General Description; Theory Of Operation; Pressure Reducing Valve - Daewoo Solar 225LC-V Shop Manual

GENERAL DESCRIPTION

THEORY OF OPERATION

The damper valve is divided into two areas of operation. There is the pressure reducing valve (a) and the
damper mechanism (b). The following hydraulic circuit is an example of a remotely located control valve.
1
2
Figure 1
Reference
Number
1 Remote Control Valve
2
3

Pressure Reducing Valve

1. Neutral Condition
If pedal is in neutral, spool is pushed up by return spring and spring seat. Port (P) is blocked by
bottom part of spool and four operating ports (left forward and backward, right forward and backward)
are connected to port (T) through inner hole of spool.
2. Half Operation Condition
If pedal is moved, push rod moves down, and they transmit this force through spring seat and control
spring to spool. If spool is moved, primary pressure is transmitted through an inner hole of spool to
operating port. If lever is stopped in middle position, compressed control spring force and secondary
pressure transmitted through hole acts at bottom part of spool, balance is maintained by hydraulic
force acted upward, and then this pressure is transmitted to traveling spool of control valve. That is,
Travel Control Valve (With Damper)
3
Description
Pilot Pump
Main Pump
5
4
Reference
Description
Number
4 Control Valve
5 Hydraulic Motor
6 Hydraulic Cylinder
6
ARS1810L
S0709820K
Page 3