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All information herein is proprietary and condential and may not be copied or reproduced without the expressed written consent of BRAY INTERNATIONAL, Inc.
The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application.
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
Removing Spring Cartridges
WARNING
Before disassembly of the actuator, the pneumatic
air supply must be completely disconnected from
the actuator, and all compressed air stored within the
actuator must be released. Auxiliary devices connected
to the actuator, such as tubing, ball valves, solenoid
air valves, valve positioners, etc. can block the release
of air from within the actuator. Do not rely upon the
features or controls of any auxiliary device to release
the air from inside the actuator to render it safe for
disassembly.
CAUTION
Before disassembly, all spring cartridges must be
placed into the relaxed (fully extended) position.
All compressed air must be removed from inside the
actuator (See warning above) and the actuator pinion
must be allowed to rotate so the springs may be relaxed.
Care must be taken to verify that any device connected
to the actuator, such as a valve mounted underneath,
is not preventing the movement of the springs to the
relaxed position.
An actuator with spring cartridges installed and no
compressed air connected will move to the spring fail
position if the pinion is free to rotate. This may be
either fully closed (0°) or fully open (90°). In either
case, when the spring fail position is reached, remove
the end caps by gradually loosening the hex head end
cap bolts in a diagonal sequence.
CAUTION
When removing end caps from an actuator con-
taining spring cartridges, the end cap bolts must
be loosened gradually in a diagonal sequence until
the spring cartridges are completely relaxed (fully
extended.) The spring cartridges should reach the
completely relaxed (fully extended) position
while all four end cap bolts still have some thread
engagement with the actuator body. Do not remove
three end cap bolts completely from the body and
expect the remaining single bolt to hold the spring
cartridges in a compressed position.
Remove the spring cartridges. Replace the end caps
and tighten the end cap bolts gradually in a diagonal
sequence.
CAUTION
When replacing end caps onto an actuator containing
spring cartridges, the end cap bolts must be tightened
gradually in a diagonal sequence until the spring car-
tridges are slightly compressed into their fail position.
The spring cartridges should reach the slightly com-
pressed fail position while all four end cap bolts have
some thread engagement with the actuator body. Do
not attempt to tighten a single end cap bolt fully and
compress the spring cartridges while the other three
bolts have not been installed.
Proceed to Final Assembly and Testing.
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