... , ASME B16.10, MSS. SP-68Driving Manner: Hand wheel, worm wheel & worm screw, pneumatic driving, electric drivingButterfly ValveSingle Eccentric Butterfly ValveDesign Standard ... . SP-68Connection: Lug, Wafer, Flange, Weld ConnectionDriving Manner: Hand wheel, worm wheel & worm screw, pneumatic driving, electric driving