Hydraulic valve inlet unloaders
US4569367A · kind A · utility
3Cited by
4References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1985 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Jan 14, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87185
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An inlet unloader valve is provided for insertion ahead of one or more open center valve work sections having a pressure beyond port, which unloader valve has a spring biased spool, normally closing communication from the inlet to exhaust and proportionally opened by signal pressure from the pressure beyond port and the inlet and exhaust chambers to control flow through the work sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.