Butterfly valve instruction Metal hard seal welded butterfly valve Wafer butterfly valve Flange butterfly valve Welded butterfly valve Hard seal butterfly valve Soft seal butterfly valve Fluorine butterfly valve Rubber lined butterfly valve Stainless steel butterfly valve Carbon steel butterfly valve Cast steel butterfly valve Brass butterfly valve Regulating butterfly valve Eccentric butterfly valve Ventilation butterfly valve Signal butterfly valve Manual butterfly valve Worm wheel butterfly valve Pneumatic butterfly valve Electric butterfly valve Vacuum butterfly valve Plastic butterfly valve Standard butterfly valve Japanese standard butterfly valve German standard butterfly valve Middle line butterfly valve Eccentric butterfly valve High temperature butterfly valve Lining butterfly valve High performance butterfly valve Large diameter butterfly valve Hydraulic control butterfly valve Check butterfly valve Rubber butterfly valve Quick closing butterfly valve Clamp butterfly valve Gas butterfly valve High pressure butterfly valve Heavy hammer butterfly valve Automatic butterfly valve Switch butterfly valve Quick opening butterfly valve Elastic hard sealing butterfly valve Multilayer hard sealing butterfly valve Stainless steel hard sealing butterfly valve Valve PTFE sealing butterfly valve anti condensation butterfly valve lug type butterfly valve pipe network type flange butterfly valve flap type sealing butterfly valve welded hard sealing butterfly valve extension rod wafer type butterfly valve extension rod flange butterfly valve imported from Japan butterfly valve imported from the United States butterfly valve imported from Germany butterfly valve imported from Britain butterfly valve imported from France butterfly valve high vacuum butterfly valve pneumatic high vacuum butterfly valve electric high vacuum butterfly valve butterfly valve refers to the closing part (Valve disc or butterfly plate) is a kind of valve that rotates around the valve shaft to open and close. It is mainly used for cutting off and throttling in the pipeline.
Neville valve butterfly valve series products: imported butterfly valve, butterfly valve imported from Germany, butterfly valve imported from Britain, butterfly valve imported from Japan, butterfly valve imported from the United States. Wafer butterfly valve, butt welding butterfly valve, flange butterfly valve. Pneumatic butterfly valve, pneumatic vacuum butterfly valve, pneumatic flange butterfly valve D643, D641, pneumatic wafer butterfly valve D671, D673, pneumatic soft seal butterfly valve D671, D672, D641, pneumatic hard seal butterfly valve D673H, D643H, D663H, electric butterfly valve, electric wafer 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 D963H。 Manual butterfly valves D71, D73, D41, D43, D63, worm gear butterfly valves D373, 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, SD341X. Lug type butterfly valve LTD371X. Signal butterfly valve WBSX (XD371X). Rubber lined butterfly valve D371J. Fluorine lined butterfly valve D341F, semi 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 blade butterfly valve DBD-0.5. Electric regulating butterfly valve ZAJW-0.6. 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, midline butterfly valve. Non pin butterfly valve, sanitary butterfly valve and other series products
Structure diagram of imported butterfly valve butterfly valve butterfly valve 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 diagram of butterfly valve Valve body material: cast iron, cast steel, stainless steel, chrome molybdenum steel, aluminum alloy, brass, sealing surface material: H, J, F46, Y, W. Working pressure 0.6-10MPA, working temperature - 40 ° C - 550 ° C. Valve diameter DN15-DN1000. Connection mode: flange, welding and clamp. Transmission mode: manual, worm gear, pneumatic, electric. Applicable media: water, oil, gas, steam, mud water, acids, etc. Manufacturing standards: (flange standard configured) 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 to achieve the purpose of opening and closing or adjustment. The butterfly valve is generally less than 90 ° from full opening to full closing, and the butterfly valve and butterfly stem have no self-locking capacity. In order to position the butterfly plate, a worm gear reducer should be installed on the valve stem. 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 operating performance of the valve. Special industrial butterfly valve is characterized by high temperature resistance, high applicable pressure range, large nominal diameter of valve, carbon steel valve body, and metal ring instead of rubber ring for sealing ring of valve plate. The large high-temperature butterfly valve is welded with steel plate and is mainly used for the flue and gas ducts of high-temperature media.
The advantages of butterfly valve are as follows:
1. It is convenient and quick to open and close, labor-saving, small fluid resistance, and can be operated frequently.
2. Simple structure, small size and light weight.
3. The mud 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 adjustment performance.
The disadvantages of butterfly valve are as follows:
1. The operating pressure and temperature range are small.
2. Poor sealing. Butterfly valves can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure. According to the sealing form, it can be divided into two types: relatively sealed type and hard sealed type. The soft seal type generally adopts rubber ring seal, and the hard seal type usually adopts metal ring seal. According to the connection type, it can be divided into flange connection and wafer 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 shall pay attention to the following matters:
1. During installation, the valve disc shall be stopped at the closed position.
2. The opening position shall be determined according to the rotation angle of the butterfly plate.
3. For butterfly valve with bypass valve, the bypass valve shall be opened before opening.
4. The butterfly valve with large weight shall be provided with a firm foundation.
Niwei butterfly valve series products have been widely used in various fields such as chemical industry, liquefied gas, water supply and drainage, food, pharmacy, boiler steam system, minerals, paper making, power generation, urban construction, municipal administration, and daily life of residents. Fischer's products sell well all over the country. With high quality and efficient service, they have won the trust and widespread praise of users.
