Standards:
Design and Manufacture:Cast steel gate valve to API 600 (ISO10434) or API 6D,cast stainless 
                      steel gate valveto API 603 or API 600;forged steel gate valve to API 602.
                      
Inspection and Test:ASME B16.5(for NPS¡Ü24);ASME B16.47 series B,API 605 or ASME B16.47 
                             series A,MSS SP44(for NPS>24).
End flange dimension:API 598,API 600 or API 6D
BW end dimension:ASME B 16.25