Pressure medium valve
US4905959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Oct 27, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B13/0405
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Pressure medium valve having a valve piston located in a valve housing for control of a main pressure medium flow through the valve by the aid of a pilot flow through a variable pilot flow restriction disposed in the valve piston, the pilot flow being derived from the main pressure medium flow and being controllable by means of a control pilot valve. To achieve temperature independent control without area increase in the pilot flow chambers, an additional restriction between the valve piston and the cylindrical wall surrounding the valve piston of the valve housing is incorporated. The additional restriction has the form of a peripheral clearance of a substantially greater axial length than height.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.