Fluorine-lined Check Valves Have Various Structural Classifications

The structure of Lined Check Valve can be roughly classified into the following structures:
The first type is a fluorine-lined check valve whose disc is disc-shaped and rotates around the valve seat. The valve channel is streamlined, so it is suitable for this structure, but it is not suitable for pulsating flow because the sealing performance of this valve is not as good as that of a lift check valve.
The second type of disc slides along the vertical center of the valve body. This type can only be installed on horizontal pipes. For high-pressure and small-diameter valves, it is recommended to use a spherical disc. The disc opens with the thrust of the medium. When the medium stays, the disc falls on the valve seat by gravity, which can effectively prevent the medium from flowing back. This valve is a new type of valve with a small size, light weight, and excellent processing technology. It is one of the development directions of fluorine-lined check valves, but the fluid resistance is greater than that of swing check valves.
The third type is a fluorine-lined check valve whose disc rotates around the pin shaft in the valve seat. This valve has a simple structure and can only be installed on horizontal pipes, and has relatively good sealing performance.
There are many types of fluorine-lined check valves, and the above three are only a small part of them. Their main purpose is to prevent the backflow of the medium when it stops and to reduce the hydraulic impact. In addition, there are many fluorine-lined valves that are not suitable for installation at the pump outlet, such as the Y-type check valve, which will not be introduced here.