LFA50DB1-7X/100/12

Name: LFA50DB1-7X/100/12
Price: 1,595.00 USD
Availability: OutOfStock

Manufacturer: Bosch Rexroth

Material #: R978918212

Model : LFA50DB1-7X/100/12

$1,595.00 USD

More are expected on July 31, 2025

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Status: This product is temporarily out of stock.

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
•	•	•		Without directional valve
• = available

01	02	03	04		05		06	07
LFA		DB		‒		/

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	With manual pressure adjustment	DB
Adjustment type for pressure adjustment
04	Rotary knob	1
	Sleeve with internal hexagon	2
	Lockable rotary knob with scale (H-locking according to automotive standard)	3
	Rotary knob with scale	4
Component series
05	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 1)	7X
05	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 2)	6X
Pressure rating
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 3)	420
Seal material
07	NBR seals	no code
07	FKM seals	V

	1) Component series 7X for sizes 16…63.
	2) Component series 6X for sizes 80 and 100.
	3) 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	●

	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			Mineral oil (HL, HLP) according to DIN 51524, other hydraulic fluids on request
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!

(measured with HLP46, ϑOil = 40 ±5 °C)

The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.

manual pressure adjustment

Type LC 16 DB.E… (with seat piston)

manual pressure adjustment

Type LC 16 DB.E… (with seat piston)

manual pressure adjustment

Type LC 16 DB.D… (seat-spool valve)

manual pressure adjustment

Type LC 16 DB.D… (seat-spool valve)

(measured with HLP46, ϑOil = 40 ±5 °C)

The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.

manual pressure adjustment

Type LC 25 DB.E… (with seat piston)

manual pressure adjustment

Type LC 25 DB.E… (with seat piston)

manual pressure adjustment

Type LC 25 DB.D… (with seat-spool piston)

manual pressure adjustment

Type LC 25 DB.D… (with seat-spool piston)

(measured with HLP46, ϑOil = 40 ±5 °C)

The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.

manual pressure adjustment

Type LC 32 DB.E… (with seat piston)

manual pressure adjustment

Type LC 32 DB.E… (with seat piston)

manual pressure adjustment

Type LC 32 DB.D… (with seat-spool piston)

manual pressure adjustment

Type LC 32 DB.D… (with seat-spool piston)

(measured with HLP46, ϑOil = 40 ±5 °C)

The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.

manual pressure adjustment

Type LC 40 DB.E… (with seat piston)

manual pressure adjustment

Type LC 40 DB.E… (with seat piston)

manual pressure adjustment

Type LC 40 DB.D… (with seat-spool piston)

manual pressure adjustment

Type LC 40 DB.D… (with seat-spool piston)

(measured with HLP46, ϑOil = 40 ±5 °C)

The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.

manual pressure adjustment

Type LC 50 DB.E… (with seat piston)

manual pressure adjustment

Type LC 50 DB.E… (with seat piston)

manual pressure adjustment

Type LC 50 DB.D… (with seat-spool piston)

manual pressure adjustment

Type LC 50 DB.D… (with seat-spool piston)

(measured with HLP46, ϑOil = 40 ±5 °C)

The characteristic curves were measured with external, depressurized pilot oil return. Due to the internal pilot oil return, the inlet pressure increases by the output pressure present in port B.

manual pressure adjustment

Type LC 63 DB.E… (with seat piston)

manual pressure adjustment

Type LC 63 DB.E… (with seat piston)

manual pressure adjustment

Type LC 63 DB.D… (with seat-spool piston)

manual pressure adjustment

Type LC 63 DB.D… (with seat-spool piston)

LFA..DB.-7X/..NG 16, 25, 32

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

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

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 (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

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"
8	Space required to remove the key
9	Name plate
10	Lock nut

1	Port X 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

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

1	Port X 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

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"
8	Space required to remove the key
9	Name plate
10	Lock nut

1	Port X 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

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"
8	Space required to remove the key
9	Name plate
10	Lock nut

1	Port X 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

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	86	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

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 X** 1)	Ø Orifice F** 1)	Ø Orifice D**	H1	H2	H3	H4	L1	L2	L3	L4
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	0.8	1	-	40	17	15	19	65	80	36.5	32.5
25	0.8	1	-	40	19	24	19	85	85	49	45.5
32	-	1.2	0.8 1)	50	26	28	26	100	100	56.5	53

1)	Orifice Ø, orifice M6 conical

Dimensions in mm

NG	Ø Orifice F** 1)	Ø Orifice D** 1)	D1	H1	H2	H3	H4	▢ L1	L2	L3	L4	L5	T1
NG	mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
40	1.2	1	G1/4	60 -	28 -	32	27	125	69	89	76	60	12
50	1.5	2	G1/2	68 -	19.5 -	34	35	140	80	105	84	70	14
63	2	2.5	-	82 -	30 -	50	45.5	180	-	-	-	-	-

1)	Orifice Ø, orifice M6 conical

NG	Ø Orifice X** 1)	Ø Orifice F** 1)	D2	H1	H2	H3	H4	L8
NG	mm	mm	mm	mm	mm	mm	mm	mm
80	3	2.5	250	100	38	45	58	50
100	3	2.5	300	100	38	51	58	50

1)	Orifice Ø, orifice G 1/4 conical

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LFA50DB1-7X/100/12

Manufacturer: Bosch Rexroth

Material #: R978918212

Model : LFA50DB1-7X/100/12

More are expected on July 31, 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

(measured with HLP46, ϑOil = 40 ±5 °C)

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

(measured with HLP46, ϑOil = 40 ±5 °C)

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

(measured with HLP46, ϑOil = 40 ±5 °C)

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

(measured with HLP46, ϑOil = 40 ±5 °C)

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

(measured with HLP46, ϑOil = 40 ±5 °C)

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

(measured with HLP46, ϑOil = 40 ±5 °C)

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

manual pressure adjustment

LFA..DB.-7X/..NG 16, 25, 32

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

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

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

NG 80, 100

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