Flange Expansion Butterfly Valve

Features： 1、 Reasonable in design, compact in construction, easy to install and maintain. 2、 The double eccentric structure friction of the sealing ring, providing the valve a long service life. 3、 Bubble-tight sealing with no leakage under testing pressure. 4、 Replacing materials of the disc sealing ring and disc, the valve can be used for various medium and temperature. Usage： This product is ideal for throttling or shutting off the flow of corrosive or Incorrosive gases, liquids, semi-liquids and solid powder, and can be installed in any Selected position in pipelines or on vessels in the industries of petroleum processing,Chemicals, food, medicine, textile, paper making, hydroelectricity engineering ship building, water supply and sewage, metallurgy energy engineering as well as light industry, etc. size α H1 H2 H3 L Lmax Lmin n- Bolt mm inch 100 4″ 45° 180 114 200 32 229 250 208 8-18 8-M16?70 8-M16?50 125 5″ 45° 210 127 213 32 254 276 232 8-18 8-M20?70 8-M20?50 150 6″ 45° 240 140 225 32 267 293 241 8-22 8-M20?75 8-M20?50 200 8″ 45° 295 197 260 45 292 317 267 8-22 8-M20?85 8-M20?65 250 10″ 30° 350 203 292 45 330 356 304 12-22 12-M20?100 12-M20?60 300 12″ 30° 400 242 337 45 356 382 330 12-22 12-M20?100 12-M20?70 350 14″ 22.5° 460 267 368 45 381 408 355 16-22 16-M20?110 16-M20?80 400 16″ 22.5° 515 299 400 51 406 435 377 16-26 16-M24?110 16-M24?90 450 18″ 18° 565 318 422 51 406 435 377 20-26 20-M24?110 16-M24?110 4-M24?60 500 20″ 18° 620 349 479 64 457 490 424 20-26 20-M24?120 16-M24?120 4-M24?70 600 24″ 18° 725 410 562 70.5 508 543 473 20-30 20-M27?125 16-M27?125 4-M27?80