Valve actuator with emergency shutdown feature
US6152167A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/773
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve actuator with an emergency shutdown feature incorporates shutdown of the valve when a sensed line pressure is outside of high- and low-pressure trip points. The actuator can be manually tripped. The actuator can be tripped in the event of a fire or, incorporating a solenoid, a trip can be accomplished with an appropriate signal. Once tripped, the actuator requires manual reset. The normal open and closed operation of the valve cooperates with a clutching mechanism which is part of the trip system. The preferred embodiment of the clutching system is a torsion spring or springs which normally allow movement in one direction but not in the other unless acted upon by the tripping system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.