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11)
OPERATION OF MAIN RELIEF VALVE
(1)
The pressurized oil passes through the orifice (A) of the plunger is filled up in chamber A of the
inside space, and seats the plunger against the housing securely.
Socket
Chamber A Piston A
P
Housing
Tank
passage
Plunger
(2)
When the pressure at (P) becomes equal to the set pressure of the spring the hydraulic oil
passes through the piston (A) pushes open the poppet and flows to tank passage (T) through the
plunger internal passage, periphery orifice A, chamber A, periphery orifice B and the hole (E).
Piston A
Periphery orifice B
P
passage
(3)
Opening the poppet causes the pressure in chamber A to fall and the plunger to open. As the
result the pressurized oil at port P runs into tank passage (T).
Plunger
P
Poppet
T
Orifice A
Poppet
Tank
Hole E
T
Poppet
Tank
passage
T
Hole A
Spring
Spring
2-42
Piston B
14W92MC36
14W92MC37
14W92MC38
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Troubleshooting
