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Transcript of WEH_301-P-9050001_e
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Safety for HydraulicsDirectional Valve ON/OFF" type, Series WEH
301-P-9050001-E-00/11.021/6 430.90.80.
Reference:Classification:
motion and progress
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Contents Page
1. General description 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Technical data 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.1 General characteristics 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Hydraulic characteristics 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.3 Electrical characteristics 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Performance graphs 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1 Pressure drop through directional valve WEH 18 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Pressure drop through directional valve WEH 20 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Pressure drop through directional valve WEH 25 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Dimensions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Model code key 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1. General description
A B
PX
A B
XTA TB
Series WEH directional valves are sole
noid operated, two stage units that are
suitable for controlling large flow rates.
A flow can be started and stopped, and
its direction controlled, by means of
electrical signals.
This valve was specially developed for
use in mobile equipment. It is distin
guished by its very small size and low
weight.
The valve features a two stage design
i.e. in the absence of a control signal,
the spools of both the pilot and main
stages are moved into their middle, or
neutral, positions by centring springs.
When a solenoid is energised, the
spool moves outwards against the
force of a spring. Pilot control oil is sup
plied externally but is drained internally.
The complete valve designation is de-
termined with the aid of the model code
key (see p. 6, section 5.).
2. Technical data
2.1 General characteristics Design spool valve
Operation solenoid operated (ON/OFF)
Ports (see sect.4.) plant standard
Mounting attitude unrestricted
Hydraulic fluids mineral oils toDIN 51524 and
DIN 51525 (HL/HLP)
Ambient temperature -30 ... 60C
Recommended fluid temp.
Minimum temperature
Maximum temperature
20 ... 60C
-20C
80C
Recommended viscosity range
Minimum viscosity
Maximum viscosity
15 ... 100 mm2/s (cst)
10 mm2/s (cst)
380 mm2/s (cst)
Filtration / cleanliness level ISO 4406 Class 18/15
NAS 1638 Class 9
Weight Size 18
Size 20
Size 25
9 kg
11 kg
17.8 Kg
2.2 Hydraulic characteristics Units Data
Max. pump pressure (in P) bar 350
Max. actuator pressure (in A, B) bar 350
Max. supply pressure for solenoid operated
pilot stage (in X)
bar 350
Min. supply pressure for solenoid operated pilot
stage (in X)
bar 20 bar
above tank
line back
pressure
Max. tank line pressure (in T) bar 50
For actuator flow rates, see performance graphs (section 3)
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2.3 Electrical characteristics Units Data
Nominal voltage 10% V 12 / 24
Power consumption W 33
Duty cycle % 100
Electrical connections ISO 4400
DIN43650
Protection class to DIN VDE 0470 IP65
Material insulation class to VDE 0580 H
3. Performance graphs
3.1 Pressure drop through directional
valve WEH 18
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
0 50 100 150 200 250 300
A / B > T
P > A / B
Pressuredrop[bar]
Flow rate [l/min]
3.2 Pressure drop through directional
valve WEH 20
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
0 50 100 150 200 250 300 350 400
A / B > T
P > A / B
Pressuredrop[bar]
Flow rate [l/min]
3.3 Pressure drop through directional
valve WEH 25
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0 50 100 150 200 250 300 350 400 450 500 550
A / B > T
P > A / B
Pressuredrop[bar]
Flow rate [l/min]
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4. Dimensions
184
B5
B4
B3
H5
HH6
B
D1 D2 D3
H
H4
H3
H2
H1 H1
H2
H4
B
B2
B2
B1
T B P A T
X
Unit dimensions: Subplate interface:
The valve is supplied complete with 4
mounting bolts, class 12.9
The relevant tightening torques are:
Valve Bolt Tightening torque[Nm]
Size 18 M12 94
Size 20 M12 94
Size 25 M16 232
Required quality of the mating surface:
0.01 / 100mmR
max16
Unit dimensions:
Size B B1 B2 B3 B4 B5
18 80 18 0.15 30 0.15 19 80 159
20 80 18 0.15 30 0.15 19 80 159
25 110 26 0.15 40 0.15 26 110 189
Dimensions of subplate interface
Size D1 D2 D3 H H1 H2 H3 H4 H5 H6
18 M12 18 deep 23 4 180 30 0.15 32.5 0,15 51 0.15 65 0.15 280 50
20 M12 18 deep 23 4 200 30 0.15 34.5 0,15 54 0.15 69 0.15 300 50
25 M16 25 deep 30 5 240 40 0.15 43.5 0,15 65 0.15 87 0.15 380 70
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5. Model code key
/
For actuator flow rates, see performance graphs (section 3.)
solenoid op. two stage directional valve
Valve series
= WEH
18 //WWEH / /A 08 C X A 1
plant standard
Interface
= W
18 mm
20 mm
25 mm
Nominal sizes
= 18
= 20
= 25
(see section 4. Dimensions)
entered by the manufacturer
Design code letter
= A
A + B connected to T in neutral
other spool types - contact Bucher
Spool type
= 08
Solenoid on A end (4/2- directional valve)Solenoid on B end (4/2- directional valve)
Solenoid on A and B ends (4/3- directional valve)
Operation
= A= B
= C
X (supply) external, Y (drain) internal
Pilot oil connections
= X
12 V DC
24 V DC
Solenoid voltage
= A
= B
Square connector plug to DIN 43650Electrical connections
= 1
A B
PTA TB
Germany
Phone +49 7742 85 20Fax +49 7742 71 [email protected]
BUCHER HYDRAULICS www.bucherhydraulics.com
France
Phone +33 389 64 22 44Fax +33 389 65 28 [email protected]
Netherlands
Phone +31 79 34 26 24 4Fax +31 79 34 26 28 [email protected]
UK
Phone +44 24 76 35 35 61Fax +44 24 76 35 35 [email protected]
Switzerland
Phone +41 33 67 26 11 1Fax +41 33 67 26 10 [email protected]
Italy
Phone +39 0522 92 84 11Fax +39 0522 51 32 [email protected]
Austria
Phone +43 6216 44 97Fax +43 6216 44 97 [email protected]
China
Phone +86 10 64 44 32 38Fax +86 10 64 44 32 [email protected]
Product Center (Elevator)
Phone +41 41 757 03 33Fax +41 41 757 16 [email protected]
USA
Phone +1 262 605 82 80Fax +1 262 605 82 [email protected]
We reserve the right of modification without notice.
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