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Type selection, structure, working principle and application of butterfly valve

Manual of butterfly valve metal hard seal welding butterfly valve clip butterfly valve flange butterfly valve welding butterfly valve hard seal butterfly valve soft seal butterfly valve fluorine lined butterfly valve rubber lined butterfly valve stainless steel butterfly valve cast steel butterfly valve brass butterfly valve regulating butterfly valve eccentric butterfly valve ventilation butterfly valve telescopic butterfly valve signal butterfly valve manual butterfly valve worm wheel butterfly valve pneumatic butterfly valve vacuum butterfly valve plastic butterfly valve American standard butterfly valve Japanese standard butterfly valve German standard middle line butterfly valve eccentric butterfly valve high temperature butterfly valve lining butterfly valve high performance butterfly valve large diameter butterfly valve cut off butterfly valve hydraulic control butterfly valve check butterfly valve rubber butterfly valve clamp butterfly valve gas butterfly valve high pressure butterfly valve heavy hammer butterfly valve automatic butterfly valve quick opening butterfly valve elastic hard seal butterfly valve multi-level hard seal butterfly valve Stainless steel hard seal butterfly valve PTFE seal butterfly valve anti condensation butterfly valve lug butterfly valve pipe network flange butterfly valve welded hard seal butterfly valve extended rod double clip butterfly valve extended rod flange butterfly valve imported from Japan butterfly valve imported from America butterfly valve imported from Germany butterfly valve imported from France high vacuum butterfly valve pneumatic high vacuum butterfly valve Electric high vacuum butterfly valve butterfly valve is a kind of valve whose closing part (disc or disc) is a disc and rotates around the valve shaft to open and close. It is mainly used for cutting off and throttling on the pipeline.
 Type selection, structure, working principle and application of butterfly valve
Neville valve butterfly valve series products: imported butterfly valve, German butterfly valve, British butterfly valve, Japanese butterfly valve, American butterfly valve. Butterfly valve, butt welding butterfly valve. Pneumatic butterfly valve, pneumatic vacuum butterfly valve, pneumatic flange butterfly valve d643, d641, pneumatic clip butterfly valve d671, d673, pneumatic soft seal butterfly valve d671, d672, d641, pneumatic hard seal butterfly valve d673h, d643h, d663h, electric butterfly valve, electric clip butterfly valve d973, d971, electric flange butterfly valve D941, D943, electric soft seal butterfly valve d971x, d972x, D941X, electric hard seal butterfly valve d943h, d973h, D 963H。 Manual butterfly valve D71, d73, d41, d43, D63, worm gear butterfly valve d373, d343, D371, d341, d363. Eccentric hard seal butterfly valve, multi-level hard seal butterfly valve, elastic hard seal butterfly valve, manual soft seal butterfly valve, single eccentric soft seal butterfly valve fbex, WBGX, wbex, wblx, fbpx, wbpx. Telescopic butterfly valves sd343h and sd341x. Lug type butterfly valve ltd371x. Signal butterfly valve wbsx (xd371x). Rubber lined butterfly valve d371j. Fluorine lined butterfly valve d341f and half lined butterfly valve d371fh. Insulation butterfly valve bd343h. High temperature butterfly valve, high pressure butterfly valve, two-way hard seal d373, d343h-100c / P. Ventilation butterfly valve d341w / d941w-6, electric ventilation multi leaf butterfly valve dbd-0.5. Zaw-6. Plastic butterfly valve D71X / 371x-6s. Manual vacuum butterfly valve GI. Stainless steel butterfly valve, aluminum alloy butterfly valve, cast steel butterfly valve, cast iron butterfly valve, middle line butterfly valve. Non pin butterfly valve, sanitary butterfly valve and other products
Imported butterfly valve structure diagram butterfly valve standard butterfly valve details butterfly valve model butterfly valve operation / application butterfly valve size butterfly valve price list butterfly valve specification butterfly valve working principle butterfly valve installation diagram
Internal structure of butterfly valve body material: cast iron, cast steel, stainless steel, chromium molybdenum steel, aluminum alloy, brass, sealing surface material: H, J, F46, y, W. The working pressure is 0.6-10mpa, and the working temperature is - 40 ° C - 550 ° C. The valve diameter is DN 15-dn 1000. Connection mode: flange, welding and clamp. Transmission mode: manual, worm gear, pneumatic, electric. Applicable media: water, oil, gas, steam, mud water, acid, etc. Manufacturing standard: national standard, American Standard and Japanese standard.
The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting. When the butterfly valve is fully opened to fully closed, it is usually less than 90 ° and the butterfly valve and butterfly rod have no self-locking ability. In order to locate the butterfly plate, worm gear reducer should be installed on the valve rod. The use of worm gear reducer can not only make the butterfly plate have self-locking ability, make the butterfly plate stop at any position, but also improve the operation performance of the valve. The industrial butterfly valve is characterized by high temperature resistance, high pressure range, large nominal diameter, carbon steel valve body and metal ring instead of rubber ring. Large high temperature butterfly valve is made of steel plate welding, which is mainly used for flue gas duct and gas pipeline with high temperature medium.
 HD Photo of electric butterfly valve
The advantages of butterfly valves are as follows:
1. Convenient and quick opening and closing, labor saving, small fluid resistance and frequent operation.
2. Simple structure, small volume and light weight.
3. The slurry can be transported, and the liquid accumulated at the pipe mouth is the least.
4. Good sealing can be achieved under low pressure.
5. Good regulation performance.
The disadvantages of butterfly valves are as follows:
1. The range of working pressure and working temperature is small.
2. Poor sealing. Butterfly valve can be divided into offset plate, vertical plate, inclined plate and lever type. According to the sealing form, it can be divided into two types: relatively sealed type and hard sealing type. The soft seal type generally adopts rubber ring seal, while the hard seal type usually adopts metal ring seal. According to the connection type, it can be divided into flange connection and clamp connection; according to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.
The installation and maintenance of butterfly valve should pay attention to the following matters:
1. During installation, the valve disc should stop at the closed position.
2. The opening position shall be determined according to the rotation angle of butterfly plate.
3. For butterfly valve with bypass valve, the bypass valve should be opened before opening.
4. The butterfly valve with large weight shall be provided with a firm foundation.
Neville butterfly valve series products have been widely used in a variety of chemical industry, liquefied gas, water supply and drainage, food, pharmaceutical, boiler steam system, mineral, paper, power generation, urban construction, municipal, and other fields, as well as residents' daily life. Fisher products sell well all over the country, high quality, efficient service, won the trust of users and extensive praise.

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