Jet pump with improved control valve and pressure relief valve therefore
US6068022A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1999 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Aug 25, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7929
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A jet pump includes a jet pump nozzle and a pressure relief valve. The pressure relief valve includes an inlet, a valve seat around the inlet, and an unregulated outlet downstream of the valve seat. A valve member is mounted in the valve body to move between a closed position and an open position, and a spring reacts against the valve body to bias the valve member to the closed position. The valve seat defines a first area A1, the valve member defines a second area A2, and the ratio A2/A1 is selected to provide a hysteresis between opening and closing pressures as measured at the inlet of at least 6 psi. This hysteresis improves efficiency of operation of the jet pump nozzle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.