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The difference between check valve and butterfly valve

Jun 30,2022 Posted by Bundor

Industry News
What is the difference between a check valve and a butterfly valve? The check valve is opened and closed by the force of the medium, and the fluid can only flow in one direction. Butterfly valve is a shut-off valve, opening and closing are carried out by external force, and can be installed in both directions. In addition, the characteristics of check valve and butterfly valve are also different.

Check Valve Features
Check valve refers to the valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve whose main function is to prevent the backflow of the medium, the reverse rotation of the pump and the driving motor, and the discharge of the container medium.
The function of this type of valve is that it only allows the medium to flow in one direction and prevents the flow in the opposite direction. Usually this kind of valve works automatically. Under the action of fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincident valve flap of the valve flap act on the valve seat, thereby cutting off the flow.
Butterfly valve features
Butterfly valve is a kind of valve that uses a disc opening and closing member to reciprocate about 90° to open, close and adjust the fluid channel.
①Simple structure, small size, light weight, and less consumables, do not use it in large-diameter valves;
② Quick opening and closing, small flow resistance;
③ It can be used for medium with suspended solid particles, and can also be used for powdery and granular media according to the strength of the sealing surface. It can be used for two-way opening and closing and adjustment of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways of metallurgy, light industry, electric power, and petrochemical systems.
① The flow adjustment range is not large. When the opening reaches 30%, the flow will increase to more than 95%;
②Due to the limitation of structure and sealing material of butterfly valve, it should not be used in high temperature and high pressure piping system. The general working temperature is below 300℃ and below PN40;
③The sealing performance is poorer than that of ball valve and globe valve, so it is used in places where sealing requirements are not very high.

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