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

Precise system control
Some system control loops require highly accurate control in the face of severe disturbances. Ideally the control valve should have low friction, no backlash, and a stable flow pattern.
• Rotary valves, such as high-performance butterfly and plug valves employing low- friction bearings and packings provide good control.
• Ball valves have large backlash and are not recommended.
• Linear motion valves, such as globe valves cannot match the low friction of rotary valves and must be critically evaluated.

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