Flowmeter-controlled valving
US4679585A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 10, 1986 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Jan 10, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86421
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electrically-actuated fluid-flow control valve employed to establish and maintain prescribed flow conditions with the aid of a fast-response flowmeter is caused to operate swiftly, accurately and reliably by way of unique electrical circuitry which selectively enhances responses to low-level signals and cooperatively induces electromechanical oscillations offsetting hysteresis of the valve armature suspension. In a preferred context of a system wherein a thermal flowmeter is used to actuate a solenoid valve and thereby cause actual flow conditions to agree with those prescribed by operator-controlled settings, normal sluggishness of responses to low-level electrical signals is overcome by circuitry which under appropriate circumstances automatically exercises logic to command that the valve be disproportionately energized to effect immediate strong action which will reliably and quickly bring about intended and accurate change in flow. Within the valve itself, where unavoidable hysteresis associated with the spring suspension for the armature would otherwise tend to interfere with precision of control, corrective mechanical armature oscillation is advantageously induced at a sui…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.