Flange swing check valve suitable for nominal pressure 1.6~25MPa. Operating Temperature -29~550℃ oil,chemical, pharmaceutical, fertilizer, power industry and other conditions of pipeline , for medium, water, oil, steam and acid media, etc. Swing check valve, also known as a one-way valve or check valve, its role is to prevent the pipeline medium back flow. H44H swing check valve is to rely on the flow of the medium itself and automatically open, close the disc, used to prevent the reverse flow of the medium of the valve. Check valve is also a kind of automatic valve, its main function is to prevent the reverse flow of the medium, to prevent the reversal of the pump and the driving motor, and the discharge of the medium of the container.