1) Design: API 599 2) Face to face: ASME B 16.10 3) Flanged ends: ASME B 16.5 4) Test and inspection: API 598 5) Material: a) Body/ bonnet: TA2, Grade C3 b) Plug: TA2, Grade C3 c) Body sealing: PPL, PTFE, hard sealing 6) Pressure: 150~300lbs 7) Applicable temperature: d330C 8) Working mediums: strong oxidative and corrosive medium 9) The sizes of serial valve connecting flange can be designed according to customers' requirement