During the use of the valve, the medium flows in the direction of the arrow in the diagram.
When the medium flows in the specified direction, the valve flap is opened by the force of the medium;
When the medium flows backwards, due to the self-weight of the valve disc and the action of the reverse force of the medium on the valve disc, the valve disc and the sealing surface of the valve seat are tightly closed to prevent the reverse flow of the medium.
The sealing surface of the valve body and disc is made of stainless steel surfacing
