Check valve
US4437485A · kind A · utility
4Cited by
7References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1982 |
| Grant date | Mar 20, 1984 |
| Priority date | — |
| Expiry date | Nov 15, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/88062
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A check valve (10) for checking reverse flow as well as excessive forward flow includes a housing (15) and a pair of valve elements (20 and 25) which are operated by flow over both inner and outer faces thereof. A first of the valve elements (20) is unseated by normal forward flow and is seated (checked) by reverse flow through the valve. The other valve element (25) is unseated by reverse flow, allowing such flow to reach the first valve element for the seating thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.