Gas cylinder valve with non-perforated diaphragms
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United States of America Patent
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-
May 14, 1996
Grant Date -
N/A
app pub date -
Aug 16, 1994
filing date -
Aug 16, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gas cylinder valve with minimum wetted area has a one-piece valving assembly comprising a valve member, a non-perforated diaphragm member and a valve stem, the latter including a threaded stud and a stem shaft threaded on to the stud. The threaded stud, diaphragm member and valve member are fused together by a YAG laser weld applied through a central, blind bore in the valve member. Another through weld is applied around the peripheral edge of the threaded stud. A rim on the stem shaft clamps the diaphragm outside the peripheral weld through a pair of washers which absorb the torsional load. A helical compression spring bears on a valve stem shaft shoulder outside the wetted area to bias the valve open. A resilient bushing supported by a metal cup backs up the diaphragm member.
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