Application: The primer,priming device,sliding vane rotary vacuum pump,vacuum Pump Primed Self-Priming Pumps,Vacuum pump set, Vacuum Priming Pump,Water diversion device,Vacuum pump water diversion device,suction device can achieve vacuum suction and pressure maintenance functions. It solves the problem of air-induced water before the pump starts, ensuring that the pump can start quickly at any time. Vacuum self-priming pumps/primer/pump self-priming devices do not require a foot valve on the pipeline, only ensuring that there is a sufficient amount of induced oil in the oil cup before operation, simplifying the pipeline system and improving working conditions.