series 92/93 - Genel Makina

series 92/93 - Genel Makina
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
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
Safety Information - Definition of Terms
!
WARNING
indicates a potentially hazardous situation which, if not avoided, could result in death
or serious injury.
!
CAUTION
indicates a potentially hazardous situation which, if not avoided, may result in minor
or moderate injury.
NOTICE
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.
Qualified Personnel
A qualified person in terms of this document is one
who is familiar with the installation, commissioning
and operation of the device and who has appropriate
qualifications, 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
•
•
Is trained in first 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 qualified 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 specifically 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 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.
1
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 specific 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 butterfly 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 nonstandard actuator configuration is made in the field
or is being changed in the field. 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.
2
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 configured
Install the valve per the attached installation tag
instructions
Re-install the actuator ensuring it is in the proper
quadrant
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
Fail Open Method 1 – Mounting the Actuator
Perpendicular to the Pipeline
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
sufficient 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.
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.
!
WARNING
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
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 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.
3
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
Fail Closed Assemblies
If the actuator is attached to a valve, the butterfly valve
is shipped in the full closed position (as no air pressure
is present to compress the springs and open the disc).
Caution
Installing the valve with the disc in the full closed
position may create a compression set on the seat
causing higher than expected torques or premature
seat failure. 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 configured
• Install the valve per the attached installation tag
instructions
• Re-install the actuator ensuring it is in the
proper quadrant
Setting the Travel Stops
The final step in the installation process is to check the
travel stop settings. The travel stops are set for 90° of
travel at the factory; however, each installation is different so they should be checked before putting the valve
in service. The actuators are designed with a nominal 5°
over or under travel at each end of rotation. A screwdriver,
an open end or box end wrench and a hex wrench, of the
appropriate size, are the only tools required to make the
necessary adjustments. Refer to Figure 1 below.
!
Mounting the Actuator to the Valve
The actuator is attached to the valve by means of the
studs and nuts furnished in the mounting kit. Thread
the studs into the proper holes in the actuator, before
installing the actuator on the valve. The studs should be
snug in the bottom of the tapped holes; there is no need
to torque them. Install the actuator on the valve making
sure that the base of the actuator fits flat against the valve
mounting flange. Use the nuts and washers from the kit
to complete the installation. Torque the nuts in a diagonal
pattern to assure equal loading of the studs.
WARNING
Before setting the travel stops, 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.
Remove the black Position Indicator Pointer (23) to expose
the wrench flats on the top of the Pinion (3).
Rotate the valve to the desired position by using a
wrench on the wrench flats on the top of the Pinion (3).
Loosen the Lock Nut (12) on the Travel Stop Screw (13).
It is not necessary to remove the nut completely. Using
the hex wrench, turn the screw in or out until the desired
23
3
5°
13
12
5°
Figure 1
4
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
travel stop position is reached. While holding the screw
with the hex wrench, tighten the Lock Nut (12) with the
box end wrench.
Replace the Position Indicator Pointer (23) making
certain the pointer is aligned with the position of the
valve, open or closed.
Some valves or operating conditions require that the
actuator have more than 5° of travel adjustment. For
these conditions, the Series 92/93 actuator can be fitted
with extended travel stops in the end caps. (See page 10
for instructions on finding dimensional data) Consult
the Bray distributor in your area for this option.
Spring return actuators may be operated with only one air
supply connected to Port A, since the spring cartridges
will move the pistons when the air pressure in removed.
This operation, however, will draw the surrounding
atmosphere into the spring chambers through Port B.
NOTICE
To prevent contamination from entering the spring
chamber, actuators configured to operate with only one
air supply connected to Port A should be equipped with
a 40 micron (or finer) filter element installed in Port B.
Even better service may be obtained on spring return
actuators by installing a four-way solenoid, covering
both Port A and Port B. A four-way solenoid will fill the
spring chambers with compressed air from the plant air
supply with each stroke. The plant air supply is often
cleaner than the surrounding atmosphere, especially in
heavy industrial or chemical areas.
NOTICE
To lengthen service life, it is strongly recommended that an adequately sized filter with a 40
micron (or finer) element be installed adjacent
to the inlet of the directional control (solenoid
air) valve. Air lubricators are recommended for
rapid cycling applications (10 cycles or more
per minute.)
Routine maintenance of Series 92/93 actuators
consists primarily of maintaining the air supply
system by changing filter elements before they
start by-passing, adding oil to lubricators before
they run dry, and preventing water from entering
the air lines.
The second most common cause of shortened service
life is misalignment between the valve and the actuator. This can cause premature failure due to excessive
side loads on the bearings and gear teeth.
NOTICE
To lengthen service life, the mechanical connection between the actuator and the valve should be
verified to be properly aligned and free to rotate
throughout the full range of valve travel.
Maintenance
The rugged components and factory lubrication combine
to ensure a long and trouble-free service life for Series
92/93 actuators. Dirt, rust and water are the most common causes for shortened service life, and they typically
enter the actuator through the air supply line.
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.
5
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
Troubleshooting
Table 1 shows several common symptoms and their remedies.
Symptom
Probable Cause
Loss of Power
Low air supply pressure, or
damaged O-rings
Binding between
valve and actuator
Valve “pops” out of
seat and slams open
Misalignment of coupling
Valve torque too high, actuator sized too small, or insufficient air supply flow
Assembly
Check
Remedy
Air supply pressure at
actuator, leakage across
O-rings
Alignment
Boost air supply pressure,
repair air supply line leaks,
replace O-rings
Realign coupling
Valve torque, actuator
sizing calculations, size
of air supply lines and/
or solenoid valve
Repair valve, use proper size
actuator, use larger air supply
lines and/or solenoid valve
with higher flow
To identify component names and shapes and
for the numbers in parentheses ( ) below, refer
to the Exploded View of the actuator shown on
Figure 3, pg. 11. Easiest assembly will result from lubricating all bearings and seals as they are installed. The lubricant
should be a high pressure or extreme pressure petroleum
grease with a lithium based thickener which meets the NLGI
grade 2. Grease which meets this specification should be
available from any automotive supply store.
Travel Stop Screws (13) - Slip the o-ring (14) over the
flat end of the screw until it is 5-7 threads from the end.
Thread the screw into the hole in the body, flat end
first. Repeat these steps for the second screw. Thread
the lock nuts (12) onto the screws and tighten the nuts
against the body. This will seal the threads for testing.
It is not necessary to set the travel stops at this time, as
they may have to be reset when the actuator is installed
on the valve.
Pinion (3) - Install bearing rings (6 & 7) and o-rings (21
& 22) in their appropriate grooves. Insert the pinion
through the large hole in the center bottom of the body
(1). With the pinion part of the way into the body, slide
the cam (16) over the pinion being careful to align the
punch mark on the cam with the punch mark(s) on the
pinion. For normal installation and rotation (Fail Close),
align the single marks. For Fail Open operation described
in Method 2 on page 3, align the single mark on the cam
with the two marks on the pinion. For Fail Open operation described in Method 3 on page 3, align the single
marks. Next, install the spacer (15) above the cam. Then
insert the pinion through the hole at the top of the body
and secure it with the washer (9) and retaining ring (8).
Pistons (2) - Install the bearing pad (10) on the back
of the rack and the o-ring (19) and guide ring (11) in
their appropriate piston grooves. The o-ring goes in the
groove nearest the rack. With the ports on the actuator
body toward you, turn the pinion so that the slot is approximately 45° to the right of perpendicular with the
long side of the body. Grasp the pistons in the spring
pockets so that the piston in the right hand has the
bearing pad toward you and the piston in the left hand
has the bearing pad away from you. Slide the pistons
into the body so that they both engage the teeth on the
pinion at the same time. Apply enough steady force to
compress the o-ring into the body bore. At this point,
you may continue pushing or use a wrench on the top
of the pinion to pull the pistons into the body.
6
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.
1. The pinion must turn clockwise as the pistons
moved toward the center of the body.
2. The 4 mm slot in the top of the pinion must be
within a few degrees of perpendicular to the long
side of the body.
3. The piston faces must both be the same distance
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 on page 3.
End Caps (4) - Install the o-ring (20) in the groove.
Attach the end cap to the body with the 4 bolts (17)
and washers (18) 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 (23) - Install the position indicator
pointer on the top of the pinion and secure it with the
flat head screw (24). 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 on page 3, 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 solution 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 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.
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.
7
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
!
WARNING
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 warning on previous page) 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.
If the actuator is installed on a valve, remove the actuator
from the valve, and move the actuator to a clean work
area. Remove the indicator pointer. Remove both end
caps by loosening the hex head end cap bolts. Remove
both pistons by rotating the pinion counter-clockwise
until the piston heads are protruding from the body.
Pull the pistons out. Using snap-ring pliers, remove the
pinion retaining ring and acetal washer, then remove
the pinion from the body. The pinion bearings, o-rings,
cam and spacer may then be removed.
Adding 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.
Move the pinion to the fully closed (0°) position. Remove
the end caps and insert the desired number of spring
cartridges into the end cap pockets, up to a maximum
of six cartridges per end cap.
NOTICE
For proper operation, actuators equipped with Spring
Cartridges should have the spring cartridges installed
in accordance with the positions shown in figure 2.
Align the end cap with the body so the spring cartridges
fit into the piston pockets. Attach the end caps to the
body with the hex head end cap bolts. Tighten the bolts
gradually in a diagonal sequence.
Proceed to Final Assembly and Testing.
Figure 2
XX
2 SPRINGS
EACH PISTON
XX = SIZE CODE
XX
4 SPRINGS
EACH PISTON
8
3 SPRINGS
EACH PISTON
XX
5 SPRINGS
EACH PISTON
6 SPRINGS
EACH PISTON
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
!
CAUTION
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.
When removing end caps from an actuator containing 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.
CAUTION
Remove the spring cartridges. Replace the end caps
and tighten the end cap bolts gradually in a diagonal
sequence.
!
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 replacing end caps onto an actuator containing
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.
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.
9
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
General Pneumatic System
Recommendations
To maintain maximum efficiency with the Series 92/93
actuator, as well as many other pneumatic devices, the
following suggestions are offered:
•
Air supply lines should be run in accordance with a
Standard Piping Practice, and should not have exaggerated loops, which may trap condensate.
•
All pipe ends should be thoroughly cleaned and
deburred after cutting to ensure that the pipeline
is clear of cuttings.
•
Where air pipelines are subjected to extremes of
temperature, the system should be fitted with air
drying equipment.
•
If pipelines are hydraulically tested, the lines should
be “blown down” with high pressure air to clear all
water prior to connecting the lines to the actuator.
•
Where a system is dependent on air filter equipment,
the air filters should be in positions that allow easy
access for maintenance and/or draining.
•
Where pneumatic valve positioners or pneumatic
controllers are installed in a valve actuator assembly,
oil mist lubricated air should not be used unless the
manufacturer states specifically that the positioner
or controller is compatible with lubricated air. In
general, lubricated air is not recommended for a
positioner.
•
Where pipe fitting sealants or tapes are used, they
should be applied to the male threads only, and limited
to the first three threads. When applied to female
threads, excess compound or tape can be transmitted
into the actuator control lines and cause malfunctions
in downstream equipment.
•
Lubricators should be installed downstream of
regulators.
•
Eliminate or minimize sharp bends in the air supply lines.
10
Dimensional Data
For Dimensions see Bray ES Drawings:
ES11A-0460, ES11A-0533, ES11A-0534,
ES12A-0533 and ES12A-0534 on
www.bray.com or www.braycontrols.com
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
24
23
19
11
8
9
1
2
20
5
10
13 14
12
15
16
21
6
17 18 4
3
7
22
Figure 3: Series 92/93 exploded-view
Item No
1
2
3
4
5
6
7
8
9
10
11
12
Qty.
1
2
1
2
12 max.
1
1
1
1
2
2
2
Description
Body
Piston
Pinion
End Cap
Spring Cartridge
Upper Pinion Bearing
Lower Pinion Bearing
Retaining Ring
Washer, Acetal
Bearing Pad, Acetal
Guide Ring, Acetal
Lock Nut
Item No Qty. Description
13
14
15
16
17
18
19
20
21
22
23
24
2
2
1
1
8
8
2
2
1
1
1
1
Travel Stop Screw
O-ring, Travel Stop
Spacer, Int. Travel Stop
Cam, Internal Travel Stop
Hex Head Cap Screw
Washer, Stainless Steel
O-ring, Piston
O-ring, End Cap
O-ring, Upper Pinion
O-ring, Lower Pinion
Position Indicator Pointer
Flat Head Screw
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.
11
A Division of BRAY INTERNATIONAL, Inc.
13333 Westland East Blvd. Houston, Texas 77041
281.894.5454 FAX 281.894.9499 www.bray.com
Bray® is a registered trademark of Bray International, Inc.
© 2013 Bray International. All rights reserved. OM-92_93-001 01-2013
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