Practical Control Valve Sizing Selection and Maintenance 1st Edition by Dave Mcdonald ISBN 1921007303 9781921007309
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Product details:
ISBN 10: 1921007303
ISBN 13: 9781921007309
Author: Dave Mcdonald
It is claimed that the majority of control valves throughout the world have not been correctly sized and that large numbers operate on manual mode. Whether this is true or not is difficult to establish but we do know that the method of sizing and selecting a control valve for a specific application is generally not well understood.
Although there are many factors that need to be taken into account the subject is not difficult to understand if dealt with in a logical manner. Many maintenance problems result from people treating the symptoms of a problem rather than tackling the true cause – a basic understanding of the principles is all that is usually needed to solve the problem for good.
This manual covers what happens inside a control valve; the difference between cavitation and flashing; choked flow; simple calculations to determine CV values; how to recognise severe service applications; the types of control valves and relative advantages; the different characteristics and specifying seat leakage rates; size actuators for linear and rotary applications; the advantages of pneumatic, hydraulic and electric types; how to select materials for bodies, trims, packing boxes, and gaskets; computer sizing programs; failure modes for control valves and new approaches to troubleshooting This manual is designed to maximise knowledge retention and understanding. It discusses specific problems and appropriate solutions.
Practical Control Valve Sizing Selection and Maintenance 1st Table of contents:
1 Introduction to Control Valves and Fluid Flow 1
1.1 Purpose of a control valve 2
1.2 Choked Flow Conditions (Critical Flow) 9
1.3 Typical control valve applications 12
1.4 Requirements of control valves 15
1.5 Training needs 17
2 Types of Control Valves 19
2.1 Broad classification of control valves 20
2.2 Sliding stem valves 20
2.3 Rotary Valves 35
2.4 Other types of control valves 40
2.5 Control valve selection summary 42
2.6 Summary 46
3 Valve Sizing for Liquid Flow 47
3.1 Principles of the full sizing equation 48
3.2 Formulae for sizing control valves for Liquids 51
3.3 Practical example of Cv sizing calculation 52
3.4 Summary 54
4 Valve Sizing for Gas and Vapor Flow 55
4.1 Compressibility in gas and steam 55
4.2 Formulae for sizing control valves for gas and vapour service56
4.3 Practical example of Cv sizing calculation 57
4.4 Notes on gas sizing and noise 58
4.5 Summary 58
5 Software Tools for Valve Sizing 61
5.1 Valve sizing software packages in the selection process 61
5.2 Examples of software packages 62
5.3 Software demonstration package 63
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Tags: Dave Mcdonald, Control Valve, Maintenance