Gas spring actuator
US5140894A · kind A · utility
13Cited by
13References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1991 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Jan 16, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/122
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gas spring actuator which, when attached to a valve, will return the valve to its initial position after the valve has been moved to a second position by application of a pressurized fluid that opposes the gas spring. The gas spring is charged to a predetermined gas pressure. A hydraulic fluid is applied in an opposing manner to drive the piston in one direction to operate the valve and simultaneously pressurize the gas in the gas spring. Upon removal of the hydraulic pressure, the pressurized gas returns the piston, and the valve, to its initial position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.