IV-9
HYDRAULIC UNITSHST PUMP
T6D115
21
4
5
Charge Check and High Pressure Relief
Valve
This valve has two functions: a charge check valve
and a high-pressure relief valve. The charge check
valve function supplies the closed circuit with the
oil from the charge pump to replenish the oil flushed
into the tank by the flushing valve. The high pressure
relief valve function prevents the hydraulic circuit
from being damaged by the increased pressure due
to the oil supplied from the pump in succession and
keeps the hydraulic circuit at an appropriate pres-
sure.
Charge Check Valve
If the pressure in the charge circuit (1) becomes
higher than that in the closed circuit (2), a gap is
generated between the check valve (4) and the
spring holder (3) and so the oil flows into the closed
circuit (2).
High Pressure Relief Valve
If the pressure in the closed circuit (2) becomes
higher than the force exerted by the spring (5), the
check valve (4) is moved to the left and so the oil
flows into the charge circuit (1).
Charge Relief Valve
The charge relief valve keeps the charge supplied
from the charge pump at a steady and constant
level. The oil from the charge pump reaches as
high as chamber A. When the pressure in chamber
A increases to the point where it exceeds the force
exerted by spring (2) holding down relief valve (1),
it moves relief valve (1) and the oil runs out of the
tank.
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