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An actuating device operated by a pressure medium, such as compressed air, acting within a housing, can be secured to a valve by a mounting member attached to the valve. The actuating device includes a first piston guided in a cylinder part positioned on one side of the center part of the housing. A

An actuating device operated by a pressure medium, such as compressed air, acting within a housing, can be secured to a valve by a mounting member attached to the valve. The actuating device includes a first piston guided in a cylinder part positioned on one side of the center part of the housing. A toothed rack is attached to the first piston and is in meshed engagement with a pinion shaft located within the center part of the housing. The pinion shaft is connected by a coupling part to the valve shaft. The same actuating device can be used for a larger valve by placing a second piston in another cylinder part on the opposite side of the center part from the first piston with a toothed rack attached to the second piston and in meshed engagement with the pinion shaft. The first and second pistons act in opposite directions and double the torque acting on the pinion shaft as compared to the torque delivered by the first piston.

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An actuating device for the remote operation of a valve, said actuating device comprising a device housing, at least one piston displaceably positioned within said device housing and being actuatable by a pressure medium for displacement in a first direction, a toothed rack connected to said piston

An actuating device for the remote operation of a valve, said actuating device comprising a device housing, at least one piston displaceably positioned within said device housing and being actuatable by a pressure medium for displacement in a first direction, a toothed rack connected to said piston for displacement therewith, a pinion shaft including a pinion located within said device housing and with said pinion disposed in meshed engagement with said rack for rotating said pinion shaft, said pinion shaft being arranged for operatively engaging the valve shaft of the valve for operating the valve, means for engagement with the valve housing, and said means forming a base for mounting said device housing on the valve housing, wherein the improvement comprises that said device housing is of a modular construction comprising a center part having a first axis and a second axis extending transversely of the first axis, said pinion shaft is located within said center part and is coaxial with said first axis, said at least one poston being displaceable within said device housing in the direction of said second axis, said device housing includes a separate cylinder part for enclosing said piston, means on said center part extending around said second axis on opposite sides of said first axis for selectively securing said cylinder part onto said center part so that one said piston can be positioned on one of said opposite sides of said center part or for selectively securing one said cylinder part one each of the opposite sides of the first axis so that one said piston and cylinder part can be positioned on each of the opposite sides of said axis with said toothed rack of each said piston being engageable with said pinion shaft for combining the displacing action of said pistons in the operation of said valve, means engageable with said at least one piston within said cylinder part for biasing said piston in the direction opposite to the first direction in which said piston is actuated by the pressure medium, said means for engagement with the valve housing, said means for engagement being selected in size in accordance with the size of the valve housing, and a coupling part for connecting said pinion shaft and the valve shaft of the valve, said coupling part being selected in size in accordance with the size of the valve shaft so that said means for engagement with the valve and said coupling part are the only components of variable size required for using said actuating device with a variety of valves, a hand actuating device interconnects said pinion shaft and the valve shaft so that the valve can be operated selectively by said actuating device or by said hand actuating device, said hand device includes a first lever secured to said pinion shaft so that said first lever rotates with said pinion shaft, and a hand lever arranged to be connected to the valve shaft so that said hand lever rotates with the shaft, and means for releasably interconnecting said first lever and said hand lever, said means for releasably interconnecting said first lever and said hand lever comprises a recess formed in said first lever, and a projection secured to an elastic element, said elastic element pivotally attached to said hand lever, said projection formed to engage within the recess in said first lever so as to provide joint movement of said first lever and said second lever, said projection arranged to be disengaged from said recess for affording actuation of the valve by said hand lever.