Microsoft Word Course Control valves R. doc

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Control Valves Basics - Sizing & Selection
FMD3x00 98 DB Initialize (5), configuration-and-evaluation-software-pi-9045582-en-gb, configuration-and-evaluation-software-pi-9045582-en-gb, Document, colour present

Equal Percentage Characteristics

General rules
How do you decide which valve control to use Here are some rules of thumb
Linear Characteristics
• Used in liquid level or flow loops.
• Used in systems where the pressure drop across the valve is expected to remain fairly constant (i.e. steady state systems.
• Used when the pressure drop across the valve is a large proportion of the total pressure drop.
Equal Percentage Characteristics
• Used in processes where large changes in pressure drop are expected.
• Used in processes where a small percentage of the total pressure drop is permitted by the valve.
• Used in temperature and pressure control loops.

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