Automatic adjusting valve for controlling fluid flow
US4572238A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1983 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Dec 22, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87217
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A controlled sliding valve comprises a valve housing with a cylindrical bore, in which a slide controlling a hydraulic flow reciprocates by an adjusting force, the sealing surfaces between the slide and bore form a sealing gap converging in the flow direction, and the amount of flow is controlled between a throttling edge and longitudinal control grooves (7, 8;44) in the slide with variable cross-sectional area in the direction of movement of the slide, and a centering spring retains the slide in closing position. In order to obtain low adjusting forces, to control the volume so as to be substantially constant and independent of the pressure drop over the valve, and to maintain low leakage past the slide, the valve housing includes a central chamber (6) provided with a port (3), and on both sides of the central chamber two control chambers (9, 10) with ports and each with a sealing gap (11, 12) spaced from each other. The central chamber (6) and either of the two control chambers (9,10) communicate in all adjustment positions with the control grooves (7,8), which can be caused to open to only one of the sealing gaps (11 or 12) at a time. The centering spring (13) centers the slide …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.