The disc of the lift check valve slides along the vertical center line of the valve body. The lift check valve can only be installed in the horizontal pipeline. The shape of the body of the lift check valve is the same as that of the stop valve (which can be used in general). The upper part of the disc and the lower part of the cover are machined with a guide sleeve. The guide cylinder of the disc enables the disc to rise and fall freely along the vertical center line of the valve body. When the medium flows downstream, The valve disc is opened by the medium thrust. When the medium stops flowing, the valve disc falls on the valve seat by the self-weight and the medium thrust, which prevents the medium countercurrent.