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BOSCH REXROTH
LFA16DBE-7X/12
R901310833
Directional Seat/Poppet Valves

Logic covers: LFA 16.-7x/

$718.00

BOSCH REXROTH

MATERIAL:  R901310833

SUMMARY:  Logic covers: LFA 16.-7x/

Quantity in stock: 2

Quantity Details:
  • Hydrotech Stock: 0 can ship March 28, 2024
  • Factory Stock: 2 can ship June 27, 2024
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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. .

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-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

Proportional pressure adjustment version

16 to 32

40 to 63

80 and 100

• = available

Proportional valves

DBET-5X/...

without maximum pressure limitation

01

02

03

04

05

LFA

DBE

/

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

Version

03

For set-up of a proportional pressure relief valve without electrical feedback

DBE

Component series

04

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

7X

Seal material

05

NBR seals

no code

FKM seals

V

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

DBET‑5X/.G24‑1 3)

29 165

16 to 32

350

depressurized (up to ≈ 2 bar)

100

DBET‑5X/.G24…

29 165

40

350

100

DBET‑5X/.YG24‑1 3)

upon request

50 to 100

350

100

3) Possible pressure ratings: 50, 100, 200, 315, 350 1 = G 1/4 threaded port T; special cone

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-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

A**

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-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-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/ technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

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

Z12

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/ technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-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

hydraulic

Size

16 25 32 40 50 63

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!

(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.

electrically proportional pressure adjustment

Type LC 16 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 16 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 16 DB.D… (seat-spool valve)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 16 DB.D… (seat-spool valve)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

(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.

electrically proportional pressure adjustment

Type LC 25 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 25 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

(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.

electrically proportional pressure adjustment

Type LC 32 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 32 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

(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.

electrically proportional pressure adjustment

Type LC 40 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 40 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

(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.

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 50 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 50 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

(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.

electrically proportional pressure adjustment

Type LC 63 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

Type LC 63 DB.E… (with seat piston)

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

electrically proportional pressure adjustment

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

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-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

LFA...DBE-7X/ NG 16

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

LFA...DBE-7X/ NG 25, 32, 40

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

LFA...DBE-7X/ NG 50, 63

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

Dimensions in mm

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-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

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

technical illustration-LFA16DBE-7X/12-Logic covers: LFA 16.-7x/

1

Port X optionally as threaded port

2

Port Y optionally as threaded port

3

Locating pin

9

Name plate

11

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

14

Proportional pressure relief valve type DBET-5X/...

15

Pressure relief valve NG 6 (included in scope of delivery)

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

NG

16 25 32 40 50 63

ØD5 1)

M8 M12 M16 M20 M20 M30

ØD6

mm

4 6 8 10 10 12

ØD7H13

mm

4 6 6 6 8 8

H4

mm

20 25 35 45 45 65

L1

mm

65
80
85
-
102
-
125
-
140
-
180
-

L2

mm

46
-
58
-
70
-
85
-
100
-
125
-

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

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.

Mounting screws: Hexagon socket head cap screw according to DIN 912-10.9

Pilot control valve

Type

Dimensions

Tightening torque in Nm

DBET …

M5 x 30

8,9

NG

Ø Orifice B**

Ø Orifice P** 1)

Ø Orifice X** 1)

Ø Orifice F**

Ø Orifice D**

D1

H1

H2

H3

H4

L1

L2

L3

L4

L5

T1

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

16 - 1 0.8 - 0.8 1) G1/4 40 17 15 20 65 80 36.5 23.5 7 12
25 - 1 - 0.8 1) 0.8 2) G1/4 40 19 24 19 85 85 49 36 23.5 12
32 - 1 - 1 1) 0.8 2) G1/4 50 26 28 26 100 100 56.5 43.5 31 12
40 - 1.5 - 1.2 1) 1 2) G1/2 60 30 32 30 125 125 72 53 43.5 14
50 0.8 1) - - 1.5 1) 2 2) G1/2 68 32 34 32 140 140 80 50 51 14
63 0.8 1) - - 2 1) 2.5 2) G1/2 82 30 50 40 180 180 100 80 71 14
1) Orifice Ø, orifice M6 conical
2) Orifice Ø, orifice M8 x 1 conical