Supply D371X-16T plug all copper Shanghai high-valve Wafer butterfly hard seal flange copper butterfly ..

Butterfly works: Butterfly with circular disc and with the stem for opening and closing member is rotated to open, close and adjust a valve fluid channel. Butterfly valve plate is mounted on the pipe diameter direction. Cylindrical channel in the valve body, disc-shaped disc around the axis of rotation, rotation angle between 0 ° ~ 90 °, the rotation to 90 °, the valve is open all license conditions. Butterfly known as flap valve, a control valve simple structure, but also can be used to switch control of the low-pressure pipeline medium. Butterfly (English: butterflyvalve) refers to closed parts (disc or disc) to the disc around the valve axis to achieve the opening and closing a valve in the main pipeline from the off and throttling. Valve opening and closing member is a disc-shaped butterfly plate in the valve body around its own axis, so as to achieve the purpose of opening and closing or adjusting. Valve fully open to fully closed is usually less than 90 °, butterfly and butterfly stroke itself is not self-locking capability, in order to position the disc to install the worm gear on the stem. Using worm reducer, not only can make the disc with self-locking capability, so the disc stop in any position, but also to improve the valve performance. , Industry-specific characteristics of butterfly valves to high temperature, higher pressure range, the valve nominal diameter large, carbon steel valve body, the valve plate seal with a metal ring in place of the rubber ring. Large temperature valve with welded steel manufacturing, mainly for smoke duct and gas pipelines high temperature media. Butterfly's development history: the 1930s, the United States invented the butterfly valve, the 1950s introduced to Japan, the 1960s was widely used in Japan, while in China it is a matter of promotion after the 1970s. The world in general DN300 mm butterfly valve has gradually replaced the valve. Valve and valve opening and closing time is short compared to the operating torque, small installation space and light weight. To DN1000, for example, butterfly about 2T, while the gate of about 3.5T, and the valve is easy with a variety of drive combinations, with good durability and reliability. When the rubber seal butterfly valves for throttling drawback is that, due to improper use will produce cavitation, the rubber seat spalling, damage from happening. To this end, the international community has now developed metal sealing butterfly valve, cavitation area decreases, in recent years, China has also developed a metal sealing butterfly valve, in Japan in recent years has also developed resistance to cavitation, low vibration, low noise comb butterfly. General sealing seat of life under normal circumstances, the rubber 15 Year - 20 years, 80 years of metal - 90 years. But how correct choice they should according to working conditions. Butterfly valve use: Currently, the butterfly as a piping system used to implement off and flow control components, has been used in many fields of petroleum, chemical, metallurgy, water, electricity and very widely used. It has been known butterfly valve technology, the seal forms enclosed structure, sealing material for rubber, PTFE and so on. Since the structure of the restrictions, suitable for high temperature, high pressure and corrosion resistance, abrasion resistance and other industries. Present a more sophisticated three eccentric butterfly valve is metal seal butterfly valve, valve and seat components for the piece, the valve seat sealing surface layer welding temperature, corrosion resistant alloy material. Multilayer soft stacked ring fixed in the valve plate, this butterfly valve in comparison with conventional high temperature, easy operation, open and close without friction, closed with the transmission of the torque increases to compensate for seal, to improve a butterfly sealing performance and extended service life advantages. In the form of butterfly classification: 1. According to the structure in the form of classification (1) Center sealing butterfly valve (2) a single eccentric seal butterfly valve (3) double eccentric sealing butterfly valve (4) three eccentric sealing butterfly valve 2. According to the sealing surface material classification (1) soft sealing butterfly valve. 1) Sealing of non-metallic soft materials soft non-metallic materials. 2) Sealing material made of non-metallic rigid metal soft material. (2) metal seal butterfly valve. Sealing a metallic hard material metal hard material. 3. Press the seal in the form of classification (1) forces sealed butterfly valve 1) elastic sealing butterfly valve. Sealing pressure when the valve is closed by the valve plate squeeze the elastic valve seat or valve plate produce 2) applied torque sealing butterfly valve. Sealing pressure by the applied torque generated in the valve shaft (2) pressurized sealing butterfly valve. Sealing pressure from the valve seat or valve plate elastic member generating pressurized sealing element (3) self-sealing valve. Sealing pressure generated automatically by the media pressure. 4. According to the working pressure classification (1) vacuum valve. Working pressure is lower than standard atmospheric heap butterfly calendar. (2) low-pressure valve. Nominal pressure PN <1.6MPa butterfly. (3) pressure valve. , PN is 2.5--6.4MPa butterfly. (4) High-pressure valve. , PN is 10.0--80.0MPa butterfly. (5) high pressure valve. Nominal pressure PN> 100MPa butterfly. 5. According to the working temperature classification (1) high temperature butterfly valve. t> 450C butterfly (2) Temperature butterfly. 120C