Oil drain device for valve spool cap
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United States of America Patent
Stats
-
Aug 12, 1997
Grant Date -
N/A
app pub date -
Jun 30, 1995
filing date -
Sep 29, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for draining oil out of a valve spool cap is disclosed. The device makes the oil start to drain out of the spool cap just after the valve spool starts to move thereby remarkably improving the responsibility of the spool. The valve body has either an enlarged inner diameter portion formed in the bore or a drain hole extending in the body for making the drain core communicate with the inside of the spool cap. The enlarged inner diameter portion is formed by partially enlarging the inner diameter of the bore between the drain core and the end wall of the valve body. The drain hole extends in the valve body from the drain core to the end wall of the valve body.
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