... 1 manual single, double flat gate valves The Valve Series Manual single double flat gate valves SLVds -0.1 manual single, double flat gate ... ideal equipments. Second, characteristics SLVds -0.1 manual single, double flat gate simple structure, light weight, flexible operation, ... (sprocket) rotation, screw with screw nut and disc for horizontal reciprocating motion, reach the valve opening and closing ...