During operation, the medium flows in the direction indicated by the arrow.
1. When the medium flows in the designated direction, the valve disc is opened by the force of the medium. In the event of backflow, the disc closes-sealing against the valve seat-due to its own weight and the reverse force of the medium, thereby preventing backflow.
2. The sealing surfaces of the valve body and disc feature stainless steel overlay welding.
3. The face-to-face dimension complies with GB12221-1989, and the flange connection dimensions comply with JB/T79-1994.
