A check valve is a valve used to control the one-way flow of fluid, also known as a non-return valve or a check valve. Check valves are usually installed in pipeline systems. Their function is to prevent fluid from flowing back in the pipeline, thereby ensuring that the fluid can only flow in one direction. This type of valve is widely used in liquid, gas and steam systems to ensure the safe operation of the system and the normal flow of fluids.

 The working principle of the check valve is to use the valve disc or valve cover to open when the fluid flows in the forward direction and close when the fluid flows in the reverse direction, thereby achieving one-way flow control. It can prevent the backflow of liquid or gas in the pipeline system, causing damage to the equipment and pipeline system or affecting the normal operation of the system.

 There are many types of check valves, including lift check valves, swing check valves, butterfly check valves, ball check valves, etc. Each type of check valve has its applicable occasions and characteristics. . The selection of check valves should be reasonably selected based on factors such as the working pressure, medium, temperature, and flow of the pipeline system to ensure that it can work properly and meet the requirements of the system.