... SLVds -0.1 manual single, double flat gate valves are widely used in building material, metallurgy ... , characteristics SLVds -0.1 manual single, double flat gate simple structure, light weight, flexible operation, raplace singly ... middlings SLVds -0.1 manual single, double flat gate mainly by the framework, screw nut, the handwheel ... , model establishment instructions Five, the main property parameter