Self-monitoring dual-spool servovalve
US4338965A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1980 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Jun 2, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87209
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved electrohydraulic servovalve has first and second valve spools mounted for independent sliding movement relative to a body in response to a common command signal. The valve has a first drive mechanism operatively arranged to cause a desired motion of one valve spool in response to the command signal, and has a second drive mechanism operatively arranged to cause a desired simultaneous similar motion of the other valve spool in response to the command signal. The improvement comprises a differential position sensing mechanism arranged to sense the relative positions of the two valve spools and operative to produce an output related to the difference therebetween, and an indicating device supplied with such output and operative to indicate substantially dissimilar relative positions of the spools.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.