Some process control system’s 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.
Precise Process Control System control with Valves
• Rotary valves, such as high-performance butterfly and plug valves employing low friction bearings and packing’s 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.