Pilot-operated proportional pressure limiting valve
US5979862A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Jul 3, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87209
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A pilot-operated proportional pressure limiting valve with a pilot valve, with a main piston which can be acted on in closing direction by pressure prevailing in a control chamber and in opening direction by pressure prevailing in an inlet, with a control oil nozzle device between the inlet and the pilot valve and with a damping nozzle device between the control chamber and the pilot valve, wherein the total hydraulic resistance of the damping nozzle device is variable as a function of the stroke of the main piston. The damping nozzle device comprise a radial hole in the main piston, and in the closed position of the main piston the radial hole debouches towards the outside in the region of a radially narrow annular slot and, after a given stroke of the main piston, in the region of a radially wide annular slot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.