The check valve opening and closing parts are opened or closed by the force of the medium flow to prevent the backflow of the medium, which is called a check valve. The check valve belongs to the automatic valve category, mainly used on the pipeline where the medium flows in one direction, and only allows the medium to flow in one direction to prevent accidents.

According to the structure, the check valve can be divided into lift check valve, travel check valve and butterfly check valve.

Lift check valve can be divided into vertical and horizontal.

The swing check valve is divided into three types: single-lobe, double-lobe and multi-lobe.

The butterfly check valve is a straight-through type.

The installation of the check valve should pay attention to the following matters.
1. Do not place weight on the check valve in the pipeline. Large check valves should be independently supported so that they are not affected by the pressure generated by the piping system.
2. When installing, pay attention to the direction of medium flow should be consistent with the direction of the arrow shown on the valve body.
3. Lift vertical check valves should be installed on vertical pipes.
4. Lift check valves should be installed on horizontal pipes
Check valves are mainly divided into: lift, swing flange check valve, flange check valve, lift check valve, swing check valve, high pressure check valve and other products.