Hydrotech Acquires Isaacs
Hydrotech ecommerce supports the continental US only

BOSCH REXROTH
LFA25DREV-7X/006
R900945630
Directional Seat/Poppet Valves

Logic covers: LFA 25.-7x/

$2,099.00

BOSCH REXROTH

MATERIAL:  R900945630

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-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

Pressure reducing function

Rest position closed

For the pressure reducing function with opening characteristic, a pressure limitation cartridge valve (type LC..DB40D...) and a control cover with a pressure reducing pilot control valve (type LFA..DR...) are applied. The pilot oil is directed from port A via the supply orifice and the opened pilot control valve to side B.

The main spool is opened and the flow from port A to port B is released.

On reaching the set pressure, the spool is closed and the pressure at port B is reduced according to the pressure-flow characteristics. Potential pressure increases on the secondary side are discharged to the tank via the 3rd way of the pilot control valve. Set-up of a directional valve enables realization of an additional blocking function (type LFA..DRW...).

Control cover for pressure reducing function

01

02

03

04

05

06

LFA

DREV

7X

/

006

Type

01

Control cover LFA

LFA

Size

02

NG 25

25

NG 32

63

NG 40

40

NG 50

50

NG 63

63

Version

03

Pressure reducing function - Main spool in rest position closed (LC..DB 40 D..- separate order)

DREV

Component series

04

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

7X

Pressure rating (pressure reducing valve)

05

Set pressure up to 7 bar

006

Seal material

06

NBR seals

no code

FKM seals

V

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

Main spool in rest position closed - LC..DB 40 D..- separate order

Orifice symbol

Symbol in ordering code

A**

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

A**

technical illustration-LFA25DREV-7X/006-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-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/ technical illustration-LFA25DREV-7X/006-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-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/ technical illustration-LFA25DREV-7X/006-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)

general

Size

25 32 40 50 63

hydraulic

Size

25 32 40 50 63

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 1)

Class 20/18/15 according to ISO 4406 (c)
1) 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

Control cover

Size

25 32 40 50 63

maximum admissible operating pressure in port ...

...X (primary pressure)

bar

350

...Y (secondary pressure = max. set pressure)

bar

350

...Z2

static

bar

315

at pressure control

depressurized (up to ≈ 2 bar)

...T

static 1)

bar

100

at pressure control

depressurized (up to ≈ 2 bar)
1) according to the admissible tank pressure of the pilot control valves

For applications outside these parameters, please consult us!

Attention!

Control covers type LFA..DR... are combined with 2-way cartridge valves type LC..DB 40 D... (see ordering code).

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-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

(basic symbol) - Pressure reducing function

LFA..DREV-7X/006 NG 25, 32

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

LFA..DREV-7X/006 NG 40, 50

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

LFA..DREV-7X/006 NG 63

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/ technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

Dimensions in mm

technical illustration-LFA25DREV-7X/006-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)

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

NG 16, 25, 32

Dimensions in mm

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

1

Port X optionally as threaded port (at NG 16...50)

3.1

Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63)

4

Locating pin

9.1

Name plate (NG16)

9.2

Name plate (NG 25, 32)

NG 40, 50

Dimensions in mm

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

1

Port X optionally as threaded port (at NG 16...50)

2

Port Y optionally as threaded port (at NG 40, 50)

3.1

Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63)

3.2

Port Z2 optionally as threaded port (at NG 40, 50, 63)

4

Locating pin

9.3

Name plate (NG 40, 50, 63)

10

Check valve (at NG 63 orifice F in poppet)

NG63

Dimensions in mm

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/

3.1

Port Z1 optionally as threaded port (at LFA..DREZ.. , LFA..DREWZ..., NG 25..63)

3.2

Port Z2 optionally as threaded port (at NG 40, 50, 63)

4

Locating pin

9.3

Name plate (NG 40, 50, 63)

10

Check valve (at NG 63 orifice F in poppet)

11

At control cover NG 63, logic element NG 16

NG 25 to 63

Dimensions in mm

technical illustration-LFA25DREV-7X/006-Logic covers: LFA 25.-7x/
1) Pressure ratings for valve type:
DBET-5X/... [si]50, 100, 200, 315 and 350 bar[/si][imp]725, 1450, 2900, 4550 and 5100 psi[/imp]
2) 1 = G 1/4 threaded port T; special cone

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

NG

H1

H2

H3

L1

L2

L3

L7

mm

mm

mm

mm

mm

mm

mm

25 40
-
19
-
24 85
-
85 49 59
32 50
-
26
-
28 100
-
100 56.5 66.5

NG

Ø Orifice A**

Ø Orifice F** 1)

Ø Orifice D**

L1

L2

L8

L9

mm

mm

mm

mm

mm

mm

mm

25 - 0.8 1.5 2) 85 85 15 42
32 - 1 1.5 2) 100 100 7.5 35
40 - 1.2 1.8 2) 125 125 - 22
50 - 1.5 1.8 2) 140 140 - 15
63 2 1) 1.5 1.8 1) 180 180 - -
1) Orifice Ø, orifice M6 conical
2) Orifice Ø, orifice M8 x 1 conical

NG

H1

H2

H3

H4

H5

L1

L2

L3

L4

L5

L7

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

40 60
-
30
-
32 40 40 125
-
125 72 62.5 62.5 79
50 68
-
32
-
34 32 32 140
-
140 80 70 70 86.5