6-21
Proportional pressure
reducing valve
Filter screen
P
DS
T
P
T
2 (1)
EH17
EH20
EH19
EH22
EH21
EH18
5 (3)
3 (2)
1
4
6 (4)
Hydraulic circuit
DS
( ) : 2-spool
10-2(1)
10-5(3)
10-3(2)
10-6(4)
10-1
10-4
1
2
3
4
5
6
10-1
10-2
10-3
10-4
10-5
10-6
Port
Size
1 ~ 6
DS
P,T
9/16-18UNF
9/16-18UNF
3/4-16UNF
760F6WE33
OPERATION
The proportional pressure reducing valve
(10-1~6) is a direct-acting spool-type valve.
When de-energized, port 2 is closed and
port 1 (delivery) is connected to port 3
(tank). When the inlet pressure fluctuates it
provides an almost constant outlet
pressure-depending on the energization of
the coil. When the control current
increases, the coil solenoid exerts a force
on the control piston which is proportional
to the control current and thereby defines
the regulated pressure at port 1. This
setting is proportional to the control current.
Pressures at tank port 3 are additive to the
set pressure. If, as a result of external
factors, the pressure at port 1 rises above
the preset pressure, the valve opens from
port 1 to tank port 3.
2)
1
3
2
1
2
3
7809A6WE33
5. EH (electro hydraulic) CONTROL BLOCK
STRUCTURE
1)
Summary of Contents for HL955
Page 557: ...7 6 MEMORANDUM MEMORANDUM ...
