The DDC-JQ-B series electromagnetic vacuum inflation valve is a specialized valve installed on a mechanical vacuum pump. The valve and pump are connected to the same power source, and the opening and stopping of the pump directly controls the opening and closing of the valve. When the pump stops working or the power supply is suddenly interrupted, the valve can automatically close the vacuum system and charge the atmosphere into the pump chamber through the pump inlet, avoiding pump oil backflow from polluting the vacuum system. The applicable working medium is air and non corrosive gases.