Installation, Operation and Maintenance Manual
RGS011110-3 Rev. 0
November 2015
Bettis RGS F-Series Spring-Return Actuators
Installation, Operation and Maintenance Manual
RGS011110-3 Rev. 0
Table of Contents
Section 1: Overview ��������������������������������������������������������������1
Section 2: Installation �����������������������������������������������������������2
2.1 Valve Attachment ........................................................................................ 3
2.2 Accessory Mounting .................................................................................... 3
2.3 Piping and Operation ................................................................................... 4
2.4 Travel Adjustment ........................................................................................ 7
Section 3: General Troubleshooting ��������������������������������������9
Section 4: Maintenance ������������������������������������������������������� 10
4.1 Periodic Maintenance Schedule ................................................................. 10
4.2 Lubrication................................................................................................. 10
4.3 Maintenance Kit ..........................................................................................12
4.4 Piston Seal Replacement .............................................................................12
4.5 Yoke Seal and Bushing Replacement .......................................................... 16
4.6 Pins and Rollers Replacement .................................................................... 20
Table of Contents
November 2015
Appendix A: ������������������������������������������������������������������������22
A.1 Force Module ............................................................................................ 22
A.2 Torque Module .......................................................................................... 24
Table of Contents
I
Section 1: Overview
November 2015
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.
Installation, Operation and Maintenance Manual
RGS011110-3 Rev. 0
1
Overview
Installation, Operation and Maintenance Manual
RGS011110-3 Rev. 0
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
Section 2: Installation
November 2015
Installation
2
Section 2: Installation
November 2015
Larger sizes have lifting eyes incorporated into their body section which may be used to
lift the actuator.
Figure 2
Installation, Operation and Maintenance Manual
2�1 Valve Attachment
RGS011110-3 Rev. 0
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
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.
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Installation
Installation, Operation and Maintenance Manual
RGS011110-3 Rev. 0
2�3 Piping and Operation
The operation of a Bettis RGS F-Series Spring-Return (SR) actuator is comparable to any
spring-return 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 chromeplated 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
Section 2: Installation
November 2015
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.
Installation
4
Section 2: Installation
November 2015
All Bettis actuators are shipped in the fail clockwise (Left-Hand) orientation unless
ordered as fail counter-clockwise (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.
Spring-Return (Left-Hand): pressure on the end cap ports pushes the pistons inward
and causes counterclockwise rotation. Springs push the pistons outward resulting in a
clockwise rotation.
Spring-Return (Right-Hand): pressure on the end cap ports pushes the pistons
inward and causes clockwise rotation. Springs push the pistons outward resulting in a
counterclockwise rotation.
Figure 3
Installation, Operation and Maintenance Manual
RGS011110-3 Rev. 0
Fail Clockwise
Fail Counter Clockwise
5
Installation
Installation, Operation and Maintenance Manual
RGS011110-3 Rev. 0
Piping Guidelines:
• Both end cap pressure ports (P1 and P2) must be utilized for proper operation.
• P1 and P2 are typically connected and powered by a single air pathway.
• P5 is a breather port that should be fitted with a filter or strainer.
Figure 4
P5 (2)
P1
Section 2: Installation
November 2015
P2
P1
P5 (2)
P2
Installation
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