Valves
US4643392A · kind A · utility
0Cited by
12References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Jan 14, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87113
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A valve for use in controlling a plurality of fluid operated functions, for example the functions of a hydraulic mine roof support, comprises a valve body 10, a plurality of valve members 13 each movable independently to carry out a fluid flow control function, a plurality of valve actuating members 21, movable in a direction tending to actuate the valve members 13, and an interposer device 25 movable to prevent at least one of the valve actuating members 21 from actuating its associated valve member 13, thus enabling the valves to be selectively operable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.