User manual Pomac PLP Lobe pump
CE/PLP (1406) EN-12 25
5.3.2. Adjusting an air loaded safety valve
1. Ensure the shut-off valves in the pressure line, and possibly in the suction line, are
completely opened. The system must be filled with the liquid to be pumped.
Install a pressure gauge in the pressure line between pump and shut-off valve.
2. Ensure there is no air pressure pplied to the safety valve .
3. Switch on the pump.
4. Slowly apply a maximum of 5 bar air pressure to the safety valve.
! Meanwhile, check if the pressure does not exceed the maximum pressure of the pump!
If it exceeds the maximum pressure of the pump, immediately shut down the pump and
check the system piping!
5. Slowly close the shut-off valve at pressure side until the pressure gauge indicates the
desired opening pressure of the safety valve.
! The opening pressure may never be set higher than the maximum pressure of the pump!
6. Decrease the air pressure until the pressure gauge indicates the pressure starts decreasing.
The valve is now set to the correct pressure.
7. Reset the pressure shut-off valve to the normal opened position.
! Use a monitoring device to check the setting of the air pressure continuously.
If the pressure is rising or dropping a warning signal has to be given to the operator of
the pump to stop the pump immediately !!!
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