Linear and rotary pneumatic actuators
November 2004
Valves, Actuators & Pump Control
SMC's standard type linear positioner, series IP200, is suitable for remote positioning or stroke regulation of dose units, pumps, gears, drives, velocities, proportional apertures of valves and many other applications. The smoothness of movement of these cylinders, in combination with the positioner system, leads to precise positioning. Hysteresis is less than 1% of the total cylinder capacity. The 20 to 100 kPa signal pressure acts directly on the servo positioning system in such a way that a modification or change in this pressure is transformed immediately into a movement of the piston. Zero point and span adjustment is easy and simple. Standard strokes are available up to a maximum of 500 mm. A special option of Viton seals is also available for operation at elevated temperatures.
Where the linear positioner may be exposed to excessive vibration, causing 'hunting', SMC offer the solution of a rotary positioner fitted with a linear cam. This positioner has the advantage of being fitted with the electro-pneumatic regulator within the unit. It comes mounted on SMC cylinders with diameters ranging from 40 up to 300 mm and strokes up to a maximum of 700 mm. The rotary positioners may either be pneumatically or electrically controlled and have the option of lever or rotary cam type.
Where a failsafe system is required, the unit can be fitted with the necessary components to cause the actuator to stroke open or closed if air pressure drops, electrical power fails or the signal is lost.
All of SMC's pneumatic positioners can be controlled manually, locally or remotely, through its range of precision regulators or electrically through SMC I/P or E/P regulators. The electro-positioners are available as a range featuring different input signal options.
For more information contact Hyflo SA, 011 386 5800, [email protected], www.hyflo.co.za
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