Vulcanization molding rubber valve sleeve for butterfly wafer check valve and butterfly wafer check valve

The valve sleeve is characterized by comprising a circular sleeve embedded in a valve body, two supporting end faces are oppositely arranged on the sleeve wall of the sleeve in the axial direction, a valve shaft hole and a valve clack positioning shaft hole are formed in the supporting end faces, and a sealing waterline is arranged in the valve shaft hole and the valve clack positioning shaft hole; a sealing table is arranged at the bottom of the sleeve; the butterfly wafer check valve comprises a valve body, a valve shaft, two valve clacks, two torsion springs, a valve clack positioning shaft and an adjusting gasket, and is characterized in that a vulcanization molding rubber valve sleeve is additionally arranged, the two ends of the valve shaft are inserted into valve shaft holes respectively, and the valve clack positioning shaft is inserted into the valve clack positioning shaft holes; the two valve clacks are sealed on the sealing table under the pressing of the force application end of the torsion sprin