Hydraulics
9803/8500
Issue 1
Main Relief Valve Operation
View X.
As service pressure reaches the pilot setting of the
valve, pilot poppet A lifts, allowing oil to escape into
cavity B and pass down the sides of sleeve C into
the exhaust gallery D.
View Y.
As service pressure continues to rise and oil
escapes from cavity E, the pressure differential
between the upper and lower surfaces of piston F
causes this piston to rise and seat on the point of
pilot poppet A.
Oil continues to escape from the cavity E but the
incoming flow to the cavity has been cut off. This
produces a pressure drop above poppet G, causing
the poppet to lift and release service pressure into
the exhaust gallery D.
Auxiliary Relief Valve Operation
The auxiliary relief valves work in exactly the same
manner as the main relief valve although the
operating pressures will be different.
5 - 10
5 - 10
Descriptions
Section E Section E
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