Hydraulic heating apparatus
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United States of America Patent
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May 24, 2011
Grant Date -
Jan 29, 2009
app pub date -
Jun 15, 2008
filing date -
Jun 15, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic heating apparatus includes a body having an inlet for high pressure fluid, and an outlet for heated fluid, a chamber within the body and a flow path for the high pressure fluid between the inlet and the chamber. The high pressure fluid flows through a restriction in the flow path between the inlet and the chamber whereby the apparatus becomes heated. The working fluid flowing from the inlet to the chamber must pass through an orifice which is closable by a linearly acting closure structure. The closure structure is urged to a position in which the closure structure closes the orifice when the pressure of the high pressure fluid is below a threshold pressure. The closure structure includes a thermally sensitive material which expands in response to increasing temperature to close the orifice in response to a temperature above a threshold temperature.
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