All products sold are zero profit sales, 15128740750 Please friends fast to buy 200 * 200, 250 * 250, 300 * 300, 350 * 350, 400 * 400, 500 * 500 standard model workshop stock Usually pneumatic flapper valve is pneumatic cylinders, three-piece including price granules, powder workshop spot a grain feed, traffic or transport materials and small amounts of particulate material primary control equipment is widely used in metallurgy, mining, building materials, food, chemicals and other industry control flow changes or quickly cut off. Structural features: simple structure, flexible operation, light weight, no jamming, especially applicable to all types of solid materials and 50mm around the block, lumps of material transport and traffic regulation, installation angle is not limited to, easy to operate, can be adjusted at any time scale. Carbon type manual flapper valve, reliable quality, diameter 3400 * 400 GB size, easy to install, easier to use, DN400 type manual flapper valve is widely used for the environmental protection industry to bring greater advantage. Check the manual valve screw clockwise when the handwheel stem with poor stem nut, gate slowly rises to full, otherwise open. Manual flapper valve, electric flapper valve, pneumatic flapper valve using high-quality carbon steel welded mainly applicable to iron and steel smelting, cement, chemical, thermal power plants and other enterprises have been dust for many domestic manufacturers supporting products, wholeheartedly welcome friends visit and purchase.