Zero-leakage bypass valve of dust remover

The zero-leakage bypass valve comprises a valve seat composed of an inner valve seat and an outer valve seat, the inner valve seat is located in the outer valve seat, an inner valve plate is arranged on the inner valve seat, an outer valve plate is arranged on the outer valve seat, a spring is arranged between the inner valve plate and the outer valve plate in a connected mode, a smoke inlet cavity is formed in the bottom of the inner valve seat, and a sealing air pipe is arranged on the side face of the outer valve seat. The outer valve plate is connected with a valve rod, the other end of the valve rod is connected with an air cylinder, and the valve rod can stretch out and draw back up and down. According to the utility model, zero leakage of the double-layer bypass valve of the dust remover is ensured during ignition, boiler failure and normal operation, additional energy consumption is not needed, the problem of large bypass leakage of a bag-type dust remover is well solved, a filter bag is protected fro