Automatic air-vent valve for hydraulic systems
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United States of America Patent
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-
Apr 11, 2000
Grant Date -
N/A
app pub date -
Jun 19, 1998
filing date -
Jul 28, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bleeder valve comprising a housing including a sensor device of material which is optically denser than gas arranged between a light transmitter and a photo-electric receiver, at least one external surface of the sensor device being disposed in a space to which gas or hydraulic fluid is admitted; when gas is in contact with the external surface, light reaches the receiver and when hydraulic fluid is in contact with the surface, light does not reach the receiver, an output signal is generated by the receiver which causes a magnetic valve to open until gas is exhausted.
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