Product Overview Product description: The valve shut-off valve for use; for water supply and drainage, power generation, oil, gas (natural gas), chemical industry, metallurgy, food (beverages), pharmaceutical, paper, shipbuilding, environmental protection and other projects in the transport system each kind of corrosive, non-corrosive fluids piping and containers for flow regulation and cut off the media. Features cast steel butterfly Its main features are: 1) design, reasonable, unique structure, light weight, open and close quickly. 2) operating torque is small, easy to operate, saving smart. 3) can be mounted in any position, and easy maintenance. 4) seals can be replaced, reliable sealing performance reaches two-way seal zero leakage. 5) sealing material aging, weak corrosion, long service life. 6) Design Standard: GB / T2238-1989 7) flange size: GB / T9113.1-2000; GB / T9115.1-2000; JB78 8) length of the structure: GB / T12221-1989 9) Pressure test: GB / T13927-1992; JB / T9092-1999