초록 ▼

A control system for positioning a control valve is disclosed. The control system employs first and second control loops, and a plug and seat valve assembly. The first control loop monitors a position or variable of the valve or device being controlled and compares it to a provided setpoint to gener

A control system for positioning a control valve is disclosed. The control system employs first and second control loops, and a plug and seat valve assembly. The first control loop monitors a position or variable of the valve or device being controlled and compares it to a provided setpoint to generate a setpoint for the plug and seat valve. The second control loop compares the measured position of the plug and seat valve to the second setpoint to generate a correction signal to accurately position the plug and seat valve. By employing first and second control loops, the accuracy and responsiveness to which the control valve is positioned is improved.

대표청구항 ▼

[ What is claimed is:] [25.]25. A method for positioning a control valve, comprising the steps of:monitoring the position of the control valve;comparing the position of the control valve to a first setpoint;generating a second setpoint based on the comparing step;monitoring the position of a plug an

[ What is claimed is:] [25.]25. A method for positioning a control valve, comprising the steps of:monitoring the position of the control valve;comparing the position of the control valve to a first setpoint;generating a second setpoint based on the comparing step;monitoring the position of a plug and seat valve;comparing the position of the plug and seat valve to the second setpoint;generating a correction signal based on the comparison of the plug and seat valve position to the second setpoint; andpositioning the control valve based on the correction signal.