Emerson Bettis RGS Q Series User manual

Bettis RGS Q-Series Stainless Steel
Spring-Return Actuators Single and
Double-Cylinder Types
Installation, Operation and Maintenance Manual
RGS011110-1 Rev. 0
September 2015

Installation, Operation and Maintenance Manual
RGS011110-1 Rev. 0
Table of Contents
September 2015
I
Table of Contents
Table of Contents
Section 1: Overview �������������������������������������������������������������1
Section 2: Installation �����������������������������������������������������������3
Section 3: Piping ������������������������������������������������������������������6
3.1 Single-Cylinder Types (Sizes 03, 04, 07 and 12) ............................................ 6
3.2 Double-Cylinder Types (Sizes 05, 10 and 14) ................................................ 6
Section 4: Travel Adjustment ������������������������������������������������7
4.1 Single-Cylinder Types (Sizes 03, 04, 07 and 12) ............................................ 7
4.2 Double-Cylinder Types (Sizes 05, 10 and 14) ................................................ 7
4.3 Outward Travel Adjustment ......................................................................... 7
4.4 Inward Travel Adjustment ............................................................................ 8
Section 5: Operation �������������������������������������������������������������9
Section 6: Maintenance������������������������������������������������������� 10
6.1 Piston Seal Replacement............................................................................ 10
6.2 Shaft Seal Replacement ..............................................................................15

September 2015
Installation, Operation and Maintenance Manual
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Section 1: Overview
Overview
Section 1: Overview
All Bettis RGS Q-Series actuators are designed and built with the intent that they will last
forever. Numerous design features reduce friction for enhanced operation, less wear and
longer life. Other features result in there being fewer dynamic seals - a seal that does not
exist cannot fail. Also, we employ readily available off the shelf seals that cost far less
than other’s proprietary parts, and we do so in a design that allows seal replacement
while the actuator remains in line (see Section 6, Maintenance Section).
Figure 1 Single-Cylinder Models Bettis RGS Q-Series 03SR, 04SR, 07SR, 12SR
Figure 2 Double-Cylinder Models Bettis RGS Q-Series 05SR, 10SR, 14SR

Installation, Operation and Maintenance Manual
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Section 1: Overview
Overview
Figure 3 Single-Cylinder Model Section View
Figure 4 Double-Cylinder Model Section View
NOTE:
Single and Double-Cylinder models are identical except for the cylinder quantity.

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Installation, Operation and Maintenance Manual
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Section 2: Installation
Installation
Section 2: Installation
• Bettis RGS Q-Series actuators may be installed in any position/orientation.
Figure 5 Clockwise Shaft Rotation
In this view, the spring causes
clockwise shaft rotation�
Figure 6 Counterclockwise Shaft Rotation
In this view, the spring causes
counterclockwise shaft rotation�
• Looking down on the actuator, a cylinder in Figure 6 will have the spring cause
counterclockwise rotation of the actuator shaft when pressure is exhausted
from the end cap port.
• The body port on all Bettis RGS Q-Series spring-return actuators is for breathing purposes
only. Single and double-cylinder body ports may be pressurized to add to the spring
forces, but provides minimal benefit and defeats the rationale for having a spring-return.
• All Bettis RGS Q-Series actuators have identical drive geometries on both faces of the body,
therefore they may have their action reversed simply by turning the top side down.
• Single and double-cylinder actuators include NAMUR mounting pads and drive
adapters, however, unlike competitor’s actuators, the NAMUR drive may be mounted
to either side of the single and double-cylinder models to enable action reversal.

Installation, Operation and Maintenance Manual
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Section 2: Installation
Installation
Figure 7 NAMUR Mounting Pad
• Sizes 03, 04 and 05 have minimal body size, thus plate adapters provide the
NAMUR mounting pattern. All other sizes incorporate NAMUR mounting pat-
terns directly in the body machining - on both faces.
Figure 8 Sizes 03, 04 and 05
• Sizes 03, 04 and 05 have body mounting surfaces even with the cylinder flanges
allowing all size brackets to mount. Sizes 07, 10, 12 and 14 have cylinder flanges
that extend outward past the body mounting surface, but only when the actua-
tor is provided without a Universal Mounting Plate (UMP). Bracket width is an
important consideration unless a UMP is included in the assembly.
Figure 9 Sizes 07, 10, 12, 14 Without UMP

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Section 2: Installation
Installation
Figure 10 Sizes 07, 10, 12, 14 With UMP
• UMPs are a standard option that permits actuator mounting bolt patterns to
match that of the user’s valve or to replicate the dimensions of a competitor’s
actuator for ease of replacement.
• Single and double-cylinder actuators require no user lubrication.
• Springs are captured for safe disassembly. Springs do not extend when end caps
and cylinders are removed.

Installation, Operation and Maintenance Manual
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Section 3: Piping
Piping
Section 3: Piping
3�1 Single-Cylinder Types (Sizes 03, 04, 07 and 12)
Figure 11 Single-Cylinder Types (Sizes 03, 04, 07 and 12)
Breather port
Tube only to prevent
entry of air borne
contaminants�
Pressure ports
Tube single port to the pressure source�
Apply pressure to push piston inward�
Springs will cause pistons to travel
outward when pressure is exhausted�
3�2 Double-Cylinder Types (Sizes 05, 10 and 14)
Figure 12 Double-Cylinder Types (Sizes 05, 10 and 14)
Breather port
Tube only to prevent
entry of air borne
contaminants�
Pressure ports
Tube both ports to the pressure source�
Apply pressure to push pistons inward�
Springs will cause pistons to travel
outward when pressure is exhausted�

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Installation, Operation and Maintenance Manual
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Section 4: Travel Adjustment
Travel Adjustment
Section 4: Travel Adjustment
4�1 Single-Cylinder Types (Sizes 03, 04, 07 and 12)
• Travel adjustment screws are located on the end cap and the body.
• Hex nuts are provided with relief for a sealing O-ring that is forced into the
screw threads when tightened, thereby preventing loss of pressure.
• Loosen the hex nuts before attempting to adjust the screws.
• Clockwise screw rotation reduces actuator travel, counterclockwise rotation
increases travel.
• The end cap screw will be more difficult to adjust as the spring is pushing the
piston against the screw end. If necessary, apply pressure to the end cap port to
relieve the piston force.
• When travel adjustment is complete, retighten the hex nuts to seal the threads
and to secure the screw position.
4�2 Double-Cylinder Types (Sizes 05, 10 and 14)
• Travel adjustment screws are located on the end caps and the body such that
each piston’s travel is stopped independently but simultaneously.
• The end cap stops are readily adjusted but the body stops are for factory assem-
bly adjustment and not intended for user adjustment unless absolutely neces-
sary, as they require removal of the cylinders and springpaq.
4�3 Outward Travel Adjustment
• End caps stops include hex nuts which are provided with relief for a sealing
O-ring that is forced into the screw threads when tightened, thereby prevent-
ing loss of pressure.
• Loosen both hex nuts before attempting to adjust the end cap screws.
• Back off (turn counterclockwise) one of the stop screws, using the other to set travel.
• Clockwise screw rotation reduces actuator travel, counterclockwise rotation
increases travel.
• The screw may be difficult to adjust as the spring is pushing the piston against
the screw. If necessary, apply air pressure to the end cap port to relieve the
piston force.
• When travel adjustment is complete using the one screw, turn the other screw
clockwise until contact is made with the piston, then add 1/4 turn.
• Retighten the hex nuts to seal the threads and to secure the screw positions.