10-49
SK714-5 SK815-5 SK815-5 turbo
3.4 PRESSURE COMPENSATION VALVE
Function
•
During compound operations, if the load pressure becomes lower than the other actuator and the oil flow tries to in-
crease, compensation is received. (When this happens, the other actuator being used for compund operation (right
side) is at a higher load than the actuator on this side (left side))..
Operation
•
If the load pressure of the other actuator (right side) becomes higher during compound operations, the oil flow in ac-
tuator circuit
A
on this side (left side) tries to increase.
•
If this happens, the
LS
pressure
PLS
of the other actuator acts on spring chamber
PLS1
, and reducing valve (1) and
flow control valve (2) are pushed to the left in the direction of the arrow.
•
Flow control valve (2) throttles the area of opening between pump circuit
PP
and spool upstream
PPA
, and pressure
loss is generated between
PP
and
PPA
.
•
Flow control valve (2) and reducing valve (1) are balanced in position where the difference in pressure between
PLS
and
PA
acting on both ends of reducing valve (2) and the pressure loss between
PP
and
PPA
on both sides of flow
control valve (2) are the same.
•
In this way, the pressure difference between upstream pressure
PPA
and down stream pressure
PA
of both spools
used during compund operations is the same, so the pump flow is divided in prioportion to the area of opening of
notch
a
of each spool.
RKS00740
A
PPA
PA
PP
W
1
2
PLS1
a
PPA
PA
a
A
W
T
PLS
STRUCTURE AND FUNCTION
CLSS
Содержание SK714-5
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