Bray 92_93 Series FLO User Manual

Page 11

All information herein is proprietary and confidential 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 and 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 move-

ment 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 en-

gagement 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 contain-

ing spring cartridges, the end cap bolts must be

tightened gradually in a diagonal sequence until the

spring cartridges are slightly compressed into their

fail position. The spring cartridges should reach the

slightly compressed 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.