... SPEC 6A. 2.Driving mode:manual,gear drive,hydraulic 3.Gate structure:integral,expanded. PLATE GATE VALVE Feature in design :Comply ... connection type:Flange,thread,collar and butt welding,Driving mode:Manual,gear drive and hydraulic,Gate structure:Integral,expanded,The ... with hard alloy with erosion and corrosion resistance,The valve seat is classified into floating and fixed structure,Stem filler ...