Butterfly check valve flow refers to rely on the media itself, and automatically open and close the disc, the valve is used to prevent the backflow medium, also called the non-return valve, check valve, flow valve, and the back pressure valve. Check valve belongs to a kind of automatic valve, its main role is to prevent the backflow medium, to prevent the pump and drive motor reversal, and the discharge of the container medium. Check valve can also be used to give the pressure could rise to more than the system pressure of the secondary system supply piping. Check the main can be divided into swing check valve ( In accordance with the center of gravity rotating) And lift check valve ( Move along the axis) , butterfly check valve ( Along the center rotation) 。 The structure characteristics of the butterfly check Industrial Valves, butterfly check valve including swing check valve and lift check valve. Swing check valve with the humble hinge institutions, there is also a disc freely like door on the tilt of the seat surface. In order to ensure that each disc to seat the appropriate location, in valve design hinge agencies, so that the disc with enough space of a swing, and real, comprehensive, and the valve seat contact. All disc can be made from metal, can be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements. Swing check valve in the fully open conditions, almost unimpeded fluid pressure, so the pressure drop across the valve is relatively small. Lift check valve on the disc is located in the body of the valve seat sealing surface. In addition to this check valve can be freely valve movements, like the rest of the cut-off valve, fluid pressure from the valve seat sealing surface lift, medium return led to the disc back to seat, and cut off the flow. According to the conditions of use, valve can be all-metal structure, it can also be embedded in disc shelves rubber mat or rubber ring form. Like a cut-off valve, fluid through the lift check valve channel is narrow, so the lift check valve through the pressure drop than the swing check valves are bigger, and swing check valves are very few restrictions. Butterfly check valve installation process: 1. Butterfly check valve can be installed horizontally ( Arrow parallel horizontal ground) , also can be installed in a vertical ( Arrow direction perpendicular to the horizontal ground) , in general, the DN is larger than 400 make use of horizontal installation. 2. Before installation for pipeline cleaning, to flash a comprehensive inspection, to ensure that the condition before loading line, load time pay attention to the direction of the arrow and medium run in the same direction. 3. The valve should be installed at the inlet of the filter, the exit to install a butterfly valve or gate valve, so that the valves and other equipment maintenance. 4. When solid flange bolts, symmetric homogeneous solid should be paid attention to.
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