A seal makes it possible to seal the cartridge between P (pressure) and T (return to the tank).
Pilot operated pressure relief valves are more sensitive to pollution than direct acting pressure relief valves.
Pollution is responsible for the majority of failures that make the pressure relief valve leaking:
- The jet that gets clogged.
- The defective seal ensuring the internal sealing of P to T.
- A broken spring that no longer closes the valve (pilot stage or power stage).
5- Setting
- Loosen the pressure relief valve.
- Install a pressure gauge on the circuit (between the pump and the directional valve).
-Switch the pump on at maximum speed.
- Activate a movement to put a cylinder in mechanical stop.
- Tighten the pressure relief valve by checking the rise in pressure on the pressure gauge.
- If the cylinder moves, stop the adjustment.
- Once the cylinder stops, finish the adjustment.