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

During use, the medium of the multifunctional check valve flows in the direction indicated by the arrow in the diagram.

3. The sealing surfaces of the multifunctional check valve body and valve disc are made of stainless steel overlay welding.

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