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Installation, Operation and Maintenance Manual
AT Series without Spur
Quarter-Turn Gear Boxes
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July 2016
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Installation, Operation and Maintenance Manual
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Table of Contents
Section 1: Preface
1.1 Purpose ......................................................................................................... 1
Section 2: About the AT Series
2.1 Introduction .................................................................................................. 2
2.2 The AT Series Operator .................................................................................. 2
Section 3: Storage and Preinstallation
3.1 Before Installation ......................................................................................... 5
Section 4: Installation
4.1 Mounting Types ............................................................................................ 6
Table of Contents
July 2016
Section 5: AT Series Gearbox Operation
5.1 Manual Use ................................................................................................... 7
5.2 Stopper Setting ............................................................................................. 8
Section 6: Lubrication
6.1 Application ................................................................................................. 10
Section 7: Disassembly and Reassembly
Instructions
7.1 Removal of Cover ........................................................................................ 11
7.2 Dismantling of Worm Line Assembly ........................................................... 12
7.3 Removal of Worm Wheel ............................................................................. 13
7.4 Reassembly of AT Series Gearbox .................................................................13
Section 8: Document Revision
Appendix A: List of Figures
iTable of Contents
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Section 1: Preface
July 2016
Section 1: Preface
1.1 Purpose
Bettis Actuation Technologies is an Emerson Business Unit that specializes in the
manufacture of valve actuators and manual operators. Its manual actuation product range
consists of three series of valve operators as mentioned below:
• Quarter-turn worm gear operators for manual valve operation (AT Series)
• Quarter-turn worm gear operators for electrical actuation of valves (EA Series)
• Quarter-turn worm gear manual overrides for pneumatic/hydraulic operation
valves (MOR Series)
The AT Series is a selection of quarter turn worm gear operators for manually operated
valve systems. The AT Series gear operator is used to operate the valve manually with the
help of a hand wheel.
The AT Series gearbox is used to operate either a buttery valve or a ball valve or a plug
valve or used in damper applications or any 90-degree device. The torque is transmitted
through the hand wheel and worm shaft which in turn, drives the worm wheel thereby
multiplying the torque transmitted from worm shaft to the valve stem, which is connected
to the worm wheel.
Installation, Operation and Maintenance Manual
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The purpose of this IOM is to help the user of this equipment on the following:
• Safety instructions
• Installation of AT Series gearboxes
• Operation of AT Series gearboxes
• Maintenance of AT Series gearboxes
Safety notices in this manual highlight the precautions the user must take in order to
avoid personal injury and damage to the equipment. The user must read this manual
before attempting to install the equipment or operate or carry out maintenance of the
equipment. Failure to follow the instructions mentioned in this manual could result in
serious personal injury, equipment damage, operational difculty and voiding of the
warranty.
Bettis Actuation Technologies will not be responsible for any possible damage or physical
injury resulting from the use of their equipment other than the designed application or
the lack of care taken by the user during installation, operation or maintenance of the
equipment. Such risks lie entirely with the user.
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Preface
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Installation, Operation and Maintenance Manual
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Section 2: About the AT Series
2.1 Introduction
The AT Series gear operators are quarter-turn worm gearboxes which are used to operate
quarter-turn valves like ball, buttery and plug valves or any other quarter-turn device.
The AT Series gearbox has one valve mounting face on the bottom side (either plain face
or ribbed face depending on model) and the worm wheel of the gearbox has a bore to suit
the valve stem directly or suit the coupling between the valve stem and gearbox. This is so
because the gearbox can be directly mounted onto the valve or it can be coupled with the
valve with the help of a bracket and coupling.
Below are the different views of the AT Series gearbox highlighting its different parts, as
well as instructions.
2.2 The AT Series Operator
Section 2: About the AT Series
July 2016
Figure 1 AT Series General View
About the AT Series
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Section 2: About the AT Series
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2
3
4
5
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7
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Figure 2 AT Series Exploded View
Installation, Operation and Maintenance Manual
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Table 1. Component List
PART NUMBER
1 Housing
2 Housing Cover
3 Gear
4 Worm
5 Bearing
6 Input Shaft
7 Stopper Bolt
8 O-ring
9 Indicator
10 Handwheel
PART NAME
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About the AT Series
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Figure 3 AT Series Bottom View
Section 2: About the AT Series
July 2016
PCD
ID
About the AT Series
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Section 3: Storage and Preinstallation
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Installation, Operation and Maintenance Manual
Section 3: Storage and Preinstallation
3.1 Before Installation
1. Firstly check whether the AT Series gearbox received is not in damaged condition
during transportation.
2. Also, check whether the data on the nameplate corresponds to the expected
product data.
3. If the AT Series gearbox is to be stored indoors for a brief period (less than 12
months), it should be ensured that the gearbox is kept in a dry place preferably on
a wooden pallet and protected from dust.
4. If the AT Series gearbox is to be stored outdoors for a brief period (less than 12
months), it should be protected from coming in direct contact with rain with a
canvas or something similar. Also, it should be kept on a wooden pallet or a raised
platform to avoid direct contact with the ground and protected from dust.
5. If the AT Series gearbox is to be stored for a longer period (more than 12 months),
then the mating surfaces, couplings, exposed parts, etc. should be coated with a
protective oil or grease to avoid corrosion.
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Storage and Preinstallation
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Installation, Operation and Maintenance Manual
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Section 4: Installation
4.1 Mounting Types
The AT Series gearbox can be installed onto the valve in two different ways:
1. DIRECT MOUNTING -- This involves mounting the gearbox directly on the valve
stem and valve mounting ange.
2. BRACKET MOUNTING – This involves installing the bracket on the valve ange.
The AT Series gearbox is mounted on the bracket and is coupled to the valve stem
with a coupling.
The following procedure should be followed while installation of AT Series gearboxes onto
valve systems:
1. The valve and gearbox should be in the same position i.e. completely ‘open’ or
completely ‘closed’ position, at the time of installation. Any exception to this will
cause a condition wherein the person operating the valve might try to open the
valve with a gearbox which is already in open position. This will lead to excessive
torque on the worm and worm wheel assembly which might lead to excessive
wear/breakage of internals.
2. The gearbox should be positioned in such a way so that “clockwise rotation of
hand wheel gives clockwise rotation of output to close the valve”.
3. Check whether the mounting dimensions (stem diameter and mounting PCD)
between valve and the gearbox are correct and as per the requirement.
4. The mounting ange of valve and gearbox should be degreased.
5. Mount the gearbox on valve or spigot carefully making sure the valve stem/
coupling enters the sector gear bore. Never use the hand wheel or spur gear
attachment to lift the gearbox while mounting onto the valve.
6. Fasten the mounting bolts with the help of spring washers. Use 8.8 grade fasteners
or above.
7. In case of reinstallation after a long storage period, check the status of oil seals,
O-rings and also whether the gearbox body/cover are cracked or broken.
Section 4: Installation
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Installation
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Section 5: AT Series Gearbox Operation
July 2016
Installation, Operation and Maintenance Manual
Section 5: AT Series Gearbox Operation
5.1 Manual Use
1. The gearbox is to be operated with a hand wheel which is supplied along with the
gearbox.
2. Do not manually operate the gearbox with devices other than the hand wheel.
Using cheater bars, wheel wrenches or other such devices on the gearbox hand
wheel may cause serious injury and/or damage to the gearbox or valve.
3. In standard applications, “clockwise rotation of hand wheel gives clockwise
rotation of output to close the valve”.
Figure 4 Hand Wheel Rotation
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AT Series Gearbox Operation
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Figure 5 Another View of Hand Wheel Rotation
Section 5: AT Series Gearbox Operation
July 2016
5.2 Stopper Setting
1. There are two mechanical stoppers on all AT Series gearboxes to limit the stroke
from ‘open’ to ‘close’.
2. This stroke of 90o needs to be set correctly for all gearboxes as described below.
3. Withdraw the stoppers completely. Rotate the valve to the fully closed position
by rotating the hand wheel clockwise. Once the valve is fully closed, advance the
stopper till it touches the sector gear. Secure this stopper position with a nut.
4. Similarly, for stopper setting at fully open position of the valve, withdraw the
stopper at open side completely. Rotate the valve to the fully open position by
rotating the hand wheel anti-clockwise. Once the valve is fully opened, advance
the stopper till it touches the sector gear. Secure this stopper position with a nut.
AT Series Gearbox Operation
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Section 5: AT Series Gearbox Operation
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Figure 6 Stopper Bolt Location
Installation, Operation and Maintenance Manual
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STOPPER BOLT
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AT Series Gearbox Operation
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Section 6: Lubrication
6.1 Application
1. The AT Series gearbox is grease lubricated.
2. All AT Series gearboxes are supplied with EP-1 premium quality lithium soap based
grease (NLGI grade 1) suitable for an ambient temperature of -20o to + 120o (in
case of speciality greases, the temperature range could be different).
3. Grease should be changed after 6 months if the gearbox is in continuous operation
whereas it should be changed after 12 months if it is operated intermittently.
4. Do not mix different greases.
Section 6: Lubrication
July 2016
Lubrication
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Section 7: Disassembly and Reassembly
July 2016
Installation, Operation and Maintenance Manual
Section 7: Disassembly and Reassembly
Instructions
7.1 Removal of Cover
• Remove the cover by loosening the cover bolts with a spanner.
• Each time the cover is removed, the gasket sealing is lost as it is a liquid sealant.
Reapply gasket sealant (Loctite no. 596 or equivalent).
• Take proper care not to damage the mating surface of the cover.
Figure 7 Cover Removal
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Disassembly and Reassembly
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Installation, Operation and Maintenance Manual
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Section 7: Disassembly and Reassembly
7.2 Dismantling of Worm Line Assembly
• Remove the spring pins with which the worm is xed to the input shaft.
• Pull the input shaft out of the main housing. This will disassemble the entire
worm line assembly. Now, remove the worm and all other small parts like spacers,
washers, bearings, etc. from this assembly.
Figure 8 Worm Line Removal
July 2016
Disassembly and Reassembly
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Section 7: Disassembly and Reassembly
July 2016
Installation, Operation and Maintenance Manual
7.3 Removal of Worm Wheel
• Remove the worm wheel by lifting it from the gearbox housing.
• Replace and lubricate the O-rings in the housing before reassembling the worm
wheel.
Figure 9 Removing the Worm Wheel
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7.4 Reassembly of AT Series Gearbox
• In reassembly of the AT Series gearbox, follow all above steps in reverse order.
• Be sure to lubricate all mating/rotating parts with grease.
• Ensure to provide a liquid sealant on both covers and housing.
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Disassembly and Reassembly
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Installation, Operation and Maintenance Manual
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Section 8: Document Revision
Table 2. Revision Overview
ECN DATE REVISION STATU S BY * DATE
XXXXXX 7/15/2016 1 Completed Charles Rico 7/15/2016
* Signatures on le Bettis, Houston, Texas
Section 8: Document Revision
July 2016
Document Revision
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Appendix
July 2016
Installation, Operation and Maintenance Manual
Appendix A: List of Figures
Figure 1 AT Series General View .......................................................................................... 2
Figure 2 AT Series Exploded View ........................................................................................ 3
Figure 3 AT Series Bottom View .......................................................................................... 4
Figure 4 Hand Wheel Rotation ............................................................................................ 7
Figure 5 Another View of the Hand Wheel Rotation ............................................................ 8
Figure 6 Stopper Bolt Location ........................................................................................... 9
Figure 7 Cover Removal .................................................................................................... 11
Figure 8 Worm Line Removal ............................................................................................ 12
Figure 9 Removing the Worm Wheel ................................................................................ 13
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Appendix
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World Area Confi guration Centers (WACC) offer sales support, service,
inventory and commissioning to our global customers.
Choose the WACC or sales offi ce nearest you:
NORTH & SOUTH AMERICA
19200 Northwest Freeway
Houston TX 77065
USA
T +1 281 477 4100
Av. Hollingsworth
325 Iporanga Sorocaba
SP 18087-105
Brazil
MIDDLE EAST & AFRICA
P. O. Box 17033
Jebel Ali Free Zone
Dubai
T +971 4 811 8100
P. O. Box 10305
Jubail 31961
Saudi Arabia
T +966 3 340 8650
T +55 15 3413 8888
24 Angus Crescent
ASIA PACIFIC
Longmeadow Business Estate East
P.O. Box 6908 Greenstone
No. 9 Gul Road
#01-02 Singapore 629361
T +65 6777 8211
No. 1 Lai Yuan Road
1616 Modderfontein Extension 5
South Africa
T +27 11 451 3700
EUROPE
Wuqing Development Area
Tianjin 301700
P. R. China
T +86 22 8212 3300
Holland Fasor 6
Székesfehérvár 8000
Hungary
T +36 22 53 09 50
Strada Biffi 165
29017 Fiorenzuola d’Arda (PC)
Italy
T +39 0523 944 411
For complete list of sales and manufacturing sites, please visit
www.emerson.com/actuationtechnologieslocations or contact us at
info.actuationtechnologies@emerson.com
www.emerson.com/bettis
©2018 Emerson. All rights reserved.
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TM
is a mark of one of the Emerson family of companies.
Bettis
All other marks are property of their respective owners.
The contents of this publication are presented for information purposes
only, and while every effort has been made to ensure their accuracy,
they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use
or applicability. All sales are governed by our terms and conditions, which
are available on request. We reserve the right to modify or improve the
designs or specifications of our products at any time without notice.
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