Flanged ball valve with acid, alkali, corrosion-resistant features, and has a high mechanical strength, and in line with national drinking water health standards. Suitable medium: water, oil, gas and some corrosive liquids three flange ball valve, three-piece ball valves, flanged ball valves, depending on the material temperature -14 ℃ ~ 100 ℃, -40 ℃ ~ 140 ℃. Connection: internal thread, external thread, flange, welding, butt welding, socket welding, card sets, clamps. Drive mode: manual, pneumatic, hydraulic, electric. When flanged ball valve with both ends flanged pipe connections, the method is to tighten the bolts evenly to prevent leakage caused by deformation of the flange. If the handle clockwise to off, otherwise it is open. Working temperature: -196 ℃ -650 ℃.