Stop check valve is a valve with two functions. It can be used as a check valve to limit the flow of medium, and it can also be used as a cut-off valve to stop the flow of medium. 10 swing check valve is a commonly used valve. Its structure is divided into Y-shaped, T-shaped, double pole and other types; according to the use scene, it is divided into two types: vertical and horizontal. Stop check valve 10 is widely used in fluid control systems in petrochemical, water treatment, electric power, metallurgy, papermaking and other industries. It can effectively control the flow of media and protect equipment safety.