Cast steel gate valve design structure and feature design and manufacture conform to API 600,API 6D and ASME B 16.34 Test and check conform to API 598 Flange ends conform to ASME B 16.5 AND ASME B 16.47A Butt-welding end conform to ASME B 16.25 Face to face dimension conform to ASME B16.10, API 600, API 6D Operation type: electrical,pneumatic,hydraulic and gear etc.