H44b ammonia swing check valve is an automatic valve that automatically opens and closes by the force generated by the flow of the medium itself in the pipeline. The check valve is used in the pipeline system, and its main function is to prevent the backflow of the medium, the reverse rotation of the pump and its drive motor, and the discharge of the medium in the container. The check valve can also be used to supply the auxiliary system whose pressure may rise above the main system pressure.