The COMPACT pneumatic quarter turn actuator 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 rack design permits air pressure to be applied to four pistons simultaneously, significantly reducing piston diameter, and the actuator's overall size, compared to single and double rack designs. Symmetrically spaced at 90 degree around the central pinion, the COMPACT'S four 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 symmetric four rack design, including a trouble-free high cycle life, minimum air consumption, energy efficient, fast corresponding and of course, a compact shape.

• Efficient: Patented 4-pistons give maximum torque for minimum air consumption.
• Long Life: The unique balanced piston design and shorter stroke prevents uneven wear of gear and pistons.

a) Anodized coating of body, covers and stop provides protection internally and externally.

b) A two layer external polyurethane paint coating provides protection against aggressive environments.

COMPACT'S superiority over single and double rack designs is achieved through distribution of the total torque equally among its four racks so that racks generates less torque. At a given air pressure, COMPACT can produce the same torque output using smaller diameter pistons and a narrower pinion. Four small cylinder, each located on one side of a cube, permit a compact, space saving shape.

A narrower pinion results in a shorter piston travel which makes the COMPACT fast acting.

COMPACT'S cube shape and short piston travel minimize dead space. Dead space is space not swept by piston travel that must be pressurized before piston motion begins. This is pressurized 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 efficiency, since little pressurized air goes to waste.

For use in extremely corrosive environments, HABONIM-VAAS can supply the actuator with a stainless steel dome cover. The Compact actuator can be easily fitted with a round  dome  due to its symmetrical shape, unlike   conventional two-piston actuators. The dome cover can  also  house accessories    such    as    solenoid valve  and  limit switches,  making  it possible  to  use  basic  switches  and solenoid valves without separate weather-proof enclosures. The dome has been  tested  and  is rated to weather-proof to IP65.