232
Dixon Sanitary 2014
800.789.1718
Rack & Pinion Actuators
Rack and Pinion Actuators
Bi-Directional Travel Stop
Rack and Pinion actuators feature bi-directional pinion travel stops. Two stops located on the
side of the actuator allow a full ± 5° of valve travel adjustment, giving a
guaranteed range of adjustment between 80° and 100° of actuator travel. These travel stops
are designed to absorb the maximum rated torque of the actuator and the maximum impact
loading associated with recommended stroke speed.
Adjustment of the counterclockwise and clockwise rotation limits are accomplished by turning
the respective left and right stops adjustment screws to increase or reduce the output rotation
angle.
Double-Acting
For a clockwise output, apply
pressure to P2. This forces
the pistons to move to the
center resulting in the linear
piston travel converted to
clockwise rotation of the
pinion. The air volume
between the pistons is
exhausted at P1.
For a counter-clockwise
output, apply pressure to
P1. This forces the pistons
to move to away from the
center resulting in the linear
piston travel converted to
counter- clockwise rotation
of the pinion. The air volume
between the pistons is
exhausted at P2.
For a clockwise output, the
spring energy forces the
pistons to move to the center
resulting in the linear piston
travel converted to clockwise
rotation of the pinion. .The air
volume between the pistons
is exhausted at P1, while the
volume outside the pistons is
vented at P2.
For a counter-clockwise
output, apply pressure to P1.
This forces the pistons to
move away from the center,
compressing the spring sets
and resulting in the linear
piston travel converted to
counter-clockwise rotation of
the pinion. The air volume
outside each piston is
exhausted at P2.
Spring Return
Pneumatic Actuator Operation
Note: When reverse Rotation is required, the pistons can be inverted in the housing. This will result in a
clockwise rotation when air pressure is applied to P1 and a counter-clockwise rotation when P1 is vented.
M