2-WAY CARTRIDGE VALVES, DIRECTIONAL FUNCTIONS

LFA..WEA

Material #: R900929841

Model : LFA32WEA-7X/A12P12

2 area ratios 4 different springs 6 different cracking pressures

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2 area ratios 4 different springs 6 different cracking pressures

2-way cartridge valves are elements that have been designed for a compact block design. The power section with connections A and B is installed into the control block in a receiving hole standardized according to ISO 7368 and closed with a cover. In most cases, the cover is also the connection from the control side of the power section to the pilot control valves.

By control with respective pilot control valves, the power section can be applied for pressure, directional and throttle functions or a combination of these functions. Particularly efficient solutions are realized by adjustment of the size to various flows of the individual ways of an actuator. The application of power sections of elements for multiple functions is very cost-effective.

2-way cartridge valves generally consist of control cover (1) and installation kit (2). The control cover contains the control bores and optionally a stroke limitation function, a hydraulically controlled directional seat valve or a shuttle valve according to the required overall function. Additionally, electrically operated directional spool or seat valves can be installed at a control cover. The installation kit consists of a bushing (3), ring (4) (only up to NG32), valve poppet (5), optionally with damping nose (6) or without damping nose (7) as well as closing spring (8).

The function of 2-way cartridge valves is pressure-dependent. This way, three crucial pressurized areas A1, A2, A3 are realized for the function. The area at valve seat A1 is observed as 100 %. Depending on the version, the annulus area A2 realized by grading is 7 % or 50 % of area A1. The area ratio A1 : A2 is respectively either 14.3 : 1 or 2 : 1. The area A3 is identical to the sum of areas A1 + A2. Due to the different area ratios A1 : A2 and the resulting different annulus areas (A2), the area A3 is one time 107 % and another time 150 % of the area A1 at the seat, which is observed as 100 %.

In general, the following applies:

The areas A1 and A2 are effective in opening direction. The area A3 and the spring are effective in closing direction. The direction of action of the resulting force from the opening and closing forces determines the spool position of the 2-way cartridge valve.

The 2-way cartridge valves can be passed from A to B or from B to A. Pressurization of area A3 by pilot oil discharge from channel B or external pilot oil supply, channel A is blocked without leakage.

01

02

03

04

05

06

07

LFA

WEA

/

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

NG 125

125

NG 160

160

Version

03

Control cover version "WEA": For set-up of a directional valve

WEA

Component series

04

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

1)

7X

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

2)

6X

Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions)

3)

2X

Nozzle fitting

05

Orifice in channel A

4)

A..

06

Orifice in channel P

4)

P..

07

Orifice in channel T

4)

T..

1) Component series 7X for sizes 16...63
2) Component series 6X for sizes 80 and 100
3) Component series 2X for sizes 125 and 160
4) 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. Additional orifice Ø see diagrams/characteristic curves.

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)

Notices:

For ordering code of orifices, see "Accessories" Additional functions with special numbers see "Information".

 

general

Size

16 25 32 40 50 63 80 100 125 160

Weight

kg

1.2 2.3 4 7.4 10.5 21 27 42 80 150

Ambient temperature range

NBR seals

°C

-30 … +60

FKM seals

°C

-20 … +60

MTTFD values according to EN ISO 13849 1)

Years

150
1) For further details, see data sheet 08012

hydraulic

Size

16 25 32 40 50 63 80 100 125 160

Maximum operating pressure

Port X 1)

bar

315
350
420

Port Z2

bar

-
-
-
315 1)
350 1)
420 1)

Port Y

depending on the maximum tank pressure of the attached directional valve

Maximum flow 2)

l/min

25000

Hydraulic fluid

see table

Hydraulic fluid temperature range

NBR seals

°C

-30 … +80

FKM seals

°C

-20 … +80

Viscosity range

mm²/s

2.8 … 500

Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 3)

Class 20/18/15 according to ISO 4406 (c)
1) dependent on the attached directional valve
2) NG-dependent; see characteristic curves
3) 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

Data sheet

Mineral oils

HL, HLP, HLPD, HVLP, HVLPD

NBR, FKM

DIN 51524

90220

Bio-degradable

1)

Insoluble in water

HETG

NBR, FKM

ISO 15380

90221

HEES

FKM

Soluble in water

HEPG

FKM

ISO 15380

Flame-resistant

Water-free

HFDU (glycol base)

FKM

ISO 12922

90222

HFDU (ester base)

1)

FKM

Containing water

1)

HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)

NBR

ISO 12922

90223

Important information on hydraulic fluids:

For more information and data on the use of other hydraulicfluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). Flame-resistant - containing water: Life cycle as compared to operation with mineral oil HL, HLP 30 … 100%. Maximum hydraulic fluid temperature 60 °C Bio-degradable and flame-resistant – containing water: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.
1) Not recommended for corrosion-protected version "J3" (contains zinc)

Hydraulic fluid

Classification

Suitable sealing materials

Standards

Data sheet

Mineral oils

HL, HLP, HLPD, HVLP, HVLPD

NBR, FKM

DIN 51524

90220

Bio-degradable

1)

Insoluble in water

HETG

FKM

ISO 15380

90221

HEES

FKM

Soluble in water

HEPG

FKM

ISO 15380

Flame-resistant

Water-free

HFDU (glycol base)

FKM

ISO 12922

90222

HFDU (ester base)

1)

FKM

Containing water

1)

HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)

NBR

ISO 12922

90223

Important information on hydraulic fluids:

For further information and data on the use of other hydraulic fluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.).

Flame-resistant – containing water:

Life cycle as compared to operation with mineral oil HL, HLP 30 … 100% Maximum hydraulic fluid temperature 60 °C

Bio-degradable and flame-resistant:

If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.

1) Not recommended for corrosion-protected version "J3" (contains zinc)

For applications outside these parameters, please consult us!

Orifices

Orifice Ø in mm

Order numbers

Material numbers

M6 conical

M8 x 1 conical

G 1/8 conical

G 1/4 conical

G 3/8 conical

G 1/2 conical

G 1 conical

00

0,5

05

R913040356

R913017600

R913030187

R913040456

0,6

06

R913040358

R913017605

R913017606

R913020197

0,7

07

R913040360

R913017609

R913046092

0,8

08

R913029447

R913017614

R913017616

R913017615

R913040481

R913040499

1,0

10

R913019186

R913017621

R913024679

R913017622

R913040484

R913040500

1,2

12

R913040362

R913017627

R913017629

R913017628

R913040486

R913040501

1,5

15

R913028337

R913017637

R913017639

R913017638

R913040488

R913028317

1,8

18

R913030186

R913017644

R913017646

R913017645

R913040489

R913045913

2,0

20

R913029870

R913017651

R913040450

R913017652

R913028417

R913028336

2,5

25

R913032543

R913035796

R913017656

R913019582

R913040493

R913040502

3,0

30

R913040368

R913017661

R913017663

R913017662

R913018266

R913040503

R913040467

3,5

35

R913017667

R913040452

R913040463

R913028318

R913019856

R913040469

4,0

40

R913017670

R913027078

R913040464

R913018265

R913029168

R913040470

4,5

45

R913046571

R913017671

R913040465

R913040506

5,0

50

R913017673

R913040468

R913023871

R913019857

R913040471

5,5

55

R913027077

R913040495

R913053659

6,0

60

R913023870

R913028418

R913020247

7,0

70

R913040461

R913017675

R913040509

7,5

75

R913023430

R913018328

8,0

80

R913046570

R913040510

R913020246

closed

99

R913019128

R913019129

R913019137

R913019136

R913019138

R913019140

Other orifices upon request.

Plug screws

Thread

Tightening torque MA in Nm ±10 %

G 1/8

12

G 1/4

30

G 3/8

55

G 1/2

80

G 3/4

135

G 1

225

G 1 1/4

360

LFA . WEA… (NG16 … 32)

LFA . WEA… (NG40 ... 125)

LFA . WEA… (NG160)

Control cover "WEA" for set-up of a directional valve: NG16 ... 50

Dimensions in mm

1

Name plate at NG16, 25, 32

2

Name plate at NG40 and 50

3

Port X and Y optionally as threaded ports at NG40 and 50

4

Directional spool valve type 4WE 6 D… (pilot control valve), separate order

5

Directional seat valve type M-3SEW 6 … (pilot control valve), separate order

6

Porting pattern according to ISO 4401-03-02-0-05

(mounting thread for version "/12" see data sheet 08936)

NG

D1

H1

H2

H3

L1

L2

L3

L4

L5

L6

L7

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

16 - 40 -
-
15 65 80 - - 17 47.5 4
25 - 40 -
-
24 85 85 - - 27 64 4
32 - 50 -
-
28 100 100 - - 34.5 71.5 4
40 G1/2 60 30
-
32 125 125 72 53 47 84 6
50 G1/2 68 32
-
34 140 140 80 60 54.5 91.5 6

Control cover "WEA" for set-up of a directional valve: NG63

Dimensions in mm

1

Name plate

2

Port X and Y optionally as threaded ports

3

Directional spool valve type 4WE 10 D… (pilot control valve), separate order

4

Directional seat valve type M-3SEW 10 … (pilot control valve), separate order

5

Porting pattern according to ISO 4401-05-04-0-05

(mounting thread for version "/12" see data sheet 08936)

Control cover "WEA" for set-up of a directional valve: NG80 ... 100

Dimensions in mm

1

Name plate

2

Port X and Y optionally as threaded ports

3

Plug screw at type WEB

4

Plug screw at type WEA

5

Directional spool valve type 4WE 10 D… (pilot control valve), separate order

6

Directional seat valve type M-3SEW 10 … (pilot control valve), separate order

7

Porting pattern according to ISO 4401-05-04-0-05

(mounting thread for version "/12" see data sheet 08936)

NG

D1

H1

H2

H3

H4

L3

L4

mm

mm

mm

mm

mm

mm

mm

80 250 80 30 45 45 10 16
100 300 100 24 52.5 55 13 18

Control cover "WEA" for set-up of a directional valve: NG125 ... 160

Dimensions in mm

1

Name plate

2

Port X and Y optionally as threaded ports

3

Plug screw at type WEB

4

Plug screw at type WEA

5

Directional spool valve type 4WE 10 D… (NG125) or type WEH 25 … (NG160) (pilot control valve), separate order

6

Directional seat valve type M-3SEW 10 … (pilot control valve), separate order

7

Porting pattern according to

NG125: ISO 4401-05-04-0-05 NG160: ISO 4401-08-08-0-05

(mounting thread for version "/12" see data sheet 08936)

NG

D1

H1

H2

H3

H4

L3

L4

L5

mm

mm

mm

mm

mm

mm

mm

mm

125 380 105 51 56 51 16 10 23
160 480 150 80 71 80 15 15 46

LFA control cover mounting screws

Hexagon socket head cap screws ISO 4762 - 10.9-flZn/nc/480h/C

​1)

Size

Quantity

Tightening torque MA in Nm ±10 %

16

4

30

25

4

100

32

4

240

40

4

480

50

4

480

63

4

1600

80

8

800

100

8

1600

125

8

3100

160

12

5000

1) Hexagon socket head cap screws UNC, see data sheet 08936

Mounting screws included in the scope of delivery.

Notice:

The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %). The specified tightening torques were calculated with total friction coefficient μ = 0.09 … 0.14; adjust in case of modified surfaces. Supplied mounting screws are only suitable for direct assembly on a block. If an intermediate cover is used, mounting screws have to be designed accordingly longer (see dimensions).

Size 16 ... 63

Dimensions in mm

Size 80 ... 100

Dimensions in mm

Size 125

Dimensions in mm

Size 160

Dimensions in mm

Installation bore and connection dimensions according to ISO 7368

Size 16 ... 63

Dimensions in mm

1

Bore for locating pin

2

80 mm only at control cover for directional valve set-up NG16 (axis X–Y bore)

Size 80 ... 100

Dimensions in mm

1

Bore for locating pin

Size 125

Dimensions in mm

1

Bore for locating pin

Size 160

Dimensions in mm

Required surface quality of the valve contact surface

1

Bore for locating pin

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Connection dimensions according to ISO 7368

NG

16 25 32 40 50 63 80 100 125 160

ØD5 1)

M8 M12 M16 M20 M20 M30 M24 M30 - -

ØD6

mm

4 6 8 10 10 12 16 20 - -

ØD7H13

mm

4 6 6 6 8 8 10 10 - -

H4

mm

20 25 35 45 45 65 50 63 - -

L1

mm

65
80
85
-
102
-
125
-
140
-
180
-
250
-
300
-
-
-
-
-

L2

mm

46
-
58
-
70
-
85
-
100
-
125
-
200
-
245
-
-
-
-
-

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)

Notices:

The specified tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10%). The specified tightening torques were calculated with total friction coefficient μtotal = 0.09 ... 0.14; adjust in case of modified surfaces. Supplied mounting screws are only suitable for direct assembly on a block. If an intermediate cover is used, mounting screws have to be designed accordingly longer.

Mounting screws (included in scope of delivery)

Hexagon socket head cap screws ISO 4762 - 10.9-flZn/nc/480h/C

​1)

Size

Quantity

Tightening torque MA in Nm ±10 %

16

4

30

25

4

100

32

4

240

40

4

480

50

4

480

63

4

1600

80

8

800

100

8

1600

125

8

3100

160

12

5000

1) Hexagon socket head cap screws UNC, see data sheet 08936

Additional functions with special numbers: Control cover (upon request)

Symbol

Type

Size

Description / special characteristic

LFA . WEA16-7X/…

25, 30

Additional external ports X and Y (G1/4)

LFA . WEA54-7X/...

32, 50, 63

Cover for logic zero position open

LFA . WEA54-6X/…

25 ... 50

Additional functions with special numbers (upon request)

Orifice symbol

Orifice symbol

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)

Orifice selection