pressure adjustment
	16 to 32	40 to 63	80 and 100	Pilot control valve	manual pressure adjustment
	•	•	•		with directional valve
• = available					Position "a"	Position "b"
• = available					Position "a"	Position "0"	Position "b"
Blocking function	•	•		3WE6B9-...	DB function	blocked
			•	3WE10B9-...	DB function	blocked
	•	•		3WE6A-...	blocked	DB function
	•	•		4WE6M..			open
			•	3WE10A...
			•	4WE10M...			open

open	Circulation circuit
blocked	Cartridge valve is hydraulically blocked
DB function	Pressure relief function

01	02	03	04		05		06	07
LFA		DBWD		‒		/

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	With manual pressure adjustment, for electric unloading circuit	DBWD 1)
Adjustment type for pressure adjustment
04	Rotary knob	1
	Sleeve with hexagon and protective cap	2
	Lockable rotary knob with scale (H-locking according to automotive standard)	3
	Rotary knob with scale	4
Component series
Component series
05	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 2)	7X
05	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 3)	6X
Pressure rating (observe admissible pressure of the pilot control valve)
06	Set pressure up to 25 bar	025
	Set pressure up to 50 bar	050
	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 400 bar	400
	Set pressure up to 420 bar 4)	420
Seal material
07	NBR seals	no code
07	FKM seals	V

	1) For set-up of a directional spool valve
	2) Component series 7X for sizes 16…63.
	3) Component series 6X for sizes 80 and 100.
	4) NG 16 ... 32 only

General information on the ordering codes for control covers: Pilot control valves (maximum operating pressure)

Pilot control valve		Control cover	Maximum operating pressure in bar Y, T			included in type	separate order
Type	Catalog sheet no.	NG	Maximum operating pressure in bar Y, T
Type	Catalog sheet no.	NG	X	at pressure control	static
DBD. 2 K2X/… 1)	upon request	16 to 32	420	depressurized (up to ≈ 2 bar)	315	●
DBD. 6 K1X/… 2)	25 402	40 to 63	400		315	●
DBD. 10 K1X/… 2)	25 402	80, 100	400		315	●
.WE 6 …	23 178	16 to 63	350		[si]210 (=); 160 (~)[/si][/imp]3050 (=); 2300 (~)[/imp]		●
.WE 10 …	23 327	80, 100	315		[si]210 (=); 160 (~)[/si][/imp]3050 (=); 2300 (~)[/imp]		●

	1) Possible pressure ratings: 25, 50, 100, 200, 315, 420
	2) Possible pressure ratings: 25, 50, 100, 200, 315, 400

Notice:

By combination of a 2-way cartridge valve with a pilot control valve, various valve functions can be realized.

In particular, the following devices come into question in porting pattern form A6 (up to NG 63) and form A10 (NG 80 to 100) DIN 24 340.

Valve mounting screws are included in the scope of delivery of the control cover.

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)

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

general

Size	16	25	32	40	50	63	80	100

hydraulic

Size			16	25	32	40	50	63	80	100
Maximum operating pressure 1)		bar	420
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 2)			Class 20/18/15 according to ISO 4406 (c)

1)	Attention: Observe pmax of the pilot control valves!
2)	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

For applications outside these parameters, please consult us!

3 WE 6 A../...

4 WE 6 M../...

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

3 WE 6 B9-../...

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

3 WE 6 B9-../...

LFA..DBWD.-7X/...NG 40, 50, 63

3 WE 6 B9-../...

3 WE 10 A...

4 WE 10 M...

LFA..DBWD.-6X/... NG 80, 100

3 WE 10 B9...

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

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)

NG 80, 100

Dimensions in mm

5	Bore for locating pin (cover pin assembled according to DIN 24 342)

Mounting screws: Hexagon socket head cap screw according to DIN 912-10.9
Pilot control valve Type	Dimensions	Tightening torque in Nm

.WE 6 …	M5 x 50	8,9
.WE 10 …	M6 x 40	15,5

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
80	8	M 24 x 120	900
100	8	M 30 x 120	1800

Thread dimensions of orifice
D orifices at type ..DBE.. NG 25 to 63		M8 x 1 conical
Orifices for NG 80, 100		M8 x 1 conical (A, B, P, D) or G 1/4 (X, F)
other installed orifices		M6 conical

NG 16, 25, 32

Dimensions in mm

NG 40, 50

Dimensions in mm

1	Port X optionally as threaded port
2	Port Y optionally as threaded port
3	Locating pin
4	Adjustment type "2"
5	Adjustment type "1"
6	Adjustment type "3"
7	Adjustment type "4"
9	Name plate
11	Valve mounting screws are included in the scope of delivery of the control cover

1	Port X optionally as threaded port
2	Port Y optionally as threaded port
3	Locating pin
4	Adjustment type "2"
5	Adjustment type "1"
6	Adjustment type "3"
7	Adjustment type "4"
8	Space required to remove the key
9	Name plate
10	Lock nut
11	Valve mounting screws are included in the scope of delivery of the control cover

NG63

Dimensions in mm

NG 80, 100

Dimensions in mm

1	Port X optionally as threaded port
2	Port Y optionally as threaded port
3	Locating pin
4	Adjustment type "2"
5	Adjustment type "1"
6	Adjustment type "3"
7	Adjustment type "4"
9	Name plate
11	Valve mounting screws are included in the scope of delivery of the control cover

1	Port X optionally as threaded port
2	Port Y optionally as threaded port
3	Locating pin
4	Adjustment type "2"
5	Adjustment type "1"
6	Adjustment type "3"
7	Adjustment type "4"
8	Space required to remove the key
9	Name plate
10	Lock nut
11	Valve mounting screws are included in the scope of delivery of the control cover

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
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	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.

NG	Ø Orifice B** 1)	Ø Orifice X** 1)	Ø Orifice F** 1)	H1	H2	H3	H4	H5	L2	L3	L4	L5	L7
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	1	0.8	1	40	- -	15	19	28	80	-	32.5	35	17
25	1	0.8	1	40	19 -	24	19	28	85	49	45.5	36	27
32	1	1	1.2	50	26 -	28	26	37	100	56.5	53	57	34.5

1)	Orifice Ø, orifice M6 conical

NG	Ø Orifice B** 1)	Ø Orifice F** 1)	Ø Orifice D** 1)	D1	H1	H2	H3	H4	H5	▢ L1	L3	L4	L5	L7	T1
NG	mm	mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
40	1.2	1.2	1	G1/4	60	46	32	27	16	125	62.5	76	68	47	12
50	1.5	1.5	2	G1/2	68	50	34	35	20	140	70	84	75	54.5	14

1)	Orifice Ø, orifice M6 conical

NG	Ø Orifice B** 1)	Ø Orifice F** 1)	Ø Orifice D** 1)	H1	H2	H3	H4	▢ L1
NG	mm	mm	mm	mm	mm	mm	mm	mm
63	1.8	2	2.5	82	55	50	45	180

1)	Orifice Ø, orifice M6 conical

NG	Ø Orifice B** 1)	Ø Orifice X** 2)	Ø Orifice F** 2)	D2	H1	H2	H3	H4	L8
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm
80	3.5	3	2.5	250	100	67	45	58	75
100	3.5	3	2.5	300	100	67	51	58	85

1)	Orifice Ø, orifice M8 x 1 conical
2)	Orifice Ø, orifice G 1/4 conical

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Configurator / CAD

General product information on hydraulic products

Installation, commissioning and maintenance of industrial valves

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Spare parts & repair

LFA40DBWD2-7X/100/12

Manufacturer: Bosch Rexroth

Material #: R901165815

Model : LFA40DBWD2-7X/100/12

More are expected on April 24, 2025

This product is eligible for factory repair.

General information on the ordering codes for control covers: Pilot control valves (maximum operating pressure)

general

hydraulic

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

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

LFA..DBWD.-7X/...NG 40, 50, 63

LFA..DBWD.-6X/... NG 80, 100

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

NG 80, 100

NG 16, 25, 32

NG 40, 50

NG63

NG 80, 100

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