Abstract: A fluid actuator for mechanical components in general comprises at least one piston (1, 3, 31, 32) which slides inside a cylindrical chamber (100) and which, during manual operation, moves integrally with a threaded rod (9) moved between two end-of-travel positions, by means of rotation of a screw nut (10). Indicator means indicate the displacement of the threaded rod (9) between the two end-of-travel positions.

Abstract: A device for adjusting the central position of the pistons and the angular position of the pinion in a valve driving actuator comprises a tubular body in which are tightly movably arranged a first and second pistons having opposite racks, meshing with a central pinion which can turn through discrete angles. The main feature of the invention is that the inventive device further comprises limit means for limiting the stroke of the pistons toward the pinion, which means can be accessed from the outside of the tubular body.

Abstract: The invention relates to a safety device for pneumatic actuators, for preventing the actuator pinion from being violently ejected, comprising a circular seat, formed on the less diameter portion of the pinion, projecting from the actuator body, and housing a resilient ring element. The resilient ring element engages with the pinion restraining elements, provided on the less diameter portion of the pinion outside of the actuator body, for a time required for allowing the pressure inside the actuator body to be released, through a slot defined about the pinion larger diameter section because of the disengagement of the corresponding sealing gasket from the actuator body.

Abstract: The present invention relates to an angular position indicator for remotely displaying the positions of elements suitable to assume different angular positions, and, more specifically, valve elements, actuators and the like; the indicator comprises a body which can be coupled to the element the angular position thereof must be indicated or displayed, to the body being associated a display unit which is connected to the element being controlled by a device adapted to transform an angular movement into a rectilinear movement.

Abstract: The rotary actuator includes at least a precompressed spring assembly comprising a compression coil spring the ends of which are engaged by flanged cups adapted to limit the spring extension and carried slidably on a pin provided, at each end, with a circlip which prevents the cups from coming off the pin itself.