Pressure vacuum breaker
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United States of America Patent
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Sep 16, 1980
Grant Date -
N/A
app pub date -
Jul 12, 1978
filing date -
Jul 12, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Excess steam pressure is relieved by displacement of a column of water through a vertical conduit opening a path for escape of steam through a space normally occupied by the water which normally acts as a seal. Under reversed conditions, air enters when the water is moved out of its sealing location by vacuum. The pressure vacuum breaker disclosed replaces flapper valves commonly used for pressure relief in paper making applications and has no moving mechanical parts.
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