2-WAY CARTRIDGE VALVES, DIRECTIONAL FUNCTIONS

LFA..D (standard)

Material #: R900929930

Model : LFA32D-7X/FV

With remote control port

This product is not available. Please call 888-REXROTH to speak to a local distrubutor who can assist in locating your part or a suitable replacement

With remote control port

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 are realized for the function. A1, A2, A3. 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

08

09

LFA

D

/

F

Type

01

Control cover LFA

LFA

Size

02

NG16

16

NG25

25

NG32

32

NG40

40

NG50

50

NG63

63

NG80

80

NG100

100

NG125

125

NG160

160

Version

03

Control cover with remote control port

D

Component series

04

Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) (NG16 … 63)

7X

Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) (NG80 … 100)

6X

Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions) (NG125 … 160)

2X

Remote control port

05

With remote control port

F

Nozzle fitting

06

Orifice in channel X

1)

X**

Corrosion resistance

07

None

no code

Improved corrosion protection (240 h salt spray test according to EN ISO 9227)

J3

Seal material

08

NBR seals

no code

FKM seals

V

Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)

Connections, mounting and plug screws

09

Mounting screws, metric; connections inch thread

no code

Mounting screws UNC; connections UNF

/12

1) 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.

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

Without directional valve

bar

420

Port X 1)

bar

315
350
420

Maximum flow 2)

l/min

25000

Hydraulic fluid

see table "Hydraulic fluid"

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
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: 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!

Type LFA . D…/F

Type LFA . D…/FX**

Size 16 ... 63

Dimensions in mm

1

Name plate at NG16, 25

2

Name plate at NG32

3

Name plate at NG40, 50, 63

4

Port X optionally as threaded port

NG

D1

D2

H1

H2

H3

H4

▢ L1

L2

L3

T1

mm

mm

mm

mm

mm

mm

mm

mm

16 G 1/8 M6 27 12 15 8 65 32.5 4 8
25 G1/4 M6 30 16 24 12 85 42.5 5 12
32 G1/4 M6 35 16 28 16 100 50 5 12
40 G1/2 M8 x 1 60 30 32 - 125 72 5 14
50 G1/2 M8 x 1 68 32 34 - 140 80 5 14
63 G3/4 G3/8 82 40 50 - 180 90 5 16

Size 80 ... 160

Dimensions in mm

NG

D1

D2

D3

H1

H2

H3

H4

L3

T1

mm

mm

mm

mm

mm

mm

mm

80 250 G3/8 G3/4 70 35 45 - 3 16
100 300 G1/2 G1 75 40 52.5 24 3 18
125 380 G1 G1 1/4 105 50 61 31 4 20
160 480 G1 G1 1/4 147 70 74 42 4 20

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

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.

Connection dimensions according to ISO 7368

Size 16 ... 63

Dimensions in mm

Size 80 ... 100

Dimensions in mm

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

Size 125

Dimensions in mm

Size 160

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)

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

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)

Additional functions with special numbers (upon request)

Symbol

Type

Size

Description / special characteristic

LFA . D9-7X/…

16 … 63

Cap, blind cover

LFA . D10-7X/…

16 … 63

Cap, blind cover

LFA . D49-7X/…

16 … 40

Spacer cover

Suitable for producing a measuring plate

LFA . D54-6X/F

16 ... 50

Cover for logic zero position open (pulling logic)

LFA . D54-7X/F

50

Orifice selection

Orifice selection

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

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