Rotary lobe pump is a type of positive displacement pump, it generates a fixed amount of fluid per revolution, and the driver’s power decides the pressure. But sometimes rotary lobe pump is not generating correct flow or pressure; this can be caused by some factors below.
The pump is not operating
Ensure the driver and other parts are operational and the pump is not locked up.
The pump speed is too low
Check the operating speed.
Leak in piping
Check suction and discharge piping for leaks.
Pressure gauge or instrumentation defective
Inspect and replace it.
Loss of vacuum pressure
Check suction piping for leaks.
The pump is run dry
Inspect the valve and pipe; fill fluid into the pump chamber.
Check lobes and replace them.
Wear plates, liners or pump housing worn
Adjust or replace it; the reverse side of the wear plates is available.
The defective pressure relief valve
Inspect, adjust and replace pressure relief valve.
Pump efficiency reduces with pressure. Let the pump is working at the standard range of pressure.