Regulating nozzle with adjustable effective area baffle
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United States of America Patent
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-
May 17, 1994
Grant Date -
N/A
app pub date -
Mar 25, 1993
filing date -
Mar 25, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A nozzle including a tubular nozzle body forming a centrally located liquid flow path, the body having an inlet end and an outlet end. Mounted centrally in the body within the flow path is a pressure-regulating mechanism including an axially located dual-pressure baffle. The baffle is located at the outlet end and forms a nozzle gap with a throat surface of the body. During operation, a spring biases the baffle to close the gap and the liquid pressure on the baffle operates to open the gap. Adjustably mounted on the baffle is a shield which is movable relative to the baffle between a normal pressure position and a low pressure position. In the normal pressure position, the shield forms a gap size appropriate for a normal supply pressure. In the low pressure position, the shield forms a gap having an increased size appropriate for a supply pressure which is substantially less than the normal supply pressure. In addition to changing the gap size, adjustment of the shield also changes the effective area over which the water pressure acts on the baffle. Apparatus is provided for increasing the effective baffle area during operation in the low pressure position, whereby the water pressure further increases the size of the gap.
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