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Check valve (check valve) Opening and closing pieces of the medium flow and power to open or close their own to prevent the media back to the valve called the check valve. Check valves are automatic valves, mainly used for medium flow of one-way pipe, only allow medium to flow in one direction to prevent accidents. Check valve, also known as one-way valve or check valve, its role is to prevent pipeline backflow of media. Water pump off the bottom valve also belongs to the check valve category. Check valve according to the structure, can be divided into lifting check valve, swing check valve and butterfly check valve three. Lift check valve can be divided into vertical and horizontal two. Swing check valve is divided into single-valve, double-valve and multi-valve three. Butterfly check valve is straight-through, the above types of check valve in the connection form can be divided into thread connection, flange connection and welding three. Check valve installation should pay attention to the following matters: 1, do not make the check valve in the pipeline to bear the weight of large check valve should be independent support, so that the impact of pressure from the pipe system. 2, when installing, pay attention to the direction of the flow of the medium should be consistent with the arrow direction of the body ticket. 3, vertical drop-check valve should be installed in the vertical pipe. 4, lift-level flap check valve should be installed on the level of the pipeline. Check valve has been widely used in various fields of petroleum, chemical, liquefied gas, boiler steam system, mineral, water supply and drainage, food, pharmaceutical, power generation, urban construction, municipal administration, and residents daily life.