Vacuum pressure-adjusting apparatus
US6321772A · kind A · utility
7Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Mar 20, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7796
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The air (atmospheric air) is introduced from an atmospheric port, and it is throttled to give a minute amount by means of a bleed hole. The air is introduced into a vacuum chamber via a bleed passage, and it is introduced into a pressure regulator port via a feedback passage. Further, the air is allowed to pass through a space between a seat section and a seal member of a valve plug, and it is drawn toward a vacuum port. Thus, the seal member of the valve plug to be seated on the seat section is prevented from biting into the seat section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.