Method of operating a motor-controlled valve
US5152308A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Sep 30, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7761
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The closed position of a valve having a valve member that can be rotated by an electrical motor that in turn is connected to a potentiometer furnishing an output corresponding to valve position is determined by first energizing the motor so as to close the valve and monitoring the current consumption of the motor. The instantaneous current consumption of the motor is continuously or periodically compared with a set point corresponding to motor current consumption of the motor when stalled and the potentiometer output is recorded in a nonvolatile memory generally when the instantaneous motor current consumption exceeds the output so as to establish the corresponding position as the motor closed position. Then the motor is de-energized and from then on the recorded position is used as the full-closed valve position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.