Stable position bleed valve with O-ring detent

Details Stable position bleed valve with O-ring detent Stable position bleed valve with O-ring detent

1990-01-24

1991-08-06

Look, Edward K.

Power plants

Pressure fluid source and motor

Pulsator

137461, 251297, 188352, B60T 1548, F16K 1518, F16K 1504

Patent

active

050366661

ABSTRACT:
The bleed valve (22) especially for a hydraulic brake circuit, comprises a fluid reservoir (20), a hydraulic motor (26) and a mechanism for putting the fluid under pressure (24), and has a first port (42) connected to the motor (26) and to the mechanism (24) by way of a first conduit (62) and a second port (54) connected by way of a second conduit (60) to the reservoir (20) which is likewise connected to the inlet of the mechanism (24) by way of a third conduit (64), the first and second conduits (60,62) communicating with one another by way of the valve (22) during the initial bleeding phase of the hydraulic circuit, and no longer communicating from the moment when the fluid is first put under pressure. The valve (22) comprises a piston (36) capable of sliding in a bore (32,34) and keeping the shutter (44,42) of the valve open during the bleeding phase counter to a compressed spring (46 ). The bore (32,34) is stepped, and a flexible annular ring (48) is arranged in an annular groove (50) formed on the periphery of the piston (36) and interacts with a slope (52) consisting of the intermediate part between the two parts of the bore (32,34), in order to keep the piston in the stable initial position as long as the pressure of the fluid in the hydraulic circuit is below a specific threshold.

REFERENCES:
patent: 2996046 (1961-08-01), Skopp et al.
patent: 3072149 (1963-01-01), Hasbany
patent: 3166990 (1965-01-01), Hoffman
patent: 3434493 (1969-03-01), Owens
patent: 3789611 (1974-02-01), Marquardt
patent: 4116004 (1978-09-01), Geary
patent: 4257315 (1981-03-01), Tisell et al.
patent: 4831826 (1989-05-01), Belart et al.
patent: 4902077 (1990-02-01), Belart et al.

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