Metering control valve and fluid power system
US4132153A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1976 |
| Grant date | Jan 2, 1979 |
| Priority date | — |
| Expiry date | Nov 9, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87322
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid power system including a fluid power cylinder having a piston and fluid ports at its opposite ends, a directional valve for selecting the direction of piston actuation, and a metering control valve coupled between the directional valve and the cylinder. The control valve includes a cylinder section having a control piston therein and a valve body connected to the cylinder section and having a valve spool-receiving cavity therein. The valve body has first and second fluid ports therein communicating with the cavity, one of the valve body ports being coupled to one of the power cylinder ports and the other being coupled to the directional valve. A valve spool is disposed in the valve body cavity operatively connected to the control piston and movable therewith, the spool having a passage therein. The spool passage communicates with the valve body ports and provides unrestricted fluid flow therebetween in a first spool position and substantially restricts fluid flow between the valve body ports in a second spool position, movement of the spool between its positions progressively metering the fluid flow between unrestricted and substantially restricted conditions. The spool pas…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.