Valve for controlling liquids
US6705544B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Jul 12, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/703
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve (1) for regulating fluids has a piezoelectric unit (4) for actuating a valve member (3). The valve member is embodied with a control piston (9), adjacent to the piezoelectric unit (4), and with at least one actuating piston (14), adjacent to a valve closing member (15). A hydraulic chamber (16) functioning as a hydraulic booster is disposed between the pistons (9, 14). The valve closing member (15) cooperates with at least one valve seat (18, 19) and divides a low-pressure region (20) from a high-pressure region (21). An electric control unit (12) specifies the trigger voltage for the piezoelectric unit (4) as a function of the pressure level in the high-pressure region (21), a leakage loss from the low-pressure region (20) and the hydraulic chamber (16), and the refilling of the low-pressure region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.