A pneumatic seal butterfly valve product overview can I plant the introduction of foreign advanced technology, based on the use of sophisticated J-shaped elastic ring and three eccentric multi-level metal seal structure, is widely used in medium temperature ≤425 ℃ of metallurgy, the power, petrochemical, as well as drainage and municipal construction and other industrial pipe, for regulating the flow and load off fluid use. The valve adopts three eccentric structure, seat and disc sealing surface are made of stainless steel with different hardness and has good corrosion resistance, long life, this two-way valve seal military postal functions, products, in line with national GB / T13927-92 valve pressure test standards. Second, the aerodynamic characteristics of a hard sealing butterfly valve, this valve with three eccentric seal structure, seat and disc almost no wear, with the view of the tight sealing function. 2, ring made of stainless steel production, with a metal seal and elastic sealing of the dual advantages, both in the case of low and high temperatures, all with excellent sealing performance, corrosion resistance and long service life. 3, the disc plate sealing surface using cobalt-based alloy welding, sealing surface wear resistance and long service life. 4, large-sized disc using lattice structure, high strength, flow area, flow resistance. 5, the valve has a two-way sealing function, the installation of unrestricted flow of media, is not affected by spatial location can be installed in any direction. 6, the drive can be multi-position (rotated 90 ° or 180 °) to install, easy to use. Third, the pneumatic seal butterfly valve main technical parameters Nominal by DN (mm) 50 ~ 2000 Nominal pharmacological PN (MPa) 0.6 1.0 1.6 2.5 Seal Test (MPa) 0.66 1.1 1.76 2.75 strength test (MPa) 0.9 1.5 2.4 3.75 Temperature Carbon Steel: -29 ℃ ~ 425 ℃ stainless steel: -40 ℃ ~ 650 ℃ 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 move four, pneumatic seal butterfly main parts material Part Name Material Body WCB, alloy steel, stainless steel, QT450-10 disc WCB, alloy steel, stainless steel, QT450-10 valve shaft 2Cr13 stainless steel, alloy steel ring seal packing Flexible graphite five pneumatic seal butterfly valve using standard manufacturing standard JB / T8527-97 standard GB9113-2000 flange structural length standard GB12221-89 test standard GB / T13927-92 six, D643H-10/16/25 / Pneumatic Butterfly Valve The main external connection size (unit: mm) Nominal by (DN) main dimensions flange dimensions and bolt specifications 1.0MPa 1.6MPa 2.5MPa L H1 HD D1 n-Фd D D1 n-Фd D D1 n-Фd 50 108 350 112 1651254-18165 1254-18165125 4-1865112370 115 1851454-18185 1454-18185145 8-1880114380 120 2001604-18200 1608-18200160 8-18100127420 138 2201808-18220 1808-18235190 8-22125140460 164 2502108-18250 2108-18270220 8-26150140555 1752852408-22 285 2408-22300250 8-26200152760 200 3402958-22340 29512-22360310 12-26250165830 24339535012-22 40535512-26425 37012-30300178 895 250 44540012-22460 41012-26485430 16-30350190950 28050546016-22 52047012-26555 49016-33400216 1190 30556551516-26 58052516-26 620 55016-36450222 1255 35061556520-26 64058516-30670 60020-36500229 1305 38067062020-26 71565020-30730 66020-36600267 134,044,578,072,520 -30 84077020-33845 77020-39700292 1520 48089584024-30 91084024-36960 87524-42800318 17105301015950 24-33 102595024-39 108599024-48 9003301810580 1115105028-33 1125105028-39 1185109028-48 10,004,101,960,650 1230116028-36 1255117028-42 1320121028-56 12,004,702,250,760 1455138032-39 1485139032 -48 1530142032-56