Valve construction
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United States of America Patent
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-
Jan 21, 1997
Grant Date -
N/A
app pub date -
Mar 9, 1995
filing date -
Mar 9, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solid valve spool is split in two, by cutting through its center land diameter. A drill rod spacer is machined to length and inserted between the spool pieces to establish a spool assembly having a precise land width. The spool pieces and spacer are biased together in assembly so as to travel in unison, within a valve bushing, when shifted to control fluid flow, and the precisely-spaced land edges serve to pinch off fluid flow.
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