Emerson Bettis RGS F Series User manual

Installation, Operation and Maintenance Manual
RGS011110-2 Rev. 0
April 2016
Bettis RGS F-Series Double-Acting Actuators

Installation, Operation and Maintenance Manual
RGS011110-2 Rev. 0
Table of Contents
April 2016
I
Table of Contents
Table of Contents
Section 1: Overviewn �����������������������������������������������������������1
Section 2: Installation �����������������������������������������������������������2
2.1 Valve Attachment ....................................................................................... 3
2.2 Accessory Mounting ................................................................................... 4
2.3 Piping and Operation.................................................................................. 4
2.4 Travel Adjustment....................................................................................... 7
Section 3: Troubleshooting ��������������������������������������������������9
Section 4: Maintenance ������������������������������������������������������10
4.1 Periodic Maintenance Schedule ................................................................ 10
4.2 Lubrication................................................................................................ 10
4.3 Piston Seal Replacement........................................................................... 10
4.4 Rod Seal Replacement .............................................................................. 13
4.5 Yoke Seal and Bushing Replacement......................................................... 15
4.6 Pins and Rollers Replacement ................................................................... 19
Appendix A: ������������������������������������������������������������������������21
A.1 Force Module ............................................................................................ 21
A.2 Torque Module .......................................................................................... 23

April 2016
Installation, Operation and Maintenance Manual
RGS011110-2 Rev. 0
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Section 1: Overview
Overview
Section 1: Overview
NOTE:
All activities must be carried out in order to ensure proper actuator operation. Always
read all instructions before beginning maintenance.
Bettis RGS F-Series actuators are composed of three basic sub-assemblies, two force
modules and a torque module. The force modules contain the pistons which provide
linear motion. The torque module contains the yoke which converts the force modules’
linear motion into torque and operates the valve.
Every actuator assembled by Bettis is tested prior to shipment to our customers.
Order specific documentation may be available upon request.

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Section 2: Installation
Installation
Section 2: Installation
Bettis actuators may be mounted in any position/orientation. If necessary, lift the actuator
with straps placed inside the framework of the body. Never lift the actuator by the cylinders,
tie rods, or travel stops. Lifting the actuator with the valve attached is not generally
recommended.
Figure 1

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Section 2: Installation
Installation
Larger sizes have lifting eyes incorporated into their body section which may be used to
lift the actuator.
Figure 2
2�1 Valve Attachment
NOTE:
Prior to mounting the actuator, verify alignment of coupler and shaft to ensure that the
valve will move to correct position.
Ensure the actuator is in the same position as the valve. It may be necessary to stroke
the actuator to determine the correct mounting orientation. Attach the actuator to the
valve using the proper bracket and coupler, or with a Bettis Universal Mounting Plate
(UMP) if provided. Using all mounting holes indicated on Bettis dimensional drawings,
tighten all fasteners hand tight then torque the fasteners to the corresponding value on
the table below.
Table 1�
Thread Pattern Ft-Lbs Nm
Accessories M5 3.4 4.6
F2200 M12 49 66
F2250/2300 M16 120 162
F2375 M20 235 318
F2488 M24 400 543
F2575 M30 800 1084

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Section 2: Installation
Installation
2�2 Accessory Mounting
As a standard, Bettis RGS F-Series actuators are provided with female 4mm slotted accessory
mounting geometry. When installing accessories, such as switch boxes or positioners,
tighten accessory mounting bolts hand tight, stroke the actuator three times to ensure
proper alignment then tighten the accessory mounting bolts to the proper torque. Check
the dimensional drawing or associated product bulletin for exact dimensions.
2�3 Piping and Operation
The operation of a Bettis RGS F-Series Double-Acting (DA) actuator is comparable to any
double-acting scotch yoke actuator.
Instrument air, water, and other power gases and fluids may be used to cycle the actuator so
long as construction materials were chosen accordingly and maximum allowable pressure is
not exceeded. Air driven stainless-steel actuators with stainless-steel or composite cylinders
are not harmed by wet air (so long as freezing does not occur). Aluminum and chrome-
plated steel cylinders may be harmed over time by the presence of water.
WARNING: DO NOT EXCEED PRESSURE RATING
Exceeding the stated maximum pressure may result in damage to equipment and danger
to personnel including severe injury or death. Consult the actuator label for operating
limits. If an actuator label is missing, contact Bettis to request a replacement.
WARNING: DO NOT EXCEED TEMPERATURE RATING
Operating outside of the minimum and maximum temperature range may result in damage
to equipment and danger to personnel including severe injury or death. Consult the
actuator label for operating limits. If an actuator label is missing, contact Bettis to request a
replacement. An example of an actuator label is provided below for your reference.
NOTE:
CE marking indicates product conforms to the requirements of applicable directives as
listed on the actuator label.

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Section 2: Installation
Installation
All Bettis actuators are shipped in the Left-Hand orientation unless ordered as Right-
Hand. The orientation may be reversed in the field by moving all accessories to the
opposite side of the shaft and turning the actuator top–side down.
Double-Acting (Left-Hand): pressure on the end cap ports pushes the pistons inward
and causes counterclockwise rotation. Pressure to the base plate ports pushes the
pistons outward resulting in a clockwise rotation.
Double-Acting (Right-Hand): pressure on the end cap ports pushes the pistons inward
and causes clockwise rotation. Pressure to the base plate ports pushes the pistons
outward resulting in a counterclockwise rotation.
Figure 3
Left-Hand
Right-Hand

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Section 2: Installation
Installation
Piping Guidelines:
• Both end cap pressure ports (P1 and P2) and both base plate pressure ports
(P3 and P4) must be utilized for proper operation.
• P1 and P2 are typically connected and powered by a single air pathway.
• P3 and P4 are typically connected and powered by a single air pathway.
• P5 is a breather port that should be fitted with a filter or strainer.
• On double-acting models, P5 may also be plugged without affecting
actuator operation.
Figure 4
P1
P3
P4
P2
P1
P3
P4
P2
P5 (2)
P5 (2)

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Section 2: Installation
Installation
2�4 Travel Adjustment
The following instructions are for Left-Hand orientated actuators. For non-standard
models, clockwise and counterclockwise motion will be the inverse of what is
described below. Check the actuator model and orientation before adjusting the
Travel Stops.
Figure 5
Travel Stop
A-1
Travel Stops
B-1(x2)
Travel Stops
B-2 (x2)
Travel Stop
A-2
Set Clockwise Rotation (Travel Stops A)
1. Relieve all pressure from the actuator.
2. Loosen the Travel Stop nuts on Travel Stops A-1 and A-2. Be careful not to
misplace the travel stop O-rings.
3. Ensure actuator lockout (if provided) is disengaged.
4. Apply pressure to P3 and P4 to force the pistons fully outward, then relieve
all pressure.
5. Unthread Travel Stop A-2 four to five full turns.*
6. Adjust Travel Stop A-1 until travel is set to the desired position. It may be
necessary to apply pressure to P3 and P4 between adjustments to determine
final position
of travel.
7. Apply pressure to P3 and P4 and thread Travel Stop A-2 in until it is in firm
contact with the piston.
8. With pressure still applied to P3 and P4, tighten both travel stop nuts on Travel
Stops A until they are in contact with the end cap, then tighten an additional
1/4 turn.
*Clockwise rotation of the travel stops will shorten actuator stroke,
counterclockwise rotation will lengthen actuator stroke�

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Section 2: Installation
Installation
Set Counterclockwise Rotation (Travel Stops B)
1. Relieve all pressure from the actuator.
2. Loosen travel stop nuts on Travel Stops B.
3. Ensure actuator lockout (if provided) is disengaged.
4. Unthread Travel Stops B-1 and B-2 four to five full turns each.*
5. Adjust both B-1 travel stops until they contact the clevis simultaneously. It will
be necessary to apply pressure to P1 and P2 between adjustments to determine
the final position of travel.
6. With pressure to P1 and P2, thread in Travel Stops B-2 until they are in firm
contact with the clevis.
Figure 6
7. With pressure still to P1 and P2 ensure that all Travel Stops B are in firm contact
with the clevis and tighten all travel stop nuts until they are in contact with the
body, then tighten an additional 1/4 turn.
*Clockwise rotation of the travel stops will shorten actuator stroke,
counterclockwise rotation will lengthen actuator stroke�

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Section 3: Troubleshooting
Troubleshooting
Section 3: Troubleshooting
WARNING: DEPRESSURIZE COMPONENTS PROPERLY
Do not remove/loosen tie rod nuts unless cylinder is fully depressurized.
Components may exit the actuator dangerously if disassembly is attempted under pressure.
Ensure that all process lines are safe.
Read all maintenance instructions before starting work.
Table 2�
ISSUE CAUSE SOLUTION
Irregular or Stuttering Stroke
Supply pressure too low Verify operating pressure is correct
Worn internal components See Section 4.3 to 4.6
Damaged or valve Consult valve manufacturer
Leakage
Travel stop nut is not tight Tighten travel stop nut with pressure
relieved from actuator
Damaged Piston O-ring See Section 4.3
Damaged cylinder seals See Section 4.3
Improper Travel
Travel stops are not correctly set See Section 2.4
Internal cylinder contaminants
preventing normal stroke See Section 4.3
Damaged valve Consult valve manufacturer
Operating/Stroking too slowly
Supply pressure too low
Verify operating pressure will supply
torque needed to operate valve
correctly
Internal cylinder contaminants
preventing normal stroke See Section 4.3
Damaged valve Consult valve manufacturer
Damaged seals or O-rings caus-
ing loss of pressure See Sections 4.3 to 4.6
Damaged supply lines Inspect supply and lines replace as
needed
Limitation of accessories or
port size Upgrade accessories or port size
NOTE:
Performing piston seal replacement on one cylinder at a time will allow maintenance
while retaining travel stop adjustment. If both cylinders will be removed at the same
time, the travel stops must be fully unthreaded prior to removing the end caps. Leaving
the travel stops in place will put spring pressure on the end cap when it is removed,
which could cause serious injury or death.

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Section 4: Maintenance
Maintenance
Section 4: Maintenance
4�1 Periodic Maintenance Schedule
General service actuators do not require periodic maintenance. Severe service actuators
may require periodic maintenance based on operating conditions. Severe service
may include but is not limited to high speed, high cycle, highly corrosive, explosive
atmosphere, and others. Special applications may require individual maintenance
schedules. Contact Bettis for help developing a maintenance schedule for your
application.
NOTE:
This product is only intended for use in large-scale fixed installations excluded from the
scope of Directive 2011/65/EU on the restriction of the use of certain hazardous
substances in electrical and electronic equipment (RoHS 2).
4�2 Lubrication
Bettis actuators are lubricated for life. For special applications, grease fittings may be
provided. Use the grease fittings (if applicable) incorporated into the torque module of
your actuator to apply additional lubricant. The frequency of this lubrication will depend
on the application of the actuator. For any questions regarding the frequency of this
operation or appropriate lubrication compounds, contact your Bettis distributor.
4�3 Piston Seal Replacement
1. Exhaust all pressure and disconnect all supply lines.
2. Loosen all tie rod nuts until they are flush with the ends of the tie rods.
3. Check that there is no pressure against the end cap by verifying that the end
cap is not being forced against the tie rod nuts.
WARNING: EXHAUST ALL PRESSURE AGAINST END CAP
If there is force against the end cap, stop. Do not continue further until it is assured that the
unit is safe to disassemble.

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Section 4: Maintenance
Maintenance
4. Remove the end cap. Be careful not to lose the cylinder seal located on the
internal side of the end cap.
Figure 7
5. Remove the cylinder. Be careful not to damage the internal surface of the
cylinder as this will compromise the piston’s ability to seal.
6. Replace the piston O-ring and wiper ring as needed. Be sure to lubricate the new
O-ring and wiper ring with the correct Bettis approved lubricant if they are
replaced.
7. Inspect the piston bolt for any corrosion or wear (pitting, cracking). If excessive
corrosion or wear is apparent, a new actuator or actuator components may
be necessary.
Figure 8
Piston O-ring
Wiper Ring
Piston Bolt
8. Lubricate the internal surface of the cylinder with a light coat of the correct
Bettis approved lubricant and slide the cylinder back over the piston and into the
cylinder seal groove of the base plate, taking care not to pinch the piston O-ring.
9. Place the end cap back over the tie rods. Be sure that the cylinder is seated
in the cylinder seal groove of the end cap with the cylinder seal still in place
between the cylinder and the end cap.

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Section 4: Maintenance
Maintenance
10. Secure the end cap with the tie rod hex nuts you removed in step two.
Hand tighten, and then torque the hex nuts to half and then full values
according to the table below using the pattern designated.
Table 3�
Cylinder Size (In) Ft-Lbs Nm
6 15 20
8 35 48
10 35 48
12 35 48
16 56 76
20 58 79
24 87 118
Figure 9
4 Bolt
Pattern
1 4
23
1
3
52
4
6
6 Bolt
Pattern
12 Bolt
Pattern
1
11
3
7
9
52
12
4
8
10
6
10 Bolt
Pattern
1
8
10
5
3
7
2
9
6
4
8 Bolt
Pattern
1
2
3
4
5
6
7
8

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Section 4: Maintenance
Maintenance
11. Complete steps 1 to 10 on the second force module of the actuator.
12. Leak Test.
13. Reinstate the actuator to service.
4�4 Rod Seal Replacement
1. Follow steps 1 to 4 of Section 4.3.
2. Apply heat to piston hub and set screw to break thread locker, and remove set
screw.
Figure 10
3. Unthread the piston from the piston bolt.
Figure 11
4. Use heat to break thread locker. Remove all socket head cap screws (SHCS) se-
curing the seal retainer to the base plate and slide the seal retainer off the open
end of the piston bolt.

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Section 4: Maintenance
Maintenance
5. Remove the seal retainer and seal carrier.
Figure 12
Seal Carrier
Seal Retainer
6. Lubricate the new seal carrier, piston bolt, the internal and external seal carrier
O-rings.
7. Place the internal and external seal carrier O-rings in their respective grooves on
the seal carrier.
8. Slide the seal carrier back over the open end of the piston bolt with the external
seal carrier O-ring facing the base plate. Be careful not to damage the internal
seal carrier O-ring on the threads of the piston bolt.
9. Secure the seal carrier with the seal retainer and the socket head cap screws
removed in step four. Apply medium strength thread locker and torque to
44 in-lb (5 Nm).
10. Apply medium strength thread locker to the internal threads of the piston and
thread the piston back onto the piston bolt to the point of refusal.
11. Apply medium strength thread locker to the piston set screw and thread the set
screw into the neck of the piston. Torque the set screw to the corresponding
value in the table below.
Table 4�
Piston Size (In) Ft-Lbs Nm
6 14 18
8, 10, 12, 16 28 37
20, 24 47 65
12. Follow steps 8 to 10 of Section 4.3.
13. Repeat steps 1 to 12 of this section on the second force module.

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Section 4: Maintenance
Maintenance
4�5 Yoke Seal and Bushing Replacement
In Bettis RGS F-Series actuators, the yoke seal does not serve any purpose other than to
prevent external contaminants from entering the torque module. The following steps
can be followed to replace the yoke seal and/or bushings.
1. Depressurize the actuator and remove all supply lines.
2. Remove the actuator from the valve.
3. Ensure lockout (if provided) is disengaged.
4. Remove the hex nuts which secure the force modules to the torque module of
the actuator. Do this for both force modules.
Figure 13
5. Separate the force modules from the torque module. This can be done by
simply pulling the force modules away from the torque module simultaneously.
Figure 14

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Section 4: Maintenance
Maintenance
6. Remove any hex nuts and bolts securing the two halves of the body together.
Figure 15
7. Separate the two halves of the body. This may require the use of a pry bar as the
joint between the body halves is filled with sealant during assembly.
8. Remove the yoke from the bottom half of the torque module.
Figure 16
Top Body Plate
Yoke Assembly
Bottom Body
Plate

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Section 4: Maintenance
Maintenance
9. Inspect the yoke seals and bushings, and replace all necessary components.
Be sure to lubricate the new yoke seals with the correct Bettis approved lubri-
cant prior to their installation.
Figure 17
Yoke Seals
Yoke Bushings
Size 488 and larger the O-ring is in a groove in the body
10. Visually inspect the body slots as well as the pins and rollers on the clevises for
wear. If excessive wear is present new slide inserts(if applicable), pins, rollers, or
a new actuator may be necessary for further safe, reliable operation.
11. Remove the original sealant from the joining edges of the two separate halves
of the body.
12. Position the yoke as shown below. This will allow the pins and rollers of the
force modules to slide into their appropriate position between the yoke arms.
Figure 18