Check valve
US4964423A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1989 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Aug 14, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7936
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A check valve responsive to low cracking pressures includes first and second body portions defining a valve chamber. An inlet and outlet passage communicate with the valve chamber while a valve element received therein moves between open and closed positions responsive to pressure differentials. A stop member welded to the valve body is adapted to limit the opening movement of the valve element. An axially raised central portion of the stop member abuttingly engages the valve element to limit its opening movement yet permit fluid flow around the valve element to plural openings defined in a peripheral region of the stop member. A guide member is interposed between the stop member and valve element to urge a seal member disposed on one face of the valve element toward a seated, closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.