1) China pressure-temperature rating standard
"Steel Valves - General Requirements" GB/T 12224
"Steel Pipe Flange Technical Conditions" GB/T 9124
"Power Station Valves - General Requirements" JB/T 3595
2) Common foreign pressure-temperature rating standards
ASME B 16.34 "Flanged, threaded and welded valves"
ASME B 16.5 "Pipe Flanges and Flange Fittings"
ASME B 16.1 "Gray Iron Pipe Flanges and Flange Fittings"
ASME B 16.24 "Cast Copper Alloy Pipe Flanges and Flange Fittings"
ASME B 1642 "Ductile Iron Pipe Flanges and Flange Fittings"
EN 1092 "Circular flanges for PN numbered pipe fittings, valves and accessories Part 1 Steel flanges"
IS0 7005-1 "Metal Flanges Part 1 Steel Flanges"
