Two-stage normally-closed valve structure for air suspension

The two-stage normally-closed valve structure comprises a supporting seat, fixed iron is fixedly connected to the top end of the inner wall of the supporting seat, a main spring is connected to the bottom end of the outer wall of the fixed iron, a buffer spring is arranged on the outer wall of the main spring in a sleeved mode, meanwhile, movable iron is connected to the bottom end of the buffer spring, and a valve bush is fixed to the outer wall of the bottom end of the movable iron. A lifting core assembly is arranged on the inner wall of the valve bush, a spring seat is arranged on the outer wall of the lifting core assembly, a lower spring is connected to the lower end of the outer wall of the spring seat, a valve seat is arranged at the bottom end of the inner wall of the supporting seat, and the outer wall of the valve seat is sleeved with an annular filter screen. According to the lifting core assembly, the rubber coating piece is used for replacing an original ball head structure for sealing, the seal