Classification and Principle Analysis of Check Valves

Check valve opening means that the valve flap is opened by the forward flow of the medium. The same reason the medium flows backward to push the valve flap to close. The check valve is also called a check valve, check valve, reverse flow valve and back pressure valve. Most of them are automatic valves, the main function of which is to prevent the medium from flowing backward, to prevent the pump and the drive motor from reversing, and to prevent the use of the medium in the container. It is also used for safety protection in auxiliary systems where the pressure may rise above the system pressure.

classification

The check valve is mainly used to prevent the medium in the pipeline from flowing backward. The foot valve and duckbill valve also belong to the check valve system category.

The check valve can be divided into three types: lift type, swing type, and dish type:

⑴The lifting type is divided into two types: vertical and horizontal. The lifting type structure moves along the axis.

Example: ① Lifting type mute check valve is used in pipelines with high-quality requirements for water supply and drainage engineering; at the same time, it can be installed at the outlet of the pump and requires a relatively high pressure (PN2.5Mpa) pipe network, which is a waterproof impact check valve Important product.

② Lifting muffler check valve is suitable for high-rise building water supply and drainage system and pump outlet, not suitable for sewage pipeline occasions.

③ Horizontal check valve is suitable for submersible, drainage, sewage pumps, especially for sewage and sludge systems.

There are two types of single-lobed, double-lobed, and multi-lobed. The selected structure is based on the center of gravity rotation.

Example: ① Selective-open rubber check valve is used in the urban water pipe network system, which is not suitable for sewage pipelines with a lot of sediment.

② Swing check valve has the widest range of use and can be installed in water supply and drainage, petroleum, chemical, metallurgical, industrial and other pipelines. It is most suitable for places with limited space.

(3) The disc structure is straight-through.

Example: The disc type double flap check valve is mainly used in the water supply pipeline of high-rise buildings, and used in fluid pipe networks containing corrosive media and sewage.

② Swing check valve has the widest range of use and can be installed in water supply and drainage, petroleum, chemical, metallurgical, industrial and other pipelines. It is most suitable for places with limited space.

③ Horizontal check valve is suitable for submersible, drainage, sewage pumps, especially for sewage and sludge systems.

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