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

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

RGS011110-1 Rev. 0

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

RGS011110-1 Rev. 0

September 2015

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.

September 2015

Installation, Operation and Maintenance Manual

RGS011110-1 Rev. 0

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

RGS011110-1 Rev. 0

September 2015

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

September 2015

Installation, Operation and Maintenance Manual

RGS011110-1 Rev. 0

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

RGS011110-1 Rev. 0

September 2015

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�

September 2015

Installation, Operation and Maintenance Manual

RGS011110-1 Rev. 0

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.

Table of contents

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