Control device for a hydraulically operated consumer
US4051868A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1976 |
| Grant date | Oct 4, 1977 |
| Priority date | — |
| Expiry date | Mar 23, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87185
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention relates to a hydraulic control valve assembly, or a plurality of control valve assemblies, for controlling one or more consumer units such as hydraulic motors. Each valve assembly has conventional supply and exhaust ports for selectively and alternately pressuring and exhausting two ports to which a consumer unit is connected. Each valve assembly has pressure sensing control ports which sense pressure in the consumer unit ports. Conduit means connected to the control ports include a pressure differential regulator which shunts the supply pressure and which reacts to pressure supplied to the consumer unit to control the regulator. In a preferred embodiment comprising a plurality of control valve assemblies and associated consumers and a common pressure differential regulator, the individual sensing conduits of all control units are connectable at one end to the return conduit in the neutral position and are combined at the other end to form a collecting sensing conduit. The collecting sensing conduit is connected to the return conduit by a relief line which is open at least in the neutral position of the control slide. Each individual sensing unit contains a check valv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.