A check valve is a valve that automatically opens and closes by the power of the medium itself. Its main function is to prevent the backflow of water. This valve works automatically. Under the pressure of the fluid flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the fluid pressure and the weight of the valve disc cause the valve disc to act on the valve seat, thereby cutting off the flow. Check valves belong to the category of automatic valves. They are used in pipelines where the medium flows in one direction. They only allow the medium to flow in one direction to prevent accidents. This function of the check valve is of great significance for protecting system equipment and maintaining system pressure.
The function of the check valve is not limited to preventing backflow, but also includes protecting system equipment and maintaining system pressure. When the fluid in the pipeline stops flowing or the flow direction changes, the check valve can automatically close to prevent the fluid from flowing back, avoiding damage to the system or unnecessary pressure fluctuations. In addition, the check valve plays a protective role in the pipeline system, so that the fluid can only flow in the specified direction, which can prevent the backflow from damaging the equipment, pumps or other process equipment or affecting their normal operation. Check valves can also help maintain the system's designed working pressure, ensure the normal flow of fluid in the pipeline, and prevent peak pressure or pressure fluctuations from flowing into the system in a controllable direction.
The structural classification of check valves includes lift check valves and swing check valves. The former is divided into vertical and horizontal types, while the latter achieves the function of blocking the backflow of the medium by rotating the valve along the center. These different types of check valves are selected and used according to specific application scenarios and needs to ensure the safety and efficiency of the system.