Bottom valve is a kind of energy saving valve, usually installed in the bottom of the suction pump water. Restrictions on the fluid pump tube return water sources, plays not only the function. The cover has a lot of water and reinforcement, on the difficult clogging, mainly used in the pipeline pumping. Waterway and supporting role. Diameter have single, double disc, disc type. There are flanges connection and screw thread connection. Bottom valve by valve body, disc, valve cover, bushings, seals and other parts, as shown in the chart source water from the valve cover to the body. Under the effect of fluid pressure, the valve disc to open water, after the stop in export pressure tube to the disc to close rapidly, the liquid will not fall back into the water, the flow pumping water and reduce water loss.

1, in order to prevent medium counter-current, shall be installed in equipment, devices and pipeline check valve;

2, the check valve generally applies to clean medium, should not be used in medium containing solid particles and viscosity is bigger;

3, generally on the level of nominal menstruation 50 mm pipe should choose vertical lift check valve.

Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve