Check valve is a kind of automatic valve, everyone should be relatively unfamiliar with the check valve, its main role is to prevent the reverse flow of media, prevent the reverse rotation of the pump and the drive motor, and the release of the container media, is to ensure the mechanical function Normally play a key part in protecting the safety of equipment. The role is very big, today Xiao Bian and everyone together to understand what the role of the check valve and related knowledge!
What is the role of check valve
The main reason for the check valve is that we stop the flow, so that different materials can be selected to prevent the flow of many kinds of media such as water and water vapor. The main materials are carbon steel and cryogenic steel. Metal material. Its main characteristic is that the valve flap is closed quickly, the use of the period is longer, and the performance is more reliable.
Check valve principle introduction
The one-way check valve automatically opens and closes the valve flap depending on the flow of the medium itself. The valve used to prevent the back flow of the medium is also called a check valve, a one-way valve, a backflow valve, and a back pressure valve. The check valve is an automatic valve whose main function is to prevent the reverse flow of the medium, prevent the reverse rotation of the pump and the drive motor, and release the medium of the container. The role of this type of valve is to allow only the medium to flow in one direction and prevent the direction of flow. Normally, this type of valve operates automatically. The valve flap is opened by the fluid pressure flowing in one direction. When the fluid flows in the opposite direction, the fluid pressure and the self-closing flap of the valve flap act on the valve seat to shut off the flow.
Check valve type
1. Swing check valve: It is suitable for large diameter occasions with low flow rate and infrequent flow changes, but it is not suitable for pulsating flow. It is mainly used to prevent the hydraulic impact from being reduced when the medium stops flowing or reverses flow. Divided into single-valve, double-look and most of the three forms.
Second, the lift check valve: lift check valve can only be installed in the horizontal pipe, can be common with the cut-off valve, from the media to prevent the counter-current effect.
Third, the disc check valve: valve flap rotation around the valve seat within the check valve. The disc check valve has a simple structure and can only be installed on a horizontal pipe, and the sealing performance is poor.
Fourth, the pipeline check valve: Pipeline check valve is a new type of valve, its small size, light weight, good processing technology, is one of the development direction of the check valve.
Fifth, the compact check valve: This valve is used as boiler feed water and steam shut-off valve, which has a lifting check valve and globe valve or angle valve integrated function.
In addition, there are some non-return valves that are not suitable for pump outlet installation, such as bottom valve, spring type, Y type, and other non-return valves.
The above is the introduction of the check valve function and principle brought by Xiao Bian to everyone. After reading it, we have more understanding of the check valve. I hope the above introduction can help everyone. If you want to know other relevant information, please Continue to pay attention to this site, more exciting so stay tuned!
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