Valve stem and gasket with improved cleaning capability
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United States of America Patent
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-
Aug 14, 1990
Grant Date -
N/A
app pub date -
Nov 13, 1989
filing date -
Nov 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve assembly includes a gasket trapped between spaced apart flanges of a valve stem. The gasket is worked over one flange, causing one end of the gasket to deflect with the cross-section undergoing a rolling motion. Upon passing the flange the deflected end of the gasket resumes its normal size, thereby remaining captive between the valve stem flanges. The valve stem flange and the gasket have recesses formed therein for visual inspection of hidden surfaces, useful to evaluate flush cleaning performed on the valve assembly. The gasket internal bore and the valve stem body extending between the flanges have complementary cross-sectional configurations. The gasket has a tapered bore to aid in insertion on the valve stem and the recesses are part conical, terminating at an intermediate point along the gasket bore. The gasket is dimensioned to float in radial and axial directions when mounted on the valve stem.
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