¡ö Application criterion 1¡¢Design and manufacture£ºto ANSI B16.34;API602 2¡¢Size of coupling end: (1).Size of socket joint hole:to ANSI B16.11,JIS B23.6 (2).Size of threaded end :to ANSI B1.20.1:BS21:JIS BO203:S107/1 3¡¢Valve inspection and test£ºto API 598 4¡¢Structure characteristics£ºB.B;OS&Y OR W.B;OS&Y 5¡¢Material:to AIS/ASTM 6¡¢Materiare fo main body£º A105£»F5£»F11£»F22£»304£»304L£»316£»316L£»LF2.etc