Accumulator blow-back hydraulic circuit
US5020322A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1988 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Nov 8, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B20/004
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A blow-back circuit (10) comprising an accumulator (23) to build up system pressure during normal system operation and an accumulator shut-off valve (13) which prevents dissipation of the accumulator pressure during normal operation. Pressurized fluid is supplied to a fluid motor (11) through a direct drive valve (12). A directional control valve (28) is associated with a switching valve (34) and a stop mechanism (31) which mechanically feedbacks the position of a control surface to be blown back during an emergency. When the control surface is in or blown back to the neutral position, the stop mechanism (31) feeds that data back to the directional control valve (28) so that accumulator pressure will not be further delivered to the fluid motor (11) and a brake (14) will be allowed to prevent further movement of the control surface away from the neutral position. As a result, the control surface is moved to its neutral position with great accuracy and no flutter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.