Bray 92_93 Series FLO - Manual (Page 9)

7 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
NOTICE
Three important parameters must be verified before
assembly may be continued.
The pinion must turn clockwise as the pistons 1.
moved toward the center of the body.
The 4 mm slot in the top of the pinion must be 2.
within a few degrees of perpendicular to the long
side of the body.
The piston faces must both be the same distance 3.
from the end of the body.
If all three parameters above have been verified, the end
caps may be installed.
If any parameter above is not verified, use a wrench on
the pinion to drive the pistons out of the body and repeat
the insertion process. It is not necessary to remove the
pistons from the body unless the answer to the first
question is no. It is only necessary to disengage the
piston rack from the pinion.
NOTICE
The assembly procedure described here is the standard
Fail Close method. For Fail Open actuators, refer to
Method 2 or Method 3 above.
End Caps (4) - Install the o-ring (17) in the groove.
Attach the end cap to the body with the 4 bolts (15)
and washers (20) making certain that the straight part
of the o-ring groove is toward the bottom of the body.
The air pressure will not flow to the outboard side of
the pistons if the straight part of the o-ring groove is
at the top.
Position Indicator (21) - Install the position indicator
pointer on the top of the pinion and secure it with the
flat head screw (22). Normally, the long axis of the
pointer will be parallel to the groove in the pinion. If
the actuator is installed across the pipe line, as described
in Method 1 above, the indicator should be turned so
that it is in line with the butterfly valve disc or port in
the ball or plug valve.
Final Assembly and Testing
CAUTION
Do not connect a compressed air supply to the actuator
that exceeds the pressure rating of the actuator (140
psig / 10 barg.)
Connect the compressed air supply to the actuator input
ports and cycle the actuator fully open and fully closed
to check for proper travel and absence of air leaks. Air
supply lines should have a minimum inside diameter
of 0.250” (6 mm). Restricted air supply lines, or any
portion of the air supply system powering the actuator
(such as solenoid air valves or valve manifolds) can
reduce actuation time, cause unexpected popping of
the valve, or even malfunction.
If compressed air is applied to Port A and the actuator
reaches the end of travel, there should be no air flow out
of Port B, and vice versa. There should be no air flow
between the end caps and the body, through the travel
stops, or out the top or the bottom of the pinion. A solu-
tion of soap and water applied to the sealing points can
indicate leaks that are too small to be audible.
Disassembly
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 con-
nected 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.
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