Slowly-closed wafer check valve

The utility model provides a slowly-closed wafer check valve. The check valve comprises a valve body, a valve clack, a valve shaft and a torsional spring arranged on the valve shaft in a sleeving mode. A medium channel used for medium circulation is formed in the axial direction of the valve body. The medium channel comprises an inlet end and an outlet end; the two sets of valve clacks, the two sets of valve shafts and the two sets of torsional springs are symmetrically arranged relative to the center of the valve body. The damping device is positioned at the inlet end; the damping device comprises a cylinder body inserted into the valve body, a piston rod located in the cylinder body, a spring and a sealing cover connected with the outer end of the cylinder body. A first cavity and a second cavity which are communicated with each other are formed in the cylinder body, the section of the second cavity is square, the sectional area of the second cavity is larger than that of the first cavity, and a movable blo