Valve Selection Handbook, 5 Ed by Peter Smith, R W Zappe

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The purpose of this book is to assist the Piping Specifying Engineer in
the selection of valves for a specific application and that meet the design
parameters of the process service. Valve selection is based on function,
material suitability, design pressure/temperature extremities, plant life, end
connections, operation, weight, availability, maintenance, and cost. I have
deliberately placed cost at the end for a reason. If the valve does not meet
the design criteria, then even if it is free, it is still too expensive, because of
the costs to replace it when it fails. Just like life, valve selection is a series
of compromises.
Valves are the components in a fluid flow or pressure system that regulate
either the flow or the pressure of the fluid. This duty may involve stopping
and starting flow, controlling flow rate, diverting flow, preventing back
flow, controlling pressure, or relieving pressure.
These duties are performed by adjusting the position of the closure
member in the valve. This may be done either manually or automatically.
Manual operation also includes the operation of the valve by means of a
manually controlled power operator. The valves discussed here are manually
operated valves for stopping and starting flow, controlling flow rate,
and diverting flow; and automatically operated valves for preventing back
flow and relieving pressure. The manually operated valves are referred to
as manual valves, while valves for the prevention of back flow and the
relief of pressure are referred to as check valves and pressure relief valves,
respectively.
Rupture discs are non-reclosing pressure-relieving devices which fulfill
a duty similar to pressure relief valves.

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Filed under: Handbook, Peter, Smith, Selection, Zappe, Valve

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