1 – Hard Anodized Barrel / Body to Protect from Hazardous atmosphere & corrosion, which enhances the life of the actuator.
2 – Mounting Standard Pinion Top (As Per Namur Standard) The pinion (shaft) top drilled and slotted for easy assembling of switch, positioners and other accessories.
3 – Adjusting Bolt Adjusting Bolts for 0° – 90° ± 5% Over Travel.
4 – ISO – 5211 Standard Mounting for Valve (An International Standard) Double bottom drilling for the actuator to valve Assembling & centering. Designed for strength and easy mounting or interchangeability.
5 – ISO – 5211 Standard Pinion Bottom (An International Standard) Bottom of the pinion (Shaft) a female key, double square-hole for assembling on valves with square key stem and in line or turned to 45°. Designed for strength and sure-fix with stem.
6 – Sliding Skates The innovation for replaceable sliding skates, between Pistons (Racks) and ithe nternal bore surface of the Actuator, just to avoid metal contact, which enhances the Actuator's life.
7 – Compact Design “aira” Actuators are designed as compact double acting which offer high torque values. Internal sliding surface, machined and anodized for minimum friction and long life of the actuator.
This pneumatic double-acting actuator requires normal air pressure from 4Kg/cm² (alt+0178 for ²) to a maximum 8Kg/cm² air supply. With this air supply, it can generate up to 13673 NM torque.
Mechanism of Double Acting Pneumatic Actuator
With the help of piston-connected racks, the center rod-connected pinion rotates on its axis. When the pressurized air enters the chamber from port – 1, the piston pushes forward and the connected rack rotates the central pinion. To get the earlier position, pneumatic air enters from port -2 and pushes back the piston to its earliest position. Hence the piston-connected rack moves backward and also rotates the pinion. In rack & pinion transmitted double acting pneumatic actuators do not use springs like single-acting pneumatic actuators. The double-acting actuators required air supply twice to complete one cycle. As a result, these actuators provide full control over the connected valve.
Uses of Double Acting Actuator
The Double Acting Pneumatic Actuators provide 90° and 180° Rotation. These actuators are very friendly and widely used to operate quarter-turn valves. Where huge pressure is required to open or close the flow line for a long time, these actuators are ideal for that. To control flammable gas pipelines or refineries remotely, these actuators are the best fit as they provide spark-free transmission.
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