Design standard:API 6D Length of structure:API 6D. For product beyond the scope of the standard, it shall be manufactured by specifications in BTL standard or user's requirements. Flange connecting end:ASME B16.5/ASME B16.47 Butt welding connecting end:ASME B16.25/ ASME B31.8 Wall thickness:ASME B16.34 Fireproof test:API 607/API 6FA Inspection and test:API 6D Pressure and temperature rating:ASME B16.34 Product scope:NPS 1-1/2″~NPS 60″,CL150~CL900 FKMor metal hard seal etc. Drive device:handle, worm wheel, electric, pneumatic, pneumatic- hydraulic, electro-hydraulic, etc.