triple eccentric worm gear butterfly valve 1.medium:water,oil,vapour 2.DN50-DN800 ... B16.1/GB12221 Flange: GB/T9124/GB9113.1Triple Eccentric Worm Gear Driven Butterfly ValveFace to Face:ANSI B16.1/GB12221Flange: GB ... :ISO9001,ISO14001,CE,API 6D,KS,GOST HOT!! gear box double flanged grey iron manual D943H-6C/10C/16C/25 triple eccentric worm ...