? Features: ① design and manufacture products meet the American National Standards ANS1B16.34, the United States and other foreign advanced standards BS1873. ? ② barrel or streamlined body shape is handsome in appearance. Circulation straight-shape. Fluid resistance. ? ③ closure member (gate valve) and seat sealing surface with cone seal, small closing force, resistance to erosion, reliable sealing. ? ④ replaceable seat for the seat, can be any combination of the pair closed sealing surface material to meet the requirements of working conditions, and prolong life. ? ⑤ large diameter, high-pressure shut-off valve closing force according to the needs of stem transmission mode using the lift rod, and with a rolling bearing type using percussive hand wheel in order to reduce the closing force. ? ⑥ main material, trim materials, packing, fastener material can be a reasonable combination of user requirements or actual working conditions. ? Standard:? The design and manufacture of structural length welded flange dimensions connection dimensions pressure and temperature rating test and inspection AP1 600 ANS1B16.10 ANS1B16.5a ANS1B16.25 ANS1B16.34 AP1598