The check valve is an important fluid control device. Its basic structure consists of valve body, valve disc, spring (or weight) and actuator. As the core part of the valve, the valve body has an internal channel design that matches the inner diameter of the pipe to ensure that the fluid can pass through unimpeded. The valve disc is a key component of the check valve. Its function is to automatically open or close according to the flow direction of the fluid, thereby effectively preventing the backflow of the fluid. The spring or weight is responsible for providing the force required to close the valve disc, while the actuator is used to accurately control the opening and closing of the valve disc.

In the structural design of the check valve, there are several key features worth paying attention to. The design of the valve disc is crucial. In order to ensure that it can be closed quickly and reliably, the valve disc is usually made of lightweight and wear-resistant materials such as stainless steel or hard alloy. These materials not only have good mechanical properties, but also maintain stable performance in harsh environments. In addition, the shape and size of the valve disc are carefully optimized to ensure that it can fit tightly with the valve seat when closed, thereby achieving excellent sealing effect. Some high-performance check valves also use a swing valve disc design, which allows the valve disc to rotate around the pin to open when the fluid flows in the forward direction, and quickly close when the fluid flows in the reverse direction. This design not only improves the flow capacity, but also reduces the fluid resistance.

The design of the valve seat is also a key link in the structural design of the check valve. The valve seat is usually made of the same material as the valve disc to ensure good wear resistance and sealing when the two are in contact. The shape and inclination angle of the valve seat are precisely calculated to reduce the impact force and friction resistance when the valve disc is closed, thereby extending the service life of the valve. In addition, many modern check valves use an elastic valve seat structure. This design allows the valve seat to undergo a certain elastic deformation when the valve disc is closed, thereby further enhancing the sealing effect and ensuring the reliability of the valve under various working conditions.

In terms of the design of the actuator, the check valve also embodies many technological innovations. Many high-end check valves use spring-return cylinders or hydraulic cylinders as actuators. This design is not only simple in structure and reliable in action, but also easy to maintain. The independent design between the actuator and the valve closing part ensures that the valve closing part can still operate normally even if the actuator fails, thereby improving the safety and reliability of the valve. In addition, some check valves are also equipped with additional functions such as valve switch position signal output and valve opening position local indication. These functions provide great convenience for remote monitoring and maintenance of the valve, further improving the intelligence level of the system.