Signal valve for pressure compensated system
US4727793A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1983 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Jan 24, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/8609
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A signal valve (38) is connected to a supply conduit (16) connecting a pump (11) with a control valve (14) for transmitting an artificial load signal to a load signal chamber (34) of a pressure compensated unloader valve (27) when the control valve is at an operating position and the pressure in the supply conduit (16) is below a preselected value. This moves a valve member (31) of the unloader valve (27) to a blocking position causing essentially full pump flow to be directed to the hydraulic jack for decreasing the response time in situations wherein the hydraulic jack has cavitated and no positive load pressure signal is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.