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9. Instructions for Changing Fail Clockwise or Fail Counterclockwise
Operation of Pneumatic Actuators
1. Instruction
For normal Fail Close operation, the left side piston/rack is
positioned at the back of the housing when facing the air
nozzles and the right side piston/rack is positioned on the
near side of the housing. This will cause clockwise rotation
of the pinion when looking down on the actuator when the
springs cause the pinion to rotate and counter-clockwise
rotation of the actuator when air causes the pinion to rotate.
If it is desired to rotate the pinion counter-clockwise when
the springs cause the pinion to rotate, the locations of the
two pistons/racks should be reversed
.
This is Normal Fail Close Operation
– Note the location of the Piston Racks
Right Piston Rack is in Front
– Just Behind Air Supply Parts
This is Normal Fail Close Operation
– Note the location of the Piston Racks
Right Piston Rack is in Front
– Just Behind Air Supply Parts
For your safety and protection it is important
that the following precautions be taken prior to
working on the actuator.
1. Remove from the actuator all dust that may
cause sparks; clean periodically to prevent
dust on the actuator.
2. The installation and the maintenance of
pneumatic actuators must be assigned to
trained and qualified personnel.
3. Prior to any installation and maintenance of
the actuator, close and disconnect any kind
of power or air supply.
4. Disassembling the spring return type
actuators (springs inside) may cause severe
injuries.
