Patent ID: 11555544

Abstract:
The present invention discloses a butterfly valve including: a valve body, an inner valve seat, a valve core, a valve stem and at least one positioning ring. The valve body has an inlet end, an outlet end, and an axial passage communicating with the inlet end and the outlet end. A valve stem mounting hole is provided between the inlet end and the outlet end in the valve body. The valve body further is provided with a valve seat mounting portion in the axial passage at a position corresponding to the valve stem mounting hole. The inner valve seat is fixedly mounted to the valve seat mounting portion, which is cylindrical and is provided with radial through hole in the side wall corresponding to the valve stem. the valve core is plate-shaped and mounted in the inner valve seat, a radial through hole is provided therein. The valve stem passes through the valve stem mounting hole, the radial through hole of the inner valve seat and the radial through hole of the valve core. The positioning ring is mounted in the valve body at an axial side of the inner valve seat and form a hermetic connection with the inner valve seat. The butterfly valve of this invention has good tightness.