Check valve, also known as check valve or check valve, its role is to prevent the backflow of media in the pipeline. The bottom valve of the water pump suction close also belongs to the class of check valve. The opening and closing parts are automatically opened or closed by the flow and force of the medium to prevent the backflow of the medium. The check valve belongs to the automatic valve class, which is mainly used on the pipeline with one-way flow of the medium, and only allows the medium to flow in one direction to prevent accidents.

According to the structure of the check valve, it can be divided into three kinds: lift check valve, swing check valve and butterfly check valve. Lift check valves can be divided into vertical check valves and horizontal check valves. Swing check valves are divided into single-disc check valves, double-disc check valves and multi-disc check valves. The butterfly check valve is a straight-through check valve, and the above check valves can be divided into three kinds in the connection form: threaded check valve, flanged check valve and welded check valve.

Check valve installation should pay attention to the following things:

1, do not make the check valve bear weight in the pipeline, the large check valve should be independently supported, so that it is not affected by the pressure generated by the pipe system.

2, when installing, pay attention to the direction of the medium flow should be consistent with the direction of the arrow on the valve body.

3, lifting vertical flap check valve should be installed on the vertical pipe.

4, lifting type horizontal flap check valve should be installed on the horizontal pipeline.

What is a vertical check valve?

Vertical check valves are widely used in systems that need to prevent media backflow, such as pump outlets, hot water refill ends, and suction ends of centrifugal pumps. Its role is to prevent the possible consequences of the backflow of the medium, such as the outlet of the pump is not installed vertical check valve, high-speed backflow water will cause a huge impact on the pump impeller when the pump suddenly stops; If the suction end of the centrifugal pump is not installed with a vertical check valve (bottom valve), it is necessary to fill the pump every time it is started.