Mitech offers bespoke pneumatic rotary actuators for maximum reliability in moving, regulating and control applications in the industrial plant and power generation sectors. The locally designed and manufactured actuators are low maintenance instruments with either a double crank mechanism for modulating control or a scotch yoke mechanism for on/off duty.
The main shaft assembly on the double crank design is welded together, eliminating the need for it to be assembled or disassembled. The actuator is field reversible from clockwise-to-close to clockwise-to-open, allowing base mounting of the actuator, irrespective of the valve type and fail action. The actuator has a Namur mounting for switch packs or positioners on the top shaft and transfer case lid. This provides a standard bracket for all positioners and accessories with no coupling required.
Suitable for most valve types, the actuators have a pneumatic piston design with torques of up to 250 000 Nm. The choice of either a double crank or scotch yoke mechanism allows the user to select the best mechanism for optimum control and cost effectiveness. Adjustable end stops allow the end position to be externally adjusted in both open and closed position to within 7°.
Maintenance costs are reduced as the pressure seals are all simple O-rings, and the single spring design, which is pre-stressed in a detachable pack, makes the actuator easy to assemble and disassemble. The double crank design for modulating control provides high run torques, negligible backlash and low friction, while the scotch yoke design for on/off duty offers high end torques.
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