Pressure compensator device for proportional type hydraulic distributor and hydraulic distributor incorporating same
US4842019A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Aug 2, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/88054
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A proportional type hydraulic distributor incorporates a distributor slide valve including a feed chamber. It is provided with a pressure compensator device for regulating the feed pressure to the feed chamber according to the output (load) pressure of the slide valve. This device includes an inlet channel, an outlet channel communicating with the feed chamber and a stator communicating with the inlet and outlet channels. A compensator slide valve slides in a housing in the stator. A spring exerts an axial force on the compensator slide valve in the same direction as the force exerted on it by the output pressure and in the opposite direction to the force exerted on it by the feed pressure. An annular obturator member on the compensator slide valve isolates the inlet and feed channels and is acted on by a return spring on the compensator slide valve. The latter has a recessed part on which the obturator member slides without clearance. The obturator member slides between two abutment members and inside a cylindrical bore into which the feed channel opens. A chamber at the back of the housing contains the return spring and there is a passage through which the chamber communicates at…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.