MAINTENANCE & OPERATING
INSTRUCTIONS
BRADFORD ACTUATOR OPERATION
NOTE: For optimal operation, BRADFORD actuators should be run with a supply
of clean, lubricated air.
SPRING RETURN ACTUATORS
Air to PORT P1 (the right hand port) causes the actuator to turn CC
W. Loss of air
to PORT P2 causes air to exhaust and the actuator turns CW. This is the FAIL
CLOSE operation.
DOUBLE ACTING ACTUATORS
Air to PORT P1 (the right hand port) causes the actuator to turn CCW. Air to
PORT P2 (the left hand port) causes the actuator to turn CW.
ADJUSTING OPEN AND CLOSED STOPS
BRADFORD actuators allow for ± 10˚ adjustment in both the open and closed
positions. The stop adjustment bolts are located abov
e the air ports (22 & 23).
The right hand bolt allows for adjustment in the closed position; the left hand bolt
allows for adjustment in the open position. A clockwise turn of the left bolt results
in clockwise movement of the pinion; a counterclockwise turn of the bolt results in
counterclockwise movement of the pinion. Loosen nut #23 and adjust screw
#22. Re-tighten nut after adjustment to secure position.
DISASSEMBLING STANDARD ACTUATORS
IMPORTANT: Before beginning disassembly, ensure that the air supply to the
actuator has been disconnected, all accessories have been removed and that the
actuator has been dismounted from the valve.
1. Loosen the end cap fasteners (8) with a wrench (size varies depending on
actuator model). On the spring re
turn actuator, alternate 3 to 5 turns on
each fastener until the springs are completely decompressed. Use caution
in removing the cap since the springs are under load until the fasteners
are fully extended. Remove #7 washers and #8 screws. Remove #6
cover.
2. Remove #5 and #24 O-rings. Repeat steps for other side cover #6. The
indica
tor (12) may now be removed. Loosen #23 nuts and #22 screws.
3. Turn the pinion shaft (17) CCW until the pistons are at the full end of
travel. Dis
engage the pistons (2) from the pinion. (NOTE: Low pressure
