Tandem gas valve

A tandem gas valve, comprising a valve body and two solenoid valves with identical structures, wherein

• an inlet passage, a first chamber, a second chamber, a third chamber and an outlet passage are successively provided on the valve body along a gas flow path, a first valve seat is provided between the first chamber and the second chamber, and a second valve seat is provided between the third chamber and the outlet passage;
• upper ends of the first valve seat and the second valve seat are respectively provided with a sealing rib and inclined surfaces located at both sides of the sealing rib, an upper end face of the valve body is provided with first openings at positions corresponding to the first valve seat and the second valve seat, the two solenoid valves are arranged corresponding to the first openings;
• a piston rod is movably provided in the two solenoid valves, an end portion of the piston rod is movably connected with a sealing gasket, and an upper end face of the sealing gasket is provided with a pressure plate;
• a concave cavity is provided at a middle position of the sealing gasket;
• an elastic piece with a hole in the middle is provided on an inner side wall of the concave cavity along a circumferential direction thereof, and the elastic piece divides the concave cavity into a movable cavity and a connecting cavity;
• a lower end portion of the piston rod is provided with a limiting block which is limited to the connecting cavity, and a lower end face of the limiting block is arranged in an arc shape;
• the piston rod is sheathed with a return spring;
• and
• when the two solenoid valves are powered off, the sealing gasket is in contact with the sealing rib under the action of the return spring to close the first valve seat and the second valve seat, and when the two solenoid valves are energized, the sealing gasket is separated from the sealing rib under the action of the piston rod to open the first valve seat and the second valve seat.