Tandem pump valve structure
US7677263B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2006 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | May 19, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86702
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
When the pressure in a main fluid supply channel is lower than a no-load operation start pressure, the spool moves against the biasing force of a biasing member, and the area of opening of a auxiliary fluid supply channel is reduced with regards to opening of the internal flow channel. When the pressure in the main fluid supply channel rises and reaches a no-load operation start pressure, the area of opening in the auxiliary fluid supply channel with regards to opening of the internal flow channel becomes smaller and while connected to the main fluid supply channel, the auxiliary fluid supply channel is connected to the return flow channel. When the pressure in the main fluid supply channel rises above the no-load operating start pressure and reaches a no-load operation pressure, the auxiliary fluid supply channel is cut off from the main fluid supply channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.