Valve positioner with pressure feedback, dynamic correction and diagnostics
US5549137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1993 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Aug 25, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7761
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In this invention, a valve positioner receives a setpoint from a master and provides a control pressure to a valve actuator for controlling a valve. A sensing circuit in the positioner senses the position of the valve and the control pressure, and a control circuit in the positioner uses both the sensed pressure and position to provide a command output to a pneumatic section which produces the control pressure. In another embodiment of the invention, a positioner receives a setpoint from a master and provides a control pressure to a valve actuator for controlling a valve. A sensing circuit in the positioner senses the valve position and pneumatics in the positioner provide the control pressure as a function of the sensed position and an output from a control circuit within the positioner. The positioner includes a diagnostic circuit which stores a valve attribute and provides a diagnostic output as a function of the stored valve characteristic and a selected one of the sensed variables. In another embodiment of the invention, a positioner includes a correction circuit for storing a valve attribute affected by one of a set of physical parameters and for receiving a selected one of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.