Accumulator blow-back hydraulic circuit

Details Accumulator blow-back hydraulic circuit Accumulator blow-back hydraulic circuit

1988-11-08

1991-06-04

Look, Edward K.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60406, 60413, 91 33, F15B 102, F15B 2000

Patent

active

050203223

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.

REFERENCES:
patent: 2804753 (1957-09-01), Leduc
patent: 3651642 (1972-03-01), Bauch et al.
patent: 3662550 (1972-05-01), Lichtfuss
patent: 3680311 (1972-08-01), Harbonn et al.
patent: 3898809 (1975-08-01), Baker
patent: 4065094 (1977-12-01), Adams
patent: 4217968 (1980-08-01), Dezelan
patent: 4326558 (1982-04-01), Gage
patent: 4422290 (1983-12-01), Huffman
patent: 4476677 (1984-10-01), Hanshaw

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