Main relief valve operation
The function of main relief valve is limit the maximum system pressure.
PL1-OFF
1. Pump pressure is lower than the set-pressure.(close)
2. Pump pressure is reached to the set-pressure.(pilot poppet open)
3. Main poppet open and pump line has tank-connection.
4. Pressure drop down.(pilot poppet close)
5. Main poppet close.
PL1-ON
1. Boost signal comes from port PL1 and push the piston to increase the tension of spring.
Picture text:
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