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Types and Functions of Check Valve


Ⅰ. Definition of check valve


The definition of a check valve refers to a valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent the medium from flowing back. It is also called a check valve, a one-way valve, a reverse flow valve and a back pressure valve.


Ⅱ. The role of check valve


Check valve is a kind of automatic valve. Its main function is to prevent the back flow of the medium, prevent the pump and drive motor from reversing as well as the release of the container medium. Check valves can also be used to supply pipelines for auxiliary systems where the pressure may rise above the system pressure.


Ⅲ. Classification of check valves


1. Swing check valve


The disc of the swing check valve is disc-shaped, and it rotates around the shaft of the valve seat channel. Because the inner channel of the valve is streamlined, the flow resistance is smaller than that of the lift check valve. It is suitable for low flow rate and non-return valve. Large diameter occasions with frequent changes, but not suitable for pulsating flow, and its sealing performance is not as good as the lifting type. Swing check valves are divided into three types including single valve, double valve and multi-half valve. These three types are mainly classified according to the valve diameter. The purpose is to prevent the medium from stopping or flowing backwards and weaken the hydraulic shock.


2. Lift check valve


A check valve whose disc slides along the vertical centerline of the valve body. A lift check valve can only be installed on a horizontal pipeline. A round ball can be used for the disc of a high-pressure small-diameter check valve. The valve body shape of the lift check valve is the same as the stop valve (which can be used in common with the stop valve), so its fluid resistance coefficient is relatively large. Its structure is similar to the stop valve, and the valve body and disc are the same as the stop valve. The upper part of the valve disc and the lower part of the valve cover are processed with guide sleeves. The disc guide can be moved up and down freely in the valve guide sleeve. When the medium flows downstream, the disc opens by the thrust of the medium. It drops down on the valve seat to prevent the medium from flowing back. The direction of the medium inlet and outlet channel 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 a pin shaft in the valve seat. The disc check valve has a simple structure and can only be installed on a horizontal pipeline with good sealing performance.


4. In-line check valve


A valve in which the disc slides along the centerline of the valve body. In-line check valve is a new type of valve. It is small in size, light in weight, and good in processing technology. It is one of the development directions of check valves. But 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 boiler feed water and steam shut-off valve, it has a comprehensive function of lift check valve and stop valve or angle valve.


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