Bray 92 Series, 93 Series Operation And Maintenance Manual
SERIES 92/93
PNEUMATIC ACTUATOR
OPERATION AND MAINTENANCE MANUAL
Table of ConTenTs
Safety Information - Definition of Terms ...................................................................................... 1
Description of Operation ..................................................................................................................... 2
Operating Medium .............................................................................................................................................. 2
Installation ........................................................................................................................................................ 2
Fail Open Assemblies ................................................................................................................................. 2
Fail Closed Assemblies.............................................................................................................................. 4
Mounting Actuator to the Valve .......................................................................................................... 4
Setting the Travel Stops ......................................................................................................................... 4
Maintenance ....................................................................................................................................................... 5
Troubleshooting ................................................................................................................................................ 6
Assembly ............................................................................................................................................................... 6
Disassembly .......................................................................................................................................................... 7
Adding Spring Cartridges ................................................................................................................................. 8
Spring Cartridge Position Illustration ................................................................................................ 8
Removing Spring Cartridges .................................................................................................................... 9
General Pneumatic System Recommendations ............................................................................................ 10
Dimensional Data .............................................................................................................................................. 10
Series 92/93 Parts Diagram .............................................................................................................................. 11
Operations and Maintenance Instructions
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safeTy InformaTIon - DefInITIon of Terms
Series 92-93 Pneumatic Actuator
WARNING
CAUTION
NOTICE
indicates a potentially hazardous situation which, if not avoided, could result in death
or serious injury.
indicates a potentially hazardous situation which, if not avoided, may result in minor
or moderate injury.
used without the safety alert symbol indicates a potential situation which, if not
avoided, may result in an undesirable result or state, including property damage.
Hazard-free use
This device left the factory in proper condition to be
safely installed and operated in a hazard-free manner. The
notes and warnings in this document must be observed
by the user if this safe condition is to be maintained and
hazard-free operation of the device assured.
Take all necessary precautions to prevent damage to
the actuator due to rough handling, impact, or improper
storage. Do not use abrasive compounds to clean the
actuator, or scrape metal surfaces with any objects.
The control systems in which the actuator is installed
must have proper safeguards to prevent injury to personnel, or damage to equipment, should failure of system
components occur.
Qualied Personnel
A qualied person in terms of this document is
who is familiar with the installation, commissioning
and operation of the device and who has appropriate
qualications, such as:
• Is trained in the operation and maintenance of
pneumatic equipment and systems in accordance
with established safety practices
• Is trained or authorized to energize, de-energize,
ground, tag and lock electrical and pneumatic circuits and equipment in accordance with established
safety practices
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• Is trained in rst aid
• In cases where the device is installed in a potentially
explosive (hazardous) location – is trained in the
operation, commissioning, operation and maintenance of equipment in hazardous locations
WARNING
The actuator must only be installed, commissioned,
operated and repaired by qualied personnel.
The device generates large mechanical force when
pressurized with air, and/or powered by springs.
The actuator stores a large amount of energy when
pressurized with air, and/or when the springs are
compressed.
To prevent injury, installation, commissioning,
operation and maintenance must be carried out
under strict observation of the safety regulations.
Reference is specically made here to observe the
applicable safety regulations for actuators installed in
potentially explosive (hazardous) locations.
Correct and safe operation of this actuator is dependent
upon proper transport, storage and installation in addition
to proper operation and maintenance.
• Is trained in the proper use and care of personal
protective equipment (PPE) in accordance with
established safety practices
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.
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Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
Description of Operation
The Bray Series 92/93 Pneumatic Actuators feature a
double piston, rack and pinion mechanism designed to
automate quarter-turn valves. In the Series 92 DoubleActing Actuator, pressure introduced through Port A
(the left port when facing the ports) forces the pistons
away from each other and causes the pinion to rotate
in a counter-clockwise direction. Pressure introduced
through Port B (the right port when facing the ports)
is directed through an internal passage to the opposite
side of the pistons, which forces the pistons together and
rotates the pinion in a clockwise direction. Normally,
the clockwise rotation (pistons moving together) closes
the attached valve, and the counter-clockwise rotation
(pistons moving apart) opens the attached valve.
In the Series 93 Spring-Return Actuators, spring cartridges
have been added to push the pistons together by spring
force in the event the compressed air pressure being lost.
This spring force normally closes the attached valve.
However, in the event that the valve is required to open
under spring force, refer to the fail open portion of the
Installation section.
Operating Medium
NOTICE
The recommended operating medium is clean, dry
industrial compressed air, 40 - 140 psig (3 - 10 bar.)
An air line lubricator is suggested for fast cycling applications, i.e. more than 10 cycles per minute. Other
media such as hydraulic oil, water, or certain other
inert gases may also be used in some instances, but the
factory should be consulted for specic applications.
Installation
Bray Series 92/93 Actuators are designed to mount
directly on the top plate of Bray Valves. Before the
actuator is mounted on a valve, it is a good practice
to lubricate the output bore of the actuator with thick
grease. The grease will make it easier to remove the
actuator from the valve stem, even after years of service.
Normally, the actuator is mounted with its long side
parallel to the pipeline*. A double acting actuator will
normally rotate the valve stem clockwise to close, and
counter-clockwise to open. Spring return actuators
will normally rotate the valve stem clockwise to close
with the spring stroke, and counter-clockwise to open
with the air stroke. The normal operation of the spring
cartridges is therefore fail closed.
Direction of operation may be changed to fail open
by any one of several different methods. Refer to the
Assembly Instructions and Exploded View in Figure 3
on page 11 for more details.
Fail Open Assemblies
If the actuator is attached to a valve, the buttery valve
disc is shipped in the full open position (as no air
pressure is present to compress the springs and close
the valve disc.) The sealing surface, or disc edge, is
therefore exposed. Damage to that surface will cause
premature seat failure.
NOTE: Consult a factory representative when a non-
standard actuator conguration is made in the eld
or is being changed in the eld. Example: Mounting
an actuator perpendicular to the pipe due to space
restrictions on site.
Operating Temperature
NOTICE
The recommended operating temperature range is -20°F
to 200°F (-29°C to 95°C). Below 32°F (0°C) care must
be taken to prevent condensed moisture from freezing in the air supply lines. Consider the use of an air
dryer if the device is installed in a cold location. The
air dryer must be capable of lowering the dew point of
the air to a temperature 36°F (20 °C) lower than that
of the surrounding environment. The air dryer must be
properly maintained and kept in operation.
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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.
CAUTION
Use caution installing the valve being careful not to
damage the disc edge. It is recommended to:
• Remove the actuator. Be sure to scribe the valve
and actuator to ensure the re-installed actuator is
in the exact same quadrant as originally congured
• Install the valve per the attached installation tag
instructions
• Re-install the actuator ensuring it is in the proper
quadrant
Fail Open Method 1 – Mounting the Actuator
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Perpendicular to the Pipeline
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
WARNING
NOTICE
Fail Open Method 1 – Mounting the Actuator Perpendicular to the Pipeline – works only with concentric
disc valves such as the Bray Series 20/21, 22/23 and
30/31 or other valves that allow the disc to be swung
through the seat.
Turn the actuator so the long side is perpendicular
to the pipeline. This will allow the spring cartridges
to rotate the valve stem clockwise to open, and the
air stroke to rotate the valve stem counter-clockwise to close. This is the easiest method if there is
sufcient room to mount the actuator.
Fail Open Method 2 – Rotating the Pinion
NOTICE
Fail Open Method 2 – Rotating the Pinion - works only
with concentric disc valves such as the Bray Series
20/21, 22/23 and 30/31 or other valves that allow the
disc to be swung through the seat.
Some actuators may have spring cartridges installed.
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 previous warning) 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.
Remove the end caps, spring cartridges and pistons
from the actuator. Remove the pinion, rotate it 90°, and
reinstall the pinion in the actuator. This will also allow
the spring cartridges to rotate the valve stem clockwise
to open, and the air stroke to rotate the valve stem
counter-clockwise to close. This is the second easiest
method, and allows the actuator to be mounted with its
long side parallel to the pipeline.
Fail Open Method 3 – Reversing the Pistons
NOTICE
See Assembly (Page 6) for detailed instructions on
reinstalling the travel stop cam on the pinion.
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.
Fail Open Method 3 – Reversing the Pistons – works
for all valves, but must be used with offset disc valves
such as the Bray Series 40/41, 42/43 and 44/45, or
other offset disc valves where the disc may only turn
clockwise to close.
See Assembly (Page 6) for detailed instructions on
reinstalling the travel stop cam on the pinion.
Remove the end caps, spring cartridges and pistons from
the actuator. Rotate the pistons so that the racks turn the
pinion counter-clockwise as the pistons move toward
each other. (With the air input ports of the actuator body
facing you, the left hand piston rack should be on the
side with the air ports.) This is the third easiest method,
and allows the actuator to be mounted with its long side
parallel to the pipeline, and clockwise to close rotation
to be maintained.
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.
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