The basic manual operator for Wouter Witzel valves up to DN 200 is the 10 position spring loaded lever with notch plate which provides quick operation, economy and simplicity. When the lever is not in manual control it always returns to a latched position. It is designed to open or close the valve or to regulate the flow. The lever is also designed to serve as valve disc positioner indicator. When the lever is positioned parallel to the pipeline the valve is open.