The Compact II pneumatic quarter turn actuator, supplied by Dupleix Liquid Meters (DLM), has been developed to be simple, reliable, and efficient using a patented rack and pinion design. Four separate racks, each with its own piston, develop torque around the centrally located pinion.
This four-piston design permits air pressure to be applied to four racks simultaneously, significantly increasing torque, and thus reducing the actuator's overall size compared to single and double piston designs. Symmetrically spaced at 90° angles around the central pinion, the Compact's four piston/racks also achieve a more uniform load distribution than do single and double rack actuators, greatly reducing gear wear at the points of contact between rack and pinion.
A look at the operation of the Compact actuator reveals several other important advantages of its symmetrical four piston design, including a trouble-free high cycle life, minimum air consumption, energy efficiency, fast response, and of course, a compact size.
The devices are corrosion resistant, with anodised coating of the body, covers and stop providing protection internally and externally. A two-layer external polyurethane paint coating provides protection against aggressive environments. The stop design allows rotational adjustment in both directions of actuator travel. A safe guard ensures secure operation, assembly and disassembly of the actuator.
Compact's superiority over single and double rack designs is achieved through distribution of the total torque equally among its four piston and racks, so that each rack needs to contribute less torque. At a given air pressure, Compact can produce the same torque output using smaller diameter pistons and a narrower pinion. Four small cylinders, each located on one side of a cube, results in a compact, space saving shape. Four pistons result in a shorter piston travel, which makes the Compact fast acting.
Compact's cube shape and short piston travel minimise dead space. Dead space is space not swept by piston travel that must be pressurised before piston motion begins. This is pressurised air that does no work but nonetheless requires energy to maintain pressure. Compact's minimum dead space geometry means minimum air consumption, which in turn means maximum energy efficient, since little pressurised air goes to waste.
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