Ventilation butterfly Products: I. Overview: ventilation valve is widely used in ventilation and dust removal system, dust and gas, gas pipelines, air purification devices, gas pipes, etc. As with the wind flow regulator valve and the throttle valve is welded using high quality wear-resistant materials electric (hand) for the double eccentric butterfly valve flange butterfly compact, 90 ° rotary switch easy, reliable sealing and long service life, is widely used in water plants, power plants, steel mills, paper, chemicals, food and other systems for drainage, as a regulator and due to use. Second, characteristics: 1, electric (hand) butterfly valve double eccentric structure, with more and more tightly sealed off function, a reliable sealing performance. 2, sealing materials made of stainless steel and nitrile rubber with matching, long service life. 3, rubber seals can be located on the body, it can be located in butterfly board, applicable to the different characteristics of the medium, for users to choose. 4, the disc using frame structure, high strength, flow area, flow resistance. 5, electric (hand) dynamic butterfly overall paint, can effectively prevent corrosion and replace the seal seat as long as sealing materials, can be used in different media. 6, electric (hand) butterfly valve with two-way sealing function, affecting the installation from the media flow control, are not subject to spatial location can be installed in any direction. 7, (by hand) the unique butterfly valve structure, flexible operation, effort, and convenient. Third, the main parameters Nominal by DN (mm) 50 ~ 2000 50 ~ 1600 Seal Test (MPa) 0.66 1.1 1.76 Strength Test (MPa) 0.9 1.5 2.4 Temperature nitrile rubber: -40 ℃ ~ 90 ℃ Viton: -20 ℃ ~ 200 ℃ Suitable medium water, air, gas, oil and weak corrosive fluid leakage rate in line with GB / T13927-92 standard drive mode worm gear, electric, pneumatic, hydraulic four main components materials Part Name Material Body HT250? WCB? SUS304 disc? ductile nickel phosphorus ??? stainless steel valve shaft 2Cr13 ???? SUS304 304,316