Dry hydrant check valve
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United States of America Patent
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-
Apr 23, 1996
Grant Date -
N/A
app pub date -
Jan 12, 1994
filing date -
Jan 12, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dry (unpressurized) hydrant utilizes a hydrant pipe wherein a submerged end carrying a strainer assembly is placed at a predetermined depth within a body of water, such as a lake or a pond, with the unsubmerged end being located above ground adjacent the water surface. A check valve installed behind the underwater strainer allows the pipe to be filled with water delivered from a tank onboard a pumper truck. Flooding the pipe in this manner allows the pumper truck to then pump water from the lake or pond, through the hydrant, with little or no priming necessary so as to meet fire suppression demands. A vent valve located on the pumper intake connected to the unsubmerged end allows air to escape from the pipe during the filling process. In a further embodiment, a bypass system enables the strainer to be periodically back-flushed, without removal of the strainer, through the provision of a bypass check valve which opens in the reverse direction from the main check valve at a pressure greater than the normal filling pressure.
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