Flexible sealing lift valve

The invention belongs to the field of lift valves, and particularly relates to a flexible sealing lift valve. The flexible sealing lift valve comprises a valve clack, a valve rod driving the valve clack to act, and a valve seat capable of being matched with the valve clack in a sealing mode. The valve clack is of a bowl-shaped structure, the bowl mouth edge of the valve clack forms a sealing surface matched with the valve seat, and the axial section of the bowl wall of the valve clack is in a wave shape. The flexible sealing lift valve has the advantage of flexibility when the valve clack is matched with the valve seat in the sealing mode, in other words, the bowl wall of the valve clack can generate certain elastic deformation when the valve clack is matched with the valve seat in the sealing mode, then the sealing surface of the valve clack can be finely adjusted when the valve is in a switched-off state and can be tightly attached to a sealing surface of the valve seat to form a linear sealing state, and therefore the sealing performance of the valve is greatly improved; meanwhile, the sealing surface of the valve clack is not likely to be blocked by debris.