PLUG VALVES :: STANDARD :: VALVE OPERATIONS The DELTA PLUG range is operated through a positioning control. Our valves are manufactured for the following kind of controls: Manual through lever and position bush; Manual through reduction gear equipped with handwheel; Electric equipped with reduction gear; Pneumatic with double or simple effect; Hydraulic with double or simple effect; Stem is provided with an open/close position indicator and mechanical stop. In order to ensure a perfect functioning of the valves MMVI can directly carry out the calibration and assembling of the actuators.