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LC 25 A20E7X/

Standard series
Size 16 … 160
Component series 6X, 2X, 7X
Maximum operating pressure 420 bar
Maximum flow 25000 l/min
Size 16 … 160
Component series 6X, 2X, 7X
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  • LC 25 A20E7X/

  • Rexroth

  • R900910270

  • Valve poppet with or without damping nose

  • 2 area ratios

  • 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 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.



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02

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04

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LC






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Type

01

Cartridge valve

LC

Size

02

Size 16

16

Size 25

25

Size 32

32

Size 40

40

Size 50

50

Size 63

63

Size 80

80

Size 100

100

Size 125

125

Size 160

160

Spool design

1)

03

A1 : A2 = 2 : 1 (A2 = 50 %)

A

A1 : A2 = 14.3 : 1 (A2 = 7 %)

B

Cracking pressure

04

0 bar (without spring)

00

approx. 0.5 bar

05

approx. 1 bar

10

approx. 2 bar

20

approx. 3 bar (NG125 only)

30

approx. 4 bar (not NG125)

40

Damping

05

Valve poppet without damping nose

E

Valve poppet with damping nose

D

Component series

06

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

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

4)

2X

Seal material

07

NBR seals

no code

FKM seals

V

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

1)See "Product description"
2)Size 16 ... 63
3)Size 80 ... 100
4)Size 125 ... 160



general

Size

16253240506380100125160

Weight

kg

0.250.51.11.93.97.213274475

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

16253240506380100125160

Maximum operating pressure 1)

Anschluss A

bar

315
350
420

Port B

bar

315
350
420

Maximum flow 2)

l/min

42090015002500350065008500130001800025000

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 – 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)

Size of the annulus area

Surface in cm2

Version

Size

16

25

32

40

50

63

80

100

125

160

A1

LC..A..

1,89

4,26

6,79

11,1

19,63

30,02

37,9

63,6

95

160,6

LC..B..

2,66

5,73

9,51

15,55

26,42

41,28

52,8

89,1

133,7

224,8

A2

LC..A..

0,95

1,89

3,39

5,52

8,64

14,0

18,84

31,4

48

79,9

LC..B..

0,18

0,43

0,67

1,07

1,85

2,90

3,94

5,9

9,3

15,7

A3

LC..A..

2,84

6,16

10,18

16,62

28,27

44,2

56,74

95

143

240,5

LC..B..

2,84

6,16

10,18

16,62

28,27

44,2

56,74

95

143

240,5

Spool form (damping nose)


Version

Size

16

25

32

40

50

63

80

100

125

160

Stroke

cm

LC..E..

0,9

1,17

1,4

1,7

2,1

2,3

2,4

3,0

3,8

5,0

LC..D..

0,9

1,17

1,4

1,9

2,3

2,8

3,0

3,8

4,8

6,5

Pilot volume

cm3

LC..E..

2,56

7,21

14,3

28,3

59,4

102

136

285

544

1203

LC..D..

2,56

7,21

14,3

31,6

65,0

124

170

361

687

1563

Theoretical pilot flow

1)

l/min

LC..E..

15,4

43,3

86

170

356

612

816

1710

3264

7218

LC..D..

15,4

43,3

86

190

390

744

1020

2166

4122

9378

1)Theoretical pilot flow for realization of a switching time of 10 ms

Notice:

Spools with damping nose are mainly used in applications with stroke limitation and spool position monitoring. Due to the better flow values, we recommend the spool without damping nose by default.

Cracking pressure in bar


Version

Size

16

25

32

40

50

63

80

100

125

160

Direction of flow A to B

LC..A 00..

0,02

0,025

0,05

0,05

0,05

0,07

0,07

0,1

0,15

0,15

LC..A 05..

0,35

0,35

0,36

0,35

0,37

0,31

0,44

0,43

0,43

0,45

LC..A 10..

0,70

0,68

0,72

0,71

0,67

0,64

0,88

0,88

0,88

–

LC..A 20..

2,03

2,18

2,12

2,02

2,01

2,0

1,75

1,75

1,76

1,94

LC..A 30..

–

–

–

–

–

–

–

–

2,05

–

LC..A 40..

3,50

3,90

3,80

4

4,11

3,8

3,13

3,04

–

4,42

LC..B 00..

0,014

0,02

0,035

0,035

0,035

0,05

0,05

0,07

0,1

0,1

LC..B 05..

0,25

0,26

0,26

0,25

0,28

0,23

0,31

0,31

0,31

0,32

LC..B 10..

0,49

0,50

0,51

0,51

0,48

0,47

0,63

0,63

0,62

–

LC..B 20..

1,44

1,62

1,52

1,44

1,5

1,5

1,26

1,25

1,25

1,4

LC..B 30..

–

–

–

–

–

–

–

–

1,45

–

LC..B 40..

2,48

2,90

2,70

2,86

3,05

2,8

2,25

2,17

–

3,35

Direction of flow B to A

LC..A 00..

0,04

0,05

0,1

0,1

0,1

0,14

0,14

0,2

0,30

0,33

LC..A 05..

0,69

0,78

0,72

0,7

0,84

0,68

0,88

0,88

0,86

0,91

LC..A 10..

1,38

1,53

1,42

1,43

1,47

1,37

1,77

1,78

1,73

–

LC..A 20..

4,05

4,91

4,25

4,06

4,57

4,33

3,53

3,54

3,50

3,9

LC..A 30..

–

–

–

–

–

–

–

–

4,0

–

LC..A 40..

6,96

8,74

7,6

8,05

9,34

8,15

6,3

6,2

–

8,76

LC..B 00..

0,24

0,25

0,5

0,5

0,5

0,8

0,7

1,0

1,5

1,5

LC..B 05..

3,69

3,40

3,64

3,64

3,95

3,27

4,2

4,6

4,4

4,6

LC..B 10..

7,43

6,69

7,24

7,37

6,88

6,62

8,4

9,4

8,9

–

LC..B 20..

21,3

21,5

21,6

20,9

21,4

20,9

16,9

18,7

17,9

20

LC..B 30..

–

–

–

–

–

–

–

–

20,7

–

LC..B 40..

36,6

38,3

38,6

41,5

43,6

39,4

30,2

32,5

–

44,7

(For applications outside these values, please consult us!)



Installation bore according to ISO 7368

Dimensions in mm

1

Depth of fit

2

Port B may be positioned around the central axis of port A. However, it must be observed that the mounting bores and the control bores are not damaged.

NG

 16 25 32 40 50 63 80 100 125 160

ØD1H7

mm

 32 45 60 75 90 120 145 180 225 300

ØD2

mm

 16 25 32 40 50 63 80 100 150 1) 200 1)

ØD3

mm

 16 25 32 40 50 63 80 100 125 160

(ØD3*) 2)

mm

 25 32 40 50 63 80 100 125 160 250

ØD4H7
25 34 45 55 68 90 110 135 200 270

H1

mm

 42.5 57 68.5 84.5 97.5 127 170.5 205.5 255 368

H2

mm

 56 72 85 105 122 155 205 245 300 425

mm

 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.1 + 0.15 + 0.15

H3

mm

 43 58 70 87 100 130 175 210 257 370

mm

 + 0.2 + 0.2 + 0.2 + 0.3 + 0.3 + 0.3 + 0.4 + 0.4 + 0.5 + 0.5

H5

mm

 11 12 13 15 17 20 25 29 31 45

H6

mm

 2 2.5 2.5 3 3 4 5 5 7 8

mm

 - - - - - - - - ± 0.5 ± 0.5

H7

mm

 20 30 30 30 35 40 40 50 40 50

H8

mm

 2 2.5 2.5 3 4 4 5 5 5.5 5.5

mm

 - - - - - - - - ± 0.2 ± 0.2

W

mm

 0.05 0.05 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1

Ro 1)

mm

 2 2 2 4 4 4 4 4 4 6.3

Ru 1)

mm

 1 1 1 1 1 1 1 1 1 1
1) Maximum dimension
2) 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*.



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