... Iron, Ductile Iron, Stainless Steel, Bronze. API-Structured Worm Gear Butterfly Valve Nominal diameter: 2"~72"Applicable temperature: 150LbApplicable temperature: - ... as acid, alkali, and salt and so on.Driving mode: Gear, electric, pneumatic, Hydraulic ( function(){ var aBigImageSrc = [ ' ... oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); API 609 Standard Worm Gear Operation Butterfly Valve