Diaphragm valve
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United States of America Patent
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-
Jan 1, 1980
Grant Date -
N/A
app pub date -
Mar 17, 1977
filing date -
Mar 17, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A diaphragm valve includes an apertured diaphragm plate that separates mutually concentric input and output valve chambers. A flexible diaphragm extends somewhat loosely across the plate and seals an operating chamber on one side of the plate. The chamber contains a spring pressed retainer plate having a sealing lip bearing against, but otherwise unsecured to, the diaphragm so that by controlling pressure within the operating chamber, the primary sealing closure is broken and the retainer plate apertures may be progressively blocked or unblocked as the diaphragm moves to and from the diaphragm plate apertures.
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