Check valves on the valve disc-shaped, around the seat of the shaft for rotation channel, because the valve passage into streamlined, flow resistance than the lift check valve, suitable for low flow rates and flow changes infrequently large diameter occasions, but not for pulsatile flow, the sealing performance is less than lift. Swing check points ill with style, double disc type and mostly type three, these three forms to points mainly on the valve diameter, the purpose is to prevent backflow when the media stops flowing or, weakened hydraulic shock. Shenzhen Shibei Ze valve Limited company lift check valve: valve slide along the vertical centerline of the valve body, lift check valves can be installed in horizontal pipe, small diameter high pressure valve on the valve adopt ball. Lift check valve body shape and the same （with the cut-off valve common）, so it's fluid drag coefficient. Similar to its structure and cut-off valve, the valve body and valve with the same cut-off valve. Valve upper and lower valve cover processing with guide sleeve, valve guide Jane Jane can freely within the valve lift light guide, when the medium downstream, the valve opening thrust by the media, when the media stopped-flow, the valve by self-vertical landing on the seat, to prevent the media from the upstream effect. Straight-lift check valve and valve seat media channels export channel direction perpendicular to the direction; vertical lift check valve, the media channel export channel direction in the same direction with the valve seat, and its flow resistance is smaller than the straight-through.