The bottom valve is an energy-saving valve, usually installed at the bottom of the pump underwater suction. Limit the return water of the liquid in the pump tube, plays not only into the function of the valve cover there is a lot of water supplies and strengthen tendons, played a clogging, the main applications in the pipeline pumping. watercourses and supporting role. caliber single lobe, double valve, Orange Peel type flanged and threaded connections. 
 The end of the valve body, valve, valve cover, bushings, seals and other parts See the figure below water, water from the valve cover into the body fluid under pressure, the valve flap to open water, when the show stopped exports tube pressure the valve is rapidly closed, the liquid will not pour back to the water, played the role of the smooth pumping and saving water energy loss. 
 1, in order to prevent the media from countercurrent, equipment, installations and pipelines should be installed non-return valve; 
 2, check valve generally applicable to pure media, should not be used to contain solid particles and the viscosity of the medium; 
 3, the general in nominal vertical lift check valve should be selected by a horizontal pipe 50mm; 
 Shanghai Tang Yang valve, bottom valve products: F-style cast iron bottom valve, H42X bottom valve, JIS-10K handle at the valve end of the cast iron, pvc bottom valve, the SSDF water bottom valve, stainless steel bottom valve