Product design and scope Design standard: asme b16.34/ api 608 Length of structure: asme b16.10 Flange connecting end: asme b16.5 Butt welding connecting end: asme b16.25 Wall thickness:asme b16.34 Fireproof test:api 607/api 6fa Inspection and test: api 598 Pressure and temperature rating: asme b16.34 Product scope: nps Main body material: wcb, lcb, wcc, cf8, cf8m, cf3, c3m, a890 4a, a105, lf2, f304, f316, f304l, f316l etc. Valve seat material: ptfe, rptfe, nylon, devlon, derlin, peek, ppl or metal hard seal etc. Drive device:handle, worm wheel, electric, pneumatic etc.