Control valve oscillation

After the disappearance of the external excitation, there is still a having the the obvious amplitude of vibration. Oscillation is sometimes referred to as loop or limit cycle. Oscillation is at or near the evidence of the stability limit at work. The control valve, the control system or valve positioner instability will cause the actuator loading pressure fluctuations, oscillation along.
ISA: Instrument Society of America abbreviations. Now known as the International Measurement and Control Association.
Gauge pressure: by an automatic controller to the output pressure of the valve work.high temperature solenoid valve
Loading pressure: the pressure used to locate the pneumatic actuator. This is the actual pressure acting on the actuator diaphragm or piston. If there is no valve positioners, loading pressure gauge pressure.
NACE: used to represent the United States Association of Corrosion Engineers. With the increasingly international scope of the organization, the term has been changed to the international NACE. NACE is no longer an acronym.
0SHA: Occupational Safety and Health Act (United States) abbreviation.two position three way valve