Spill-resistant relief valve
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United States of America Patent
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Issued Date -
Nov 25, 2004
app pub date -
Oct 20, 2003
filing date -
Oct 18, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A reduced pressure backflow preventer includes a body defining a passageway for flow of fluid between a supply pipe and a service pipe; a check valve positioned in the passageway; a relief valve assembly positioned downstream of the check valve; and a stabilization device for delaying opening of the relief valve assembly. In one embodiment, the stabilization device includes a reservoir coupled to the body and configured to release fluid, thereby to delay operation of the relief valve assembly. In another embodiment, the stabilization device includes a charging device for increasing the effective volume of the region at the service side of the check valve, thereby to delay operation of the relief valve assembly.
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