Oil return valve
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United States of America Patent
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Issued Date -
Oct 13, 2005
app pub date -
Apr 7, 2004
filing date -
Apr 7, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An oil return valve threaded into the casing of the hydraulic system of a hydraulic jack for controlling the flow rate of return oil is disclosed to have a tapered front eng engaged into an oil hole between the inner oil cylinder and outer oil cylinder of the hydraulic system so that rotating the oil return valve forwards/backwards relative to the casing causes variation of the oil passage for return oil between the outer oil cylinder and the inner oil cylinder.
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