Type WEH22
WK 460 110 09.2017
- 13 -
Pre-load valve
versions: ...4WEH22.../...P
P
P
P4,
4,
4,
4,5.
5.
5.
5.
..
...4WEH22.../...P
P
P
P7
7
7
7
...
Directional valve type...W
...W
...W
...WE
EE
EH
H
H
H2
2
2
22...
2...
2...
2...
with internal pilot oil
supply (X
X
X
X
) - versions:
... 4WEH22.../...E...
E...
E...
E...
...4WEH22.../...E
EE
ET
TT
T
...
with spools with pressureless circulation of hydraulic fluid
mu
mu
mu
must be eq
st be eq
st be eq
st be eq u
u
u
uipped
ipped
ipped
ipped w
w
w
wit
it
it
ith
h
h
h tttthe pre-
he pre-
he pre-
he pre-llllo
o
o
oad
ad
ad
ad v
vv
va
aa
allllve
ve
ve
ve ((((2
2
2
2) f
) f
) f
) fiiiixed
xed
xed
xed iiiin
n
n
n
port
port
port
port P
P
P
P
of the main valve (1).
Cracking pressure for pre-load valves:
valve
version P
P
P
P 4.
4.
4.
4.5
5
5
5
- 0,
0,
0,
0,4
4
4
45
5
5
5 M
M
M
MP
P
P
Pa
aa
a
valve version P
P
P
P 7
7
7
7
- 0,
0,
0,
0,7
7
7
7 M
M
M
MP
P
P
Pa
aa
a
For directional valves with fixed pressure ratio valve -
versions ...4WEH22.../...D
D
D
D1
1
1
1
... the pre-load valve P
P
P
P7
7
7
7
must
be applied.
...4WEH22.../...P
P
P
P
...
Perf
Perf
Perf
Perform
orm
orm
orma
aa
ance c
nce c
nce c
nce cur
ur
ur
urves
ves
ves
ves ffffor pre-
or pre-
or pre-
or pre-llllo
o
o
oad
ad
ad
ad v
vv
va
aa
allllves
ves
ves
ves
version ...4WEH22... /...P
P
P
P4,
4,
4,
4,5
5
5
5
...
version ...4WEH22....../...P
P
P
P7
7
7
7
...
Directional valves type...W
...W
...W
...WE
EE
EH
H
H
H2
2
2
22...
2...
2...
2...
may be equipped with
throttle insert (3) in port P
P
P
P
in pilot valve (2) which allows
to delay switching time of the main valve.
P
P
P
P
Throttle insert
version ...4WEH22.../...B.
B.
B.
B.
..
1 - Main valve body
2 - Pilot valve body
3 - Throttle insert
1 - Main valve body
2 - Pre-load valve
0
∆
P
(
M
P
a
)
0,8
0,6
0,4
0,2
1,0
250
100
50
200
150
Q (dm / min)
0
∆
P
(
M
P
a
)
0,8
0,6
0,4
0,2
1,0
250
100
50
200
150
Q (dm / min)
3
3
2
2
1
2
1
3
o
2
ν
= 41 mm /s and temperature t =50 C)
(measured at viscosity
ACCESSORIES FOR STANDARD VERSIONS
OF THE DIRECTIONAL VALVE
...4WEH22.../...B
B
B
B
...
