A. Pruducing standard:Design: API 6D, API 608 Or ANSI B 16.34 Or GBFace to Face: ANSI B 16.10 OR API 6DEnd flange: ANSI B16.5 B. MaterialBody Material: Cast steel (WCB A216), CF8 (SS304), CF3M(304L), CF8M (SS316), CF3M (316L) And ZG1Cr18Ni9TiSeats: PTFE, Reinforced PTFE, and hardmetal, PPL3. Medium: Water, Oil, Steam, Nitric Acid, Acetic Acid,..