Manual valve is a valve basic driving mode. It includes a hand wheel, lever or wrench two direct drive and driven through the transmission mechanism. When the valve start torque is large, it can be driven by a gear or worm gear, in order to achieve the purpose of omission. Gear sub spur gear and bevel gear drive. Gear reduction ratio, suitable for gate and globe valves, worm gear reducer relatively large for flash cocks, ball valves and butterfly valves