Port relief valve operation
The function of port relief valve is to release the shock pressure inside of actuator during neutral condition
Overload
1. Cylinder pressure is lower than set-pressure.(close)
2. Cylinder pressure is reached to set-pressure.(pilot poppet open)
3. Small piston which is inside of main poppet moves to right and sit on the pilot poppet. Main poppet
open and makes tank-passage.
Make-up (anti-cavitation)
4. Cylinder pressure drop down to the vacuum pressure. Main poppet will be opened by tank pressure and
fill up the cylinder chamber.
Picture text:
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