Control valve
US4617958A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1985 |
| Grant date | Oct 21, 1986 |
| Priority date | — |
| Expiry date | Jul 25, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/777
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
To provide pressure regulation, limit pressure rise rate and control the speed of a fluid operated system with a control valve, a pilot operated valve member is in communication with a fluid passageway on both the inlet and outlet sides of a butterfly valve. The pilot operated valve member is also in communication with an actuator operable to move the butterfly valve between a closed position and an open position dependent upon fluid pressure on the inlet side and outlet side of the butterfly valve. By utilizing fluid pressure signals delivered to three separate chambers, the pilot operated valve member is capable of controlling valve opening ramp rate, pressure variations within the limit of a set point, and adjustability of the set point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.