Valve units for use in hydraulic control systems of mining equipment
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United States of America Patent
Stats
-
Nov 3, 1992
Grant Date -
N/A
app pub date -
Apr 10, 1991
filing date -
Apr 19, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A valve block in a mine hydraulic system contains a non-return valve which is opened when a hydraulic control signal occurs to connect a pressure fluid feed or return line to a working chamber of an appliance such as a prop. A auxiliary valve is mounted in the block and is operated manually to relieve the working chamber even if the non-return valve remains closed.
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Cited Art Landscape
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