The DYC-JQ series electromagnetic vacuum pressure differential inflation valve is a specialized valve installed on mechanical vacuum pumps. Installed at the inlet of the mechanical vacuum pump and synchronized with the pump for opening and closing. When the pump stops working or the power supply is suddenly interrupted, the valve can rely on the pressure difference between the atmosphere and vacuum to automatically close the valve plate, seal the vacuum system, maintain its vacuum degree, and charge the atmosphere into the pump chamber through the throttle hole of the valve to avoid pump oil backflow polluting the vacuum system. The applicable working medium is air and non corrosive gases.