Remote valve operators
US4569372A · kind A · utility
3Cited by
11References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1984 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Aug 28, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8663
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A remote valve positioning apparatus is provided in which a valve spool is resiliently loaded at each end to a normal position, hydraulic fluid is delivered selectively to one end or the other of the valve spool at a fixed flow and the valve is positioned by pressure drop caused by the fixed flow over an orifice proportional to the stroke of the valve spool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.