How to adjust the stroke of a spring return pneumatic actuator

Begin by preparing the workspace and ensuring the actuator is disconnected from the air supply to prevent accidental movement during adjustment. This safety step avoids potential injuries and allows for controlled manipulation of components. Inspect the actuator for any visible signs of damage or wear that might affect adjustment, addressing such issues before proceeding.

Locate the stroke adjustment mechanisms, which typically include mechanical stops or limiters on the actuator body. These components control the maximum extension and retraction points of the actuator's shaft. Loosen the locking nuts or fasteners securing these stops using appropriate tools, taking care not to damage surrounding parts.

Adjust the mechanical stops incrementally to set the desired stroke length. Move the stops closer to reduce stroke or further apart to increase it, ensuring both the extended and retracted positions align with the requirements of the connected equipment. After positioning the stops, retighten the locking nuts to secure them in place, preventing unintended movement during operation.

For pneumatic adjustment, check the positioners or control valves that regulate air flow to the actuator. These devices may feature adjustment screws or knobs that control the pressure levels governing stroke movement. Make small adjustments to these components while monitoring the actuator's movement, ensuring the stroke reaches the exact required positions.

Once mechanical and pneumatic adjustments are complete, reconnect the air supply and test the actuator's operation. Observe its movement through full cycles to verify the stroke length matches specifications. Listen for unusual noises and check for smooth operation, making fine adjustments if necessary. After confirming proper function, secure all adjustment components and document the settings for future reference.