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Actuated, Control and Relief Valves
A valve is a device that directs or controls the flow of a process fluid by opening, closing, or partially obstructing one or more of its ports. As such, they are found in virtually every industrial process throughout the oil and gas, petrochemical, pharmaceutical and water industries
Valves may be operated manually e.g. by a handwheel, they may be automatic e.g. driven by changes in pressure, temperature, or flow, or they may provide control based on an external input e.g. a 4-20 mA signal from a process control system. In this latter case the valve is sometimes referred to as the "final element" of the control loop.
This page contains links to a wide variety of valve related reference data, tools, resources and look up tables as used by instrument engineers when specifying control valves, sizing relief valves and purchasing actuated valves.
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The following books, available from Amazon, may be of interest to instrument designers and engineers: