Double acting and spring return actuators have different operating and loss-of-air behaviour. The actuator, coupling, valve stem, mounting bracket and accessories must be checked as an assembly. A body size alone does not confirm suitability for a valve.
Technical selection
Valve duty
Valve type and size, service medium, operating conditions and required opening and closing torque.
Actuator
Double acting or spring return, rotation angle, direction and fail position.
Air supply
Minimum available pressure at the actuator, air quality and operating cycle.
Mechanical interface
Valve stem, coupling, bracket, mounting pattern and alignment.
Accessories
Solenoid valve, position indication, limit switches, speed control or positioner as required.
Installation & maintenance
Check mechanical alignment and valve movement before final commissioning.
Verify end positions, feedback and the agreed response to loss of air or control power.
Inspect air leakage, fasteners and the condition of accessories during maintenance.
Equipment photographs
Actuator and coupled valve assemblyRotary actuators in different body sizesEnd cover and position indicatorAir connections and adjustment screwsActuator housing and assemblyNameplate and close-up of the housing
Technical drawings and output torque
Open a drawing at full size to check the model code and units. Confirm the final mounting dimensions and torque data against the proposed actuator and the minimum available air pressure.
Exploded view of the actuator componentsMounting dimensions and model sizesDouble-acting output torque at different air pressures
Send the application, operating conditions, dimensions and available drawings or photographs. State any information that is still unknown so the technical review can address it.
