Also known as a non-return valve, a check valve is a type of valve that achieves one-way flow by relying on the pressure of the medium itself to actuate its valve core. Its core components include a valve body, a valve core and a spring.

The working principle is as follows: when the medium flows in the forward direction, its pressure overcomes the spring resistance to open the valve core, creating a flow passage. When the medium flows in the reverse direction, the valve core is pressed tightly against the valve seat under the combined action of spring force and reverse medium pressure, cutting off the pipeline flow.

Characterized by a simple structure, reliable operation and no need for manual intervention, this valve can effectively prevent equipment damage or system pressure disorder caused by medium backflow. It is widely used in scenarios such as pump outlets, pressure vessel outlets and oil-gas transmission pipelines, serving as a basic protective component to ensure one-way flow in pipeline systems.