Quick disengaging valve actuator
US4135547A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1977 |
| Grant date | Jan 23, 1979 |
| Priority date | — |
| Expiry date | May 31, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/122
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An actuator is provided which is respondable to control fluid pressure for moving an operative means of a valve between open and closed positions. The actuator comprises a housing defining a cylindrical bore therewithin. In one form, a shaft is carried in the housing and is engagable with the operative means. Means define first and second effective piston areas and are carried by one of the shaft and the housing and are sealingly slidable along the other of the shaft and the housing, being longitudinally movable within the cylindrical bore. The apparatus has first and second fluid chambers companionly associated with the means defining the first and second effective piston areas within the bore for yielding a differential force across the means defining the first and second effective piston areas upon increase of fluid control pressure within the actuator. A continuously chargeable fluid accumulator means is in fluid communication with the second fluid chamber for storage of energy defined by fluid, preferably control fluid, compressible therein. Fluid passage means for transmitting fluid under pressure is provided to said first fluid chamber and to said accumulator means. Valve me…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.