Butterfly Valve (Butterfly Valve) refers to the closing piece (disc or disc) for the disc, rotating around the valve shaft to open and close a valve, in the pipeline to cut off and throttle. Butterfly Valve opening and closing piece is a disc-shaped disc, in the body around its own axis rotation, so as to open and close or adjust the goal. Butterfly Valve open to full close is usually less than 90 ° , the Butterfly Valve and the butterfly Rod itself has no self-locking ability, in order to locate the butterfly plate, to install the worm gear reducer on the Valve Rod. The use of worm gear reducer, not only can make the butterfly plate with self-locking ability, so that the butterfly plate stopped in any position, but also improve the operation of the valve performance. Industry-specific Butterfly Valve features high temperature resistance, pressure range is also higher, the valve nominal diameter, the body is made of Carbon Steel, the valve plate seal ring instead of rubber ring. Large-scale high-temperature Butterfly Valve using steel plate welding manufacturing, mainly used for high-temperature medium smoke duct and gas pipeline. Butterfly Valve installation and maintenance should pay attention to the following matters: in the installation, the disc to stop in the closed position. The open position should be determined according to the rotation angle of the butterfly plate. Butterfly Valve with by-pass Valve, open the by-pass valve before opening. Installation should be in accordance with the manufacturer's installation instructions, Heavy Butterfly Valve, should be set on a solid foundation. The advantages of butterfly valve are as follows: Open and close convenient and quick, labor-saving, fluid resistance is small, can often operate. The utility model has the advantages of simple structure, small volume and light weight. Mud can be transported to minimize the accumulation of liquid at the mouth of the pipe. Under low pressure, a good seal can be achieved. Good adjustability. The disadvantages of Butterfly Valve are as follows: use pressure and working temperature range is small. Poor sealing. Butterfly Valve structure can be divided into offset plate type, vertical plate type, inclined plate type and lever type. According to the sealing form can be divided into a more sealed and hard sealed two types. The soft seal type generally uses the rubber ring seal, the hard seal type usually uses the metal ring seal. According to the connection type can be divided into flange connection and clamp connection, according to the transmission mode can be divided into manual, gear transmission, pneumatic, hydraulic and electric several kinds.
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