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Check Valve Simple Structure, Low Cost
Aug 14, 2017

1, the role of check valve

Check valve, also known as anti-valve, single-valve, check valve or check valve, its role is to ensure that the pipeline in the medium flow without flow.

Check valve opening and closing is to rely on the medium flow force to open and close. Check valve is an automatic valve product, check valve only allows the media to flow in one direction of the pipeline to prevent the phenomenon of media reflow occurred. Its use of a wide range, applicable to the size of caliber, a variety of media, high voltage system used in power stations.

2, the principle of check valve

Check valve is to rely on the medium to flow to open the valve, the same reason the media back to push the valve and closed, check valve also known as the check valve, check valve, counter valve and back pressure valve. Mostly belong to the automatic valve, the main function is to prevent the media back to prevent the pump and drive motor reversal and container media discharge use. But also for the pressure may rise to more than the system pressure in the auxiliary system for security protection.

3, check the classification of the valve

The check valve is mainly used to prevent the media in the pipeline back to use. Bottom valve and duckbill valve is also a check valve class.

Check valve can be divided into lift type, swing type, dish type three:

⑴ lift type is divided into vertical and horizontal two, lift structure is moving along the axis.

Example: ① lift mute check valve is used in the water supply and drainage engineering quality requirements of the pipeline; at the same time can be installed at the pump outlet, requiring pressure (PN2.5Mpa) relatively high pipe network, is waterproof shock check valve Of the important products.

② lifting muffler check valve for high-rise building water supply and drainage system and the pump outlet, not suitable for sewage pipe occasions.

③ Horizontal check valve for diving, drainage, sewage pump, especially for sewage and sludge systems.

⑵ swing is divided into single-valve, double-valve and multi-petal, open-Kai structure is based on the center of gravity rotation.

Examples: ① election Kai rubber check valve used in urban water pipe network system, not suitable for sediment accumulation of sewage pipes.

② Swing-type single-valve check valve with the widest range, can be installed in the water supply and drainage, petroleum, chemical, metallurgy, industrial and other pipelines, space restrictions on the most appropriate occasions.

⑶ dish structure for the straight type.

Example: Disc double check valve is mainly used in high-rise building water supply pipeline, containing corrosive media and sewage in the use of fluid pipe network.

② Swing-type single-valve check valve with the widest range, can be installed in the water supply and drainage, petroleum, chemical, metallurgy, industrial and other pipelines, space restrictions on the most appropriate occasions.

③ Horizontal check valve for diving, drainage, sewage pump, especially for sewage and sludge systems.

Check valve by structure, can be divided into lift check valve, swivel check valve and butterfly check valve three. Lifting check valve can be divided into vertical and horizontal two. Swing check valve is divided into single-valve, double-valve and multi-valve type three. Butterfly check valve for the straight-through, more than a few check valves in the form of connection can be divided into threaded connection, flange connection and welding three.

1, lift the structure of the check valve is generally similar with the cut-off valve, the valve along the channel in the line for lifting movements, reliable action, but the fluid resistance is large, suitable for small caliber occasions. Lifting check valve can be straight and vertical two. Straight-through lift check valves can only be installed in the horizontal pipe, and vertical lift check valve is generally installed in the vertical pipe.

2, swivel check valve of the valve flap for the rotation of the shaft. Its fluid resistance is generally less than the lift check valve, it is suitable for larger caliber occasions. Swing check valve according to the number of discs can be divided into single-swivel, double-flap and multi-flap open three. Single flap check valve is generally suitable for medium caliber occasions. Large diameter pipe selection single flap check valve, in order to reduce the water hammer pressure, it is best to reduce the water hammer pressure slow closing check valve. Double flap check valve for large and medium diameter pipe. The double-flap-type check valve has a small structure and a light weight. It is a fast-acting check valve. The multi-flap check valve is suitable for large diameter piping.

3, diaphragm check valve has a variety of structural forms, are used as the opening and closing diaphragm, because of its waterproof hammer performance, simple structure, low cost, in recent years, rapid development. But the use of diaphragm check valve temperature and pressure by the diaphragm material restrictions.

4, ball-type sewage check valve: the valve body with full-channel structure, with a large flow, the advantages of small resistance. The use of ball to do the valve, for high viscosity, suspended solids industrial and domestic sewage pipe network

5, butterfly check valve structure similar to the butterfly valve. Its structure is simple, flow resistance is small, water hammer pressure is also small.





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