1) Design: API 6D 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: TA2, Grade C3 b) Bonnet: TA2, Grade C3 c) Seat: TA2, Grade C3 6) Pressure: 150 ~ 600lbs 7) Applicable temperature: d425C 8) Working mediums: strong oxidative and corrosive medium 9) The sizes of serial valve connecting flange can be designed according to customers' requirement