Check valve refers to the valve that automatically opens and closes the valve flap depending 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. Check valve function The check valve is an automatic valve, its main function is to prevent the backflow of the medium, prevent the reverse rotation of the pump and the driving motor, and discharge the medium in the container. Check valves may also be used on lines supplying auxiliary systems where pressure may rise above system pressure. Classification of check valves Check valves can be divided according to their structure and installation methods: 1. Swing check valve: The disc of the swing check valve is disc-shaped, and rotates around the axis of the valve seat channel. Because the channel in the valve is streamlined, the flow resistance is smaller than that of the lift check valve. It is suitable for low flow rate and large-diameter occasions where the flow does not change frequently, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the lift check valve. The swing check valve is divided into three types: single-lobe type, double-lobe type and multi-half type. These three types are mainly divided according to the diameter of the valve. 2. Lifting check valve: a check valve whose disc slides along the vertical centerline of the valve body. Lifting check valves can only be installed on horizontal pipelines. For high-pressure small-diameter check valves, the disc can be made of balls. . The valve body shape of the lift check valve is the same as that of the globe valve
(it can be used in common with the globe valve), so its fluid resistance coefficient is larger. Its structure is similar to the globe valve, and the valve body and disc are the same as the globe valve. The upper part of the valve disc and the lower part of the valve cover are machined with guide sleeves. The valve disc guide can be freely lifted and lowered in the valve guide. When the medium flows downstream, the valve disc is opened by the thrust of the medium. It falls vertically on the valve seat to prevent the reverse flow of the medium. The direction of the medium inlet and outlet channels of the straight-through lift check valve is perpendicular to the direction of the valve seat channel; the vertical lift check valve has the same direction of the medium inlet and outlet channels as the valve seat channel, and its flow resistance is smaller than that of the straight-through type. 3. Disc check valve: a check valve in which the disc rotates around the pin shaft in the valve seat. The disc check valve has a simple structure and can only be installed on the horizontal pipeline, and the sealing performance is poor. 4. Pipeline check valve: a valve in which the valve disc slides along the centerline of the valve body. Pipeline check valve is a new valve. It is small in size, light in weight and good in processing technology. It is one of the development directions of check valve. However, the fluid resistance coefficient is slightly larger than that of the swing check valve. 5. Compression check valve: This kind of valve is used as a valve for boiler feed water and steam cut-off. It has the comprehensive function of lift check valve and globe valve or angle valve.
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