butterfly valve is derived from the name of the wing body of the butterfly plate. Cylindrical channels in butterfly valve body and disc disc around its axis of rotation, simply turning 90 & deg; You can open and close the valve. Butterfly valve in the line is mainly used as cut and throttling. Butterfly valve in the oil, chemical industry, city gas, urban heating, water treatment and other general industrial application is very wide, can also be applied to thermal power condenser and cooling system. Butterfly valve sealing pair is usually use the elastic sealing material such as rubber, plastic, and metal to metal seal form. For elastic seal, seal to be set within the body channel, can also be set around the disc. As a cut, sealed performance is significantly superior to metal seal, but resilient sealing material temperature limits. Although metal seal can adapt high working temperature, also live longer than average elastic sealing butterfly valve, but it is difficult to be completely sealed, as a result, more commonly used for throttling. Used for cutting metal hard seal butterfly valve, have more than ten Industrial Valves factory production. Due to different seal deputy agency forms, its sealing performance also each are not identical. Butterfly Industrial Valves has the following advantages: 1. Small volume, light weight. Compared with the same stress level and gate valves of the same size, the weight can reduce 30% ~ 50%. 2. Simple structure, quick opening and closing. Orgnaization of butterfly valve parts is less, more compact,, just put the disc rotate 90 & deg; Can. 3. Adjusting and sealed performance is good, can realize hierarchical control flow, regulating performance. With elastic material such as rubber plastic as a sealing ring, compression, reply the performance good, good sealing. 4. Fluid resistance and operating torque is small. According to the butterfly valve the flow resistance of the test data, flow resistance of butterfly valve is less than the ball valve, plug valve, flat gate valve and other types of valves. In addition, due to the closed disc stress for approximate balance state, with a fairly small torque can open valve, so the operating torque is small. Many different kinds of butterfly valves, according to its characteristics and use, generally can be divided into the following two categories: 1. Type sealing butterfly valve in this butterfly valve is closed to guarantee completely sealed, in the line can be cut off, sealing ring usually use rubber or plastic. But at present, our country also adopt sealing ring made of metal material, known as the eccentric double or triple eccentric, also can ensure good sealing performance, as shown in figure 2 9. 2. Non sealing butterfly valve that cannot guarantee full seal when closed, can only be in the line for throttling. The seal material is usually used in metal. Figure 2 - 10. As a flow control with the butterfly valve, metal seal USES mostly. Have the wafer butterfly valve and pipeline connection way, double flange and the flange three, but the most commonly used is the wafer and the double flange. The wafer is in the stud valve connection between the two flanges in the pipeline. Body form for single flange, flange or u-shaped cross section, as shown in figure 2 Figure 2-11 ~ 13.

double the Industrial Valves is bolted flange connection will even end flange connection respectively on the pipe flange, as shown in figure: 2 - 14. With u-shaped cross section of wafer butterfly valve body, if meet above the flange and pipe connection methods, can also be referred to as the flange type butterfly valve. The mechanism and principle of butterfly valve particularly suitable for the production of large diameter of the large diameter valve in the pipeline. At present our country has been able to produce the largest diameter butterfly valve for DN5350 nominal size. But for tides and ocean thermal energy conversion system of a bigger size, are currently in the process of developing.

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