Sanitary welded butterfly valve

The utility model provides a sanitary welded butterfly valve, which relates to the field of butterfly valves and comprises a valve body, a bonnet is welded at the top of the valve body, a valve stem is slidably embedded in the bonnet along the vertical direction, the bottom end of the valve stem extends into the valve body, a butterfly plate is welded at the bottom end of the valve stem, and packing is arranged between the inner surface wall of the bonnet and the outer surface of the valve stem. According to the utility model, when the valve body is closed, the valve body is opened; butterflyplate rotation, therefore, the sealing gasket is extruded; the sealing gasket extrudes the sliding rod; therefore, a sliding rod drives a circular plate to extrude a spring; deformation of spring, through the restoring force of the spring, the sealing gasket can be tightly attached to the outer side of the butterfly plate, meanwhile, a circle of sealing ring is attached to the outer side of the butterfly plate, the sealin