Check valve, especially for vacuum-operated installations in motor vehicles
US4129143A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Jun 22, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7783
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A check valve, especially for vacuum-operated installations in motor vehicles, which includes a two-partite housing and a roller diaphragm secured between the housing parts provided with inlet and outlet channels; the roller diaphragm which is pressed against its sealing seat by a prestressed spring, cooperates by means of its ring-shaped, curved diaphragm portion as movable sealing part with the bottom of one housing part constructed as sealing seat in such a manner that a central bore provided in the section of the roller diaphragm located on the side of the spring, connects the inlet channel terminating outside of the curved diaphragm portion with the outlet channel of the housing part, when the curved diaphragm portion lifts off from the sealing seat upon exceeding a predetermined differential pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.