Control valve assembly including valve position sensor
US4809742A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1988 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Apr 18, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8242
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electromechanical valve assembly incorporates an electromechanical actuator, such as a limited angle torque motor or solenoid, to open or close the valve in response to a direct current or low frequency electrical signal. A valve position sensor detects the valve position in response to a second, relatively high frequency electrical signal. The actuator and sensor are electrically connected in parallel so that the valve may be actuated and the valve position may be determined through a single pair of electrical leads. The position sensor preferably includes an electrical coil having a reactance that varies with incident magnetic flux, the magnitude of which depends on valve position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.