Pneumatic rotary actuators
May 2013
Valves, Actuators & Pump Control
PSV Mitech’s range of pneumatic rotary actuators is custom designed to suit applications in the power generation, petrochemical, mining, breweries, pulp and paper, and iron and steel industries. The instruments are low maintenance and are available with either a double crank mechanism for modulating control or a scotch yoke mechanism for on/off duty. The double crank provides high run torques, negligible backlash and low friction, while the scotch yoke design has the advantage of high end torques.
The actuators are field reversible from clockwise-to-close to clockwise-to-open. A Namur mounting for switch packs or positioners is provided on the top shaft and transfer case lid. With their pneumatic piston design, the actuators are offered in large sizes and can be engineered and fitted to most valves up to a 250 000 Nm torque.
By utilising a square drive, the actuators can be mounted perpendicular to or in line with the pipe work, and the adjustable end stops can be externally adjusted in both the open and closed position to within 7°. The single spring, which is pre-stressed in a detachable pack, makes the actuator easy to assemble and disassemble. Pressure seals are all simple O-rings, which reduce maintenance costs.
For more information contact Greg Walker, PSV Mitech Control Valves, +27 (0)11 657 6000, [email protected], www.mitech.co.za
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