Check valve function
The check valve is mainly used in the pump water supply system to prevent the impact of the high-pressure water backflow on the pump impeller. When the water pump in the water supply system of the water pump suddenly stops running, the pressure in the pump disappears instantly, and the high-pressure water connected to the outlet of the water pump will flow back to the water pump in the reverse direction. After the non-return valve installed at the outlet of the water pump has no medium pressure, it will be closed immediately to prevent the high-pressure water from flowing back to the pump.
Imagine if there is no check valve installed at the outlet of the water pump, high-pressure water flows back to the water pump in the reverse direction, and the impeller of the water pump reverses under the impact of the high-pressure water. Under the impact of high-pressure water, the impeller may loosen or damage the impeller or other parts in a serious situation. When the pump runs again, the loose or damaged impeller can also fly out, bringing huge safety hazards to the production work.
The check valve in the hot water system is used to prevent hot water from flowing back into the pipeline. If the check valve is not installed, the hot water will flow back, which may scald the pipeline and even hurt people.
Precautions for check valve installation
1. The check valve is a one-way valve, so the installation position, height, and direction of inlet and outlet must meet the design requirements, and the direction of medium flow should be consistent with the direction of the arrow marked on the valve body.
2. Before installing the check valve, check the appearance. The nameplate of the valve should meet the requirements of the current national standard "General Valve Marking" GB 12220. It can be used after all standards are qualified.
3. Don't let the check valve bear weight in the pipeline, especially the large check valve, which should have independent support and not be affected by the pressure generated by the pipeline.