Dampened hydraulic pilot control arrangement for a spool valve
US8925584B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2009 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | May 26, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86606
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic pilot control arrangement for a spool valve is provided, wherein the spool of the spool valve is biased towards a central position. The arrangement includes a first and a second pilot hydraulic line connected to opposite sides of the spool of the spool valve and a pilot pressure regulating arrangement is provided for selectively establishing or removing a pilot pressure in each of the first and second lines. The arrangement includes a damping device including a chamber divided into a first and a second pressure compartment by a sliding piston, the first and second pressure compartments being connected respectively to the first and second pilot hydraulic lines, and the piston is biased towards a rest position in the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.