Control valve having an actuating drive and method therefor
US5669413A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1996 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Apr 23, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86984
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A valve apparatus for controlling a pressured fluid, in which the shut-off device is force closed by the pressured fluid which is admitted into a chamber via a throttle bore. The valve is opened via a drive means, which acts directly on both a pilot valve and on the shut-off device, without the interposition of an actuating fluid. The drive means first opens a pilot valve, thereby allowing the pressured fluid to escape from the chamber and to the outlet. The drive means then opens the shut-off device. The reduction in pressure in the chamber enables a drive means of only moderate power to complete the second step of opening the shut-off device. The drive means acts directly on the shut-off device; thus the control action corresponds directly to the stroke displacement of the drive means at any particular moment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.