Title:
弁棒の破損検出方法
Document Type and Number:
Japanese Patent JP4088160
Kind Code:
B2
Abstract:
A method for providing an indication and alarm of a possible failure in a fluid control valve stem, plug or seat in a process control system having a microprocessor based valve positioner. The drive pressure, drive signal and valve position feedback are monitored. If greater than a predetermined change in the drive pressure or the valve position feedback is detected, then a second series of detection steps is initiated. In the second detection steps the present set point to process value relationship, such as flow rate or other process variable is compared to a stored test cycle derived set point to process value relationship for the same set point. If there is a process value change, then the operator is alerted as this change may indicate there is a damaged valve stem, plug, or seat problem which needs to be inspected.
Inventors:
Larson, Brent H.
Barnes, Harry A.
Brown, rally keith
Barnes, Harry A.
Brown, rally keith
Application Number:
JP2002581868A
Publication Date:
May 21, 2008
Filing Date:
March 21, 2002
Export Citation:
Assignee:
Fisher Controls International Limited Liability Company
International Classes:
F16K35/00; F16K37/00
Domestic Patent References:
| JP10054778A | ||||
| JP6129403A | ||||
| JP6094159A | ||||
| JP1106603U |
Foreign References:
| WO1997048026A1 |
Attorney, Agent or Firm:
Yoshihiro Tsunoda