Method for manufacturing a single-piece type valve sleeve
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United States of America Patent
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-
Sep 6, 1988
Grant Date -
N/A
app pub date -
Feb 24, 1987
filing date -
Feb 24, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for manufacturing a single-piece type valve sleeve, includes plastic-working a workpiece thereby to form in the workpiece a blind bore and a plurality of grooves in the surface of the bore and extending lengthwise of the bore, plastic-working a portion of the workpiece at the bottom of the bore so as to form a through hole in the workpiece, and plastic-working an inner portion of the workpiece adjacent the mouth of the bore thereby to close one end of the grooves. A single-piece type valve sleeve is produced by the method.
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