Abstract: An apparatus for actuating a valve includes a rotatable control shaft connected to the valve and a gearbox wheel is secured to the control shaft. A worm intermeshes with the gearteeth of the gearbox wheel such that when the worm is rotated, the wheel and the shaft are rotated for moving the valve between the open and the closed disposition thereof. A housing defines an enclosure for the reception therein of the gearbox wheel and the intermeshing worm. Bearings are slidably disposed within recesses so that location of the worm into intermeshing relationship with the gearteeth is facilitated. A multi-turn power drive is secured to the flange and is drivingly connected to the first extremity of the worm for rotating the worm so that the valve is controllably moved between the open and the closed disposition thereof.

Abstract: An apparatus for actuating a valve is disclosed. The apparatus includes a rotatable control shaft which has a first and a second end, the first end of the control shaft being connected to the valve such that when the shaft is rotated, the valve is moved between an open and a closed disposition thereof. A gearbox wheel has a first and a second side, the wheel being secured to the second end of the control shaft such that when the gearbox wheel rotates about a rotational axis of the control shaft, the control shaft is rotated for moving the valve between the open and the closed disposition thereof. The gearbox wheel defines a plurality of gearteeth which are disposed around a portion of a periphery of the wheel. A worm has a first and a second extremity, the worm having an axis of rotation which is disposed angularly relative to the rotational axis of the control shaft.