Pressure seal cast steel gate valve describe:
Size: NPS 2"-24" 
Pressure: Class 600-2500 
Material:WCB,LCB,WC6,WC9,C12,C5,CF8,CF3,CF3M,CF8M,etc. 
Operation:gearbox,chainwheel,pneumatic,electronic,etc. 
Connection:flanged,BW,etc. 

Applicable standards:
.STEEL GATE VALVES,API 600/API 6D
.STEEL GATE VALVES,ISO 10434/ISO 24313
.FACE TO FACE,ASME B 16.10
.STEEL VALVES,ASME B 16.34
.BUTTWELDING ENDS,ASME B 16.25
.END FLANGES,ASME B 16.5
.INSPECTION AND TEST,API 598/API 6D