Destandard lift check valve is widely used in nominal pressure PN16-PN40, working temperature -29~550℃ of petroleum, chemical, thermal power station and other working conditions of the pipeline, the applicable medium is: water, oil, steam and so on. Its main function is to prevent the backflow of the medium, to prevent the reverse of the pump and its drive motor, as well as the leakage of the medium in the container. 1, the lifting check valve is an automatic sealing valve, the valve depends on …