Specifications: 1)Production enforce standard Design & Manufacture Std.: API 6D API608 Face to Face Std.: ANSI B16. 10 API 6D Flange dimensions: ANSI B16. 5 Butt welding dimension: ANSI B16. 25 Pressure temperature lating: ANSI B16. 34 Inspection and test:API 598 API 6D Marking:MSS SP-25 API 6D Supply: API 6D API608 2)Major parameter Size: 1/2"-10" pound class: 150Lb--600Lb Body Cover Ball: WCB LCB CF8 CF3 CF3M CF8M Operated Way:: Lever, Gear, Pneumatic, Electric Structure Type: Two-Piece ,Three-Piece Anti-static construction "AS" and fire-resistant construction "FD"