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Whilst a wide variety of valve types exist, this document will concentrate on those which are most widely used in the automatic control of steam and other industrial fluids. These include valve types which have linear and rotary spindle movement.
Linear types include globe valves and slide valves.
Rotary types include ball valves, butterfly valves, plug valves and their variants.
The first choice to be made is between two-port and three-port valves.
A basic control system would normally consist of the following components:
All of these terms are generic and each can include many variations and characteristics. With the advance of technology, the dividing line between individual items of equipment and their definitions are becoming less clear. For example, the positioner, which traditionally adjusted the valve to a particular position within its range of travel, can now:
However, for the sake of clarity at this point, each item of equipment will be considered separately.
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