High pressure hydraulic systems
US4390188A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Apr 28, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/88054
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a high pressure hydraulic system wherein a source supplies pressurized fluid to a slave unit through a control valve operative to maintain the slave unit in a desired condition, leakage from the slave unit past the control valve when the source is inoperative is prevented by a control valve comprising two solenoid-operated valves, oppositely acting and arranged in series between the source and the slave unit, each valve being closed to prevent flow through the valve in a direction towards the other valve and opened to permit flow in both directions, under the control of a solenoid and the pressure differential acting across the valve. A seating portion on the valve located between the other valve and the slave unit is of elastomeric material to provide a leakproof seal when that valve is closed. In the construction shown the slave unit is an hydraulic suspension strut, and the system is adapted as a vehicular suspension levelling system, with the valves and the source being manipulated as required by an electronic control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.