... API SPEC 6A. 2.Driving mode:manual,gear drive,hydraulic 3.Gate structure:integral,expanded. PLATE GATE VALVE Feature in design :Comply ... butt welding,Driving mode:Manual,gear drive and hydraulic,Gate structure:Integral,expanded,The sealing face of gate and seat ... valve seat is classified into floating and fixed structure,Stem filler adopts lip structure with reliable seal and small operation torque. ...