1. When the medium flows in the specified direction, the multifunctional check valve disc is opened under the action of the medium force; When the medium is in reverse flow, due to the weight of the valve disc and the reverse force of the medium on the valve disc, the sealing surface of the valve disc and the valve seat are tightly closed, achieving the goal of preventing the medium from flowing back.

2. During the use of a multifunctional check valve, the medium flows in the direction of the arrow shown in the diagram.

3. The sealing surfaces of the multi-functional check valve body and disc are welded with stainless steel.

4. The structural length of the multi-functional check valve shall comply with the provisions of GB12221-1989, and the flange connection size shall comply with the provisions of JB/T79-1994.