A one-way valve is a one-way valve, which means that the fluid can only flow along the water inlet, but the medium at the water outlet cannot return.

The check valve is a swing check valve with unlimited installation position. It is usually installed in the horizontal pipeline, but it can also be installed in the vertical pipeline or dumping pipeline.

When installing the check valve, pay special attention to the flow direction of the medium. The normal flow direction of the medium should be consistent with the arrow direction indicated on the valve body, otherwise the normal flow of the medium will be cut off. The bottom valve shall be installed at the bottom of the water pump suction pipeline.

When the check valve is closed, water hammer pressure will be generated in the pipeline, which will cause damage to the valve, pipeline or equipment in serious cases. Especially for the large mouth pipeline or high-pressure pipeline, the check valve selector should pay high attention.

Check valve is only used for one-way opening and closing valve to prevent reverse flow of fluid medium on various pipelines or equipment.

other

Check valves are widely used and have many types. The following check valves are commonly used for water supply and heating:

1. Spring type: the liquid lifts the valve disc controlled by the spring from bottom to top by pressure. When the pressure disappears, the spring force will press the valve disc down to seal the liquid backflow. Commonly used for check valves with smaller diameters.

2. Gravity type: similar to spring type, it is closed by the self gravity of the valve disc to prevent backflow.

3. Swing type: the liquid is directly connected in the valve body, and the rotary disc on one side is pushed open by the pressure. After the pressure is lost, the disc returns to the position by its own weight, and the reverse liquid pressure closes the disc.

4. Plastic diaphragm type: the shell and diaphragm are plastic. Generally, the shell is ABS, PE, PP, NYLON, PC. The diaphragm is made of silicone resin, fluorine resin, etc.

The principle of other one-way valves (check valves), such as the check valve for sewage discharge, the explosion-proof valve for civil air defense, and the check valve for liquid use are similar to each other.

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