Emerson.Pdf

CONTROL VALVE
HANDBOOK

Fourth Edition

NORTH AMERICA
Emerson Process Management
Marshalltown, Iowa 50158 USA
T 1 (641) 754−3011
F 1 (641) 754−2830
www.EmersonProcess.com/Fisher

LATIN AMERICA
Emerson Process Management
Sorocaba, Sao Paulo 18087 Brazil
T +(55)(15)238−3788
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www.EmersonProcess.com/Fisher

EUROPE
Emerson Process Management
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ASIA PACIFIC
Emerson Process Management
Singapore 128461 Singapore
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www.EmersonProcess.com/Fisher

Fisher is a mark owned by Fisher Controls International LLC, a member of theEmerson
Process Management business division of Emerson Electric Co. The Emerson logo is a
trademark and service mark of Emerson Electric Co. All other marks are the property of their
respective owners.
The contents of this publication are presented for informational purposes only, and while
every effort has been made to ensure their accuracy, they are not to be construed as
warranties orguarantees, express or implied, regarding the products or services described
herein or their use or applicability. We reserve the right to modify or improve the designs or
specifications of such products at any time without notice.
Neither Emerson, Emerson Process Management nor any of their affiliated entities assumes
responsibility for the selection, use and maintenance of any product. Responsibilityfor the
selection, use and maintenance of any product remains with the purchaser and end-user.
Printed in U.S.A.
EFisher Controls International LLC 2005
D101881X012

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Preface to Fourth Edition

Control valves are an increasingly vital component of modern manufacturing around
the world. Properly selected and maintained control valves increase efficiency, safety, profitability, and ecology.
TheControl Valve Handbook has been a primary reference since its first printing in
1965. This fourth edition presents vital information on control valve performance and
the latest technologies.
D Chapter 1 offers an introduction to control valves including definitions for
common control valve and instrumentation terminology.
D Chapter 2 develops the vital topic of control valve performance.
D Chapter 3covers valve and actuator types.
D Chapter 4 describes digital valve controllers, analog positioners, boosters,
and other control valve accessories.
D Chapter 5 is a comprehensive guide to selecting the best control valve for
an application.
D Chapter 6 covers the selection and use of special control valves.
D Chapter 7 covers desuperheaters, steam conditioning valves, and turbine
bypasssystems.
D Chapter 8 offers typical control valve installation and maintenance procedures.
D Chapter 9 includes information on control valve standards and approval
agencies throughout the world.
D Chapter 10 offers useful tables of engineering reference data.
D Chapter 11 includes piping reference data.
D Chapter 12 is a handy resource for common conversions.
The Control Valve Handbook is both a textbookand a reference on the strongest link
in the control loop: the control valve and its accessories. This book includes extensive and proven knowledge from leading experts in the process control field including contributions from the ISA and the Crane Company.
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Table of Contents

Chapter 1. Introduction to Control Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What Is AControl Valve? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Process Control Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Sliding-Stem Control Valve Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rotary-Shaft Control Valve Terminology . . . . . . . . . . . . . . . . . . . . . . . ....