Vehicle System System Operation 26
PF Relief Valve
Working principle is same as main relief valve.
Instruction is omitted here.
Over-load Relief Valve (Port Over-flow Valve)
Working principle is same as main relief valve.
Below is only the description of cavitation-proof.
When working port pressure is lower than that off
low-back port, main poppet is open and flow-back oil
goes into working port to play the function of
cavitation.
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