Safety trip valve for steam or gas turbines with means to assure controlled opening from the closed position
US3987818A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1975 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | Jun 19, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86968
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A safety trip valve for interrupting the flow of working fluid to fluid operated machinery is actuated to closed position by unbalanced forces produced thereon by the pressure of the working fluid on occurrence of adverse operating conditions. After closure of the trip valve, pressure force unbalance is maintained by a pressure responsive transfer valve assembly in the trip valve which prevents sudden automatic opening of the trip valve when the adverse operation condition is corrected. A mechanical positioner in operative association with the transfer valve allows the working fluid to produce a net force in the opening direction, which causes the trip valve to follow the mechanical positioner as it is moved by the operator from closed to open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.