Section 2: About The At Series; Introduction; The At Series Operator - Emerson AT Series Installation, Operation And Maintenance Manual

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, butterfly 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 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.
Please find below different views of the AT Series gearbox highlighting its different parts as
well as instructions and warning plates.
2.2

The AT Series Operator

Figure 1
About the AT Series
AT Series General View
Section 2: About the AT Series
July 2016
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