8.3. Control valves
A valve selected as optimum for a level control process might not be the best selection for a flow control system. Also, the best valve for one flow control system might not be optimum for a system utilizing a different primary element or flow measurement means. Control valves are used in many applications, including liquid flow control, gas pressure reduction, steam flow to heaters, etc.
Control valves can be classified according to body design. The selection of a valve for a particular application is primarily a function of the process requirements, and no attempt will be made herein to cover this subject. Some of the more common types of control valve bodies are covered.
8.3.1. Globe body valve
One of the principle advantages ...
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