Servo drive for safety and regulating valves
US5152316A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Sep 9, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7761
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Safety and regulating valves of safety stations meter energy flows in the form of gases, steam or water, in particular in thermal or industrial power plants. In a servo drive for the valves, a drive force for a safety movement of a restrictor body is derived from a working-medium pressure difference acting on the restrictor body. To this end, the spindle drive of the safety valve is constructed in such a way as to be non-self-locking. A rapid-travel mechanism is used instead of a rapid-travel motor. The rapid-travel mechanism is coupled through a non-self-locking gear unit to a planetary gear stage of the servo drive and has a shaft being normally securely braked by a releasable brake device. When the response pressure occurs, the brake device releases the rapid-travel mechanism to perform the safety movement of the restrictor body into its required position by means of the inherent medium. In a positive direction of action, the required position is the open position of the restrictor body, and in a negative direction of action the required position is the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.