Check valve
US6564828B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 2000 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Nov 16, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7937
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An rear end surface of a slide guide plate 12 extending rearward beyond a valve disc 6 is configured to abut against a rear step surface when the valve disc 6 is moving in a valve-opening direction, thus regulating a movement amount of the valve disc 6. This prevents the spring 7 from entering such an excessive compressive state that in a valve-opened state it is fully compressed. As a result, even in a case where the spring 7 is made of a synthetic resin, deterioration, due to stress relaxation, in a springing force can be suppressed, to suppress deterioration in a pressing pressure onto the valve disc 6 in the valve-closing direction, thus maintaining stable check valve functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.