Design standard:API 602/BS5352 The length of the structure:length of structure of socket welding / thread end of forged steel gate valve is manufactured by factory standardThe length of structure of flange/ butt welding end of forged steel gate valve is manufactured by ASME B16.10 Flange connecting end:ASME B16.5 Butt welding connecting end:ASME B16.25 Wall thickness:API 602/ASME B16.34 Inspection and test:API 602 Pressure and temperature rating:ASME B16.34 Product scope:NPS ½″~NPS 56″,CL150~CL4500 Drive device:handle, bevel gear, electric, pneumatic, etc.