Butterfly valve with disc type opening and closing a reciprocating rotating 90 degrees to open and close a valve and regulating fluid. Butterfly valve is not only simple structure, small volume, light weight, material consumption, and installation size is small, and small drive moment, the operation is simple, rapid, and at the same time has good flow regulating function and close the sealing performance, so more than ten years development soon, has partly replaced applications of globe valve, ball valve, gate valve, along with the progress of the butterfly valve technology, in the foreseeable in a short period of time, especially in large and medium size, use of low pressure area, butterfly valve will become the dominant form. As a result of the butterfly valve plate movement with polished, so most of the butterfly valve can be used in the medium with suspended solids, according to the strength of the seal, also can be used for powder and granular media. Butterfly valve is a lot of more phyletic, according to the structure, can be divided into middle sealing butterfly valve, single eccentric butterfly Industrial Valves, double eccentric butterfly valve, triple eccentric butterfly valve, ventilation butterfly valve; Points, the form of the seal can be divided into soft sealing butterfly valve, hard seal butterfly valve; According to the mode of connection points, can be divided into flange butterfly valve, wafer butterfly valve, welding butterfly valve, a lug butterfly valve, butterfly valve and vacuum butterfly and health level; According to the drive mode, can be divided into electric butterfly valve, pneumatic butterfly valve, worm gear, handle and so on. Center line butterfly valve, as a kind of used to realize on-off and flow control components, piping system has been used in petroleum, chemical industry, metallurgy, water and electricity is widely used in many fields such as extremely. In butterfly valve technology has been known, its seal form with seal structure, sealing materials for rubber, ptfe, etc. Because of the limitation of structural features is not adapt to the high temperature, high pressure and corrosion resistance, wear resistance, etc. Structure characteristics of the center line butterfly valve as the axis of the stem and disc center, ontology in the same position. Simple structure, convenient manufacturing. Common line with rubber butterfly valve which belongs to and so on. Defect is due to the butterfly plate and valve seat remain the state of extrusion, scratches, is apart from the big, fast wear. To overcome the extrusion, scratches, ensure the sealing performance, basically use the elastic material such as rubber or ptfe seat, but also because of the sealing material in use is limited by temperature, which is why people traditionally butterfly valve is not the cause of the high temperature resistant. Single eccentric butterfly valve is to solve the problem of extrusion of butterfly valve disc and seat, the valve stem and axis deviation from the center of butterfly plate, so that the butterfly plate up and down side is no longer a rotary axis, scattered, relieve excess extrusion disc side and up and down the seat. Is unique in the installation of the single eccentric butterfly valve disc of the valve stem axis is a three axis type structure, the three sections of shaft stem concentric, two shaft sections and ZhongXinDuan axis deviation on both ends of the shaft centerline and a center distance, the butterfly plate is installed on the intermediate shaft section. The eccentric structure makes the disc in full open position double eccentric, while when the butterfly plate rotate to the closed position as single eccentric. As a result of the action of eccentric shaft, near the closing, the butterfly plate to the valve seat seal cone move within a distance, the butterfly plate and valve seat sealing seal faces anastomosis to achieve reliable sealing performance. Double eccentric butterfly valve is also called high performance butterfly valve, environmental infrastructure projects such as dewatering system, especially in waterway on the pipeline, used as adjustment and the closure device. Compared with the center line butterfly valve, double eccentric butterfly valve more resistant to high pressure, longer life and good stability. Double eccentric butterfly valve in single eccentric butterfly valve on the basis of further improvement. Its structure characteristics is in the center of the axis of the stem is deviating from the butterfly plate, also deviates from the center of ontology. The effect of the double eccentric butterfly plate can immediately after the valves are open from the seat, greatly eliminates the butterfly plate and valve seat of unnecessary phenomenon of excessive extrusion, scratches, reduce the opening distance, reduces the abrasion resistance, improve the seat life. Scraping slash, but also makes the double eccentric butterfly Industrial Valves can also use a metal seat, improves the application in the field of high temperature. Center axis of the stem and deviating from the center of the disc and ontology, and seat Angle with the body channel axis rotary axis, known as the triple eccentric butterfly valve. Triple eccentric butterfly valve to high temperature resistant, hard seal must be used, but the large amount of leakage; To zero leakage, must use the soft seal, but it is not resistant to high temperature. In order to overcome this contradiction, double eccentric butterfly valve and eccentric butterfly valve for the third time. The structure characteristics of the double eccentric eccentric axis of the stem position at the same time, make the butterfly plate type sealing face of the cone axis deflection in the cylindrical axis of ontology, that is to say, after the third eccentric, butterfly plate sealing section is no longer true circle, but the ellipse, and so the seal face shape asymmetry, tilt to the center line of the ontology, on the other side is parallel to the centerline of ontology. The biggest characteristic of the third eccentric is fundamentally changed the seal structure and seal position is no longer, but the torque seal, namely not rely on the elastic deformation of the seat, but completely rely on the seat of the contact pressure to achieve sealing effect, thus has solved the problem of metal seated zero leakage. Ventilation butterfly valve structure is to use the center line butterfly plate and short structure steel plate welded together, so its internal components such as no connecting rod and bolt, also won't produce some components in the process of use, so the failure rate is very low. It is convenient to use. Is a reliable valve device. And because it is metal sealing system adopts the closed, although sealing effect than elastic seal, but than elastic sealing, long service life and has the characteristics of high temperature resistance. Ventilation butterfly valve clearance between the butterfly plate and the body is very big, there is enough space, so it is in use process can effectively prevent the heat bilges cold shrink caused because of temperature change, also won't produce the phenomenon of butterfly card by death. ( The above belong to the conventional simple generalization and principle of the butterfly valve)
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