Lifting check valve working principle and structure

Lifting check valve working principle and structure

The lift check valve is the most commonly used check valve. It is powered by the flow of the medium itself. The valve that controls the valve switch is used to prevent backflow of liquid and gas. Therefore, it is called check valve and one-way. Valve, counterflow valve or back pressure valve. The check valve is an automatic valve that does not require manual control of the valve. In addition to preventing the backflow of liquid gases in the pipeline, it also prevents the reversal of clicks and drive clicks, as well as the discharge of container media. The check valve can be mainly divided into two types: a swing type and a lift type. The swing type is rotated by the center of gravity, and the lift type is moved along the axis.

Principle and structure description:

1. When the medium flows in the specified direction, the valve flap is subjected to the medium force. When the medium is reversed by the medium, the valve flap and the sealing surface of the valve seat are closely sealed due to the self-weight of the valve disc and the reverse force of the valve flap. Closed, to prevent the reverse flow of the medium.

2. The sealing surfaces of the valve body and the disc are made of stainless steel.

3. The structural length of the valve is in accordance with the provisions of GB12221-1989, and the flange connection size is in accordance with the provisions of JB/T79-1994.