Valves are the controlling elements in fluid flow and pressure systems.
Like many other engineering components, they have developed over some three centuries from primitive arrangements into a wide range of engineered units satisfying a great variety of industrial needs.
The wide range of valve types available is gratifying to the user because the probability is high that a valve exists that matches the appli-cation. But because of the apparently innumerable alternatives, the user must have the knowledge and skill to analyze each application and deter-mine the factors on which the valve can be selected. He or she must also have sufficient knowledge of valve types and their construction to make the best selection from those available.
Reference manuals on valves are readily available. But few books, if any, discuss the engineering fundamentals or provide in-depth informa-tion about the factors on which the selection should be made.
This book is the result of a lifelong study of design and application of valves, and it guides the user on the selection of valves by analyzing valve use and construction. The book is meant to be a reference for prac-ticing engineers and students, but it may also be of interest to manufac-turers of valves, statutory authorities, and others. The book discusses manual valves, check valves, pressure relief valves and rupture discs. Revisions in the fourth edition include a full rewriting of the chapters
on pressure relief valves and rupture discs. These revisions take full account of current U.S. practice and the emerging European standards.

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