Hydrotech Acquires Isaacs
Hydrotech ecommerce supports the continental US only

BOSCH REXROTH
LFA25DBU2A2-7X/100A050/12
R978914412
Directional Seat/Poppet Valves

Logic covers: LFA 25.-7x/

$1,574.00

BOSCH REXROTH

MATERIAL:  R978914412

SUMMARY:  Logic covers: LFA 25.-7x/

Add to Cart

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-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

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

with directional valve

• = available

Position "a"

Position "b"

Position "a"

Position "0"

Position "b"

2 pressure ratings

4WE6H...

DBmax function

open

DB1 function

4WE10H...

4WE6D...

DB1 function

4WE10D...

open

Circulation circuit

blocked

Cartridge valve is hydraulically blocked

DB function

Pressure relief function

01

02

03

04

05

06

07

08

LFA

DBU2A

/

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 2 manual pressure adjustments, electrical selection

de-energized - DB1 (4WE.. D) normally open (4WE.. H)

DBU2A 1)

Adjustment type for pressure adjustment (specification only for DB1)

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

05

Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions)

2)

7X

Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions)

3)

6X

Pressure rating DBmax. (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

Pressure rating DB1 (observe admissible pressure of the pilot control valve)

07

Set pressure up to 25 bar

A025

Set pressure up to 50 bar

A050

Set pressure up to 100 bar

A100

Set pressure up to 200 bar

A200

Set pressure up to 315 bar

A315

Set pressure up to 400 bar

A400

Set pressure up to 420 bar

4)

A420

Seal material

08

NBR seals

no code

FKM seals

V

1) For set-up of a directional spool valve – see switching symbols
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

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]

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**

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

A**

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

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

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/ technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

This orifice is designed as bore. No specifications are made in the type designation. (Orifice Ø in mm)

Z12

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/ technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

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

HETG (rape seed oil)

FKM, NBR

Soluble in water

HEPG (polyglycols)

FKM

VDMA 24568

Other hydraulic fluids on request

For applications outside these parameters, please consult us!

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

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

LFA..DBU2A.-7X... NG 16, 25, 32

4 WE 6 D../...

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

4WE 6 H .. /...

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

LFA..DBU2A.-7X/... NG 40, 50, 63

4 WE 6 D../...

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

LFA...DBU2A.-6X/... NG 80, 100

4 WE 10 D../...

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

4WE 10 H.. /...

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/ technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/ technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

Dimensions in mm

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

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

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

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

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/
1) *) For DBmax, only adjustment type "2" possible

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

10

Lock nut

11

Valve mounting screws M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

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 M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

NG 40, 50

Dimensions in mm

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/
1) *) For DBmax, only adjustment type "2" possible

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

10

Lock nut

11

Valve mounting screws M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

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 M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

NG63

Dimensions in mm

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/
1) *) For DBmax, only adjustment type "2" possible

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

10

Lock nut

11

Valve mounting screws M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

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 M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

NG 80, 100

Dimensions in mm

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/
1) *) For DBmax, only adjustment type "2" possible

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

10

Lock nut

11

Valve mounting screws M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

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 M5 x 90 are included in the scope of delivery of the control cover

12

Plug screw M6 conical at ..DBU 2A..

13

Plug screw M6 conical at ..DBU 2B..

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)

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 P** 1)

Ø Orifice X** 1)

Ø Orifice F** 1)

Ø Orifice D** 1)

H1

H2

H3

H4

H5

L1

L2

L3

L4

L5

L7

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

16 1 0.8 1 0.8 40 17 15 19 28 65 80 36.5 32.5 35 17
25 1 0.8 1 0.8 40 19 24 19 28 85 85 49 45.5 36 27
32 1 1 1.2 1 50 26 28 26 37 100 100 56.5 53 57 34.5
1) Orifice Ø, orifice M6 conical

NG

Ø Orifice P** 1)

Ø Orifice F** 1)

Ø Orifice D** 1)

D1

H1

H2

H3

H4

H5

▢ L1

L3

L4

L5

L7

T1

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

40 1.2 1.2 1 G1/4 60
-
17 32 27 40 125 69 76 68 47 12
50 1.5 1.5 2 G1/2 68
-
19.5 34 35 50 140 80 84 74.5 54.5 14
63 2.5 2 2.5 - 82
-
55 50 45 - 180 - - - - -
1) Orifice Ø, orifice M6 conical

NG

Ø Orifice P** 1)

Ø Orifice X** 2)

Ø Orifice F** 2)

D2

H1

H2

H3

H4

L8

mm

mm

mm

mm

mm

mm

mm

mm

mm

80 3.5 3 2.5 250 100 30 45 52 75
100 3.5 3 2.5 300 100 30 51 52 85
1) Orifice Ø, orifice M8 x 1 conical
2) Orifice Ø, orifice G 1/4 conical

Directional spool valves, direct operated, with solenoid actuation

WE 6...E

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

Directional spool valves, direct operated, with solenoid actuation

WE 6...E

Size 6 Component series 6X Maximum operating pressure 350 bar Maximum flow (DC) 80 l/min Maximum flow (AC) 60 l/min

Data sheet

Configurator / CAD

Spare parts & repair

4/3, 4/2 and 3/2 directional valve with wet-pin DC solenoids

WE 6...E...407

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

4/3, 4/2 and 3/2 directional valve with wet-pin DC solenoids

WE 6...E...407

Size 6 Component series 6X Maximum operating pressure 315 bar Maximum flow 60 l/min

Data sheet

Configurator / CAD

General product information on hydraulic products

Installation, commissioning and maintenance of industrial valves

Spare parts & repair

Directional spool valves, direct operated, with solenoid actuation

WE 6...E...UR

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

Directional spool valves, direct operated, with solenoid actuation

WE 6...E...UR

Solenoid coil is an approved component with UR-marking according to UL 906 Size 6 Component series 6X Maximum operating pressure 350 bar Maximum flow (DC) 80 l/min Maximum flow (AC) 60 l/min

Data sheet

Spare parts & repair

Directional spool valves, direct operated, with solenoid actuation

WE 10...C

technical illustration-LFA25DBU2A2-7X/100A050/12-Logic covers: LFA 25.-7x/

Directional spool valves, direct operated, with solenoid actuation

WE 10...C

Size 10 Component series 3X, 4X Maximum operating pressure 315 bar Maximum flow 120 l/min

Data sheet

Configurator / CAD

Spare parts & repair