Actuator
US4129283A · kind A · utility
10Cited by
9References
4Claims
0Family size
Inventor
Key dates
| Filing date | Nov 3, 1976 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Nov 3, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/1223
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gate valve operator having dual pistons, one having pilot pressure acting thereagainst thereby tending to open the valve, and one having line pressure acting thereagainst tending to close the valve. The line pressure piston's pressure surface area may be varied to compensate for wells having depleted pressure, and line pressure at all times tends to close the valve, i.e., the actuator is unbalanced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.