Working principle:

The sealing surface of the valve core is a cubic curved surface, and the sealing surface of the valve seat is a primary conical surface.At the sealing point, the valve seat surface is actually a section of the cubic surface of the valve core, so the combination is very perfect. It has self-adaptation (automatic center positioning and overlap) and wear compensation functions.

Because the rotation center deviates from the geometric center of the valve core, the valve core entity will continuously retreat and shrink inward when the valve core is opened, and the valve core entity will continuously move forward and expand outward when the valve core is closed. Its function is equivalent to the combination of hemispherical valve, gate valve, stop valve and butterfly valve. 

The main function of a two-way flow valve is to seal well under positive pressure and under reverse pressure or when the reverse pressure is greater than the positive pressure. 

When positive pressure acts, the medium pressure pushes the valve plate forward, the valve stem deforms, the valve plate sealing surface is close to the valve seat sealing surface to transmit pressure, and the valve seat is pushed to the valve body step to make it seal well. 

When reverse pressure acts, the medium pressure pushes the valve plate backward, the valve stem deforms, and the medium pressure pushes the valve seat backward at the same time. The valve seat sealing surface is close to the valve plate sealing surface to transmit pressure, and the valve seat is pushed to the limit deformation position of the valve stem to make it seal well .