Patent ID: 7946506
Filing Date: 2011-05-24
Classification: F15B,F16K,G05D,Y10T

Abstract:
1. A hydraulic fluid heating apparatus including a body having an inlet for high pressure fluid, 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, a restriction in the flow path between the inlet and the chamber through which restriction the high pressure fluid is constrained to pass whereby the apparatus becomes heated, and an orifice through which the working fluid flowing from the inlet to the chamber must pass, a linearly acting closure structure, the closure structure being urged by a resilient device to a position in which the closure structure closes the orifice when the pressure of the high pressure fluid is below a threshold pressure, and wherein the closure structure includes a thermally sensitive material which expands in response to increasing temperature to cause the closure structure to close the orifice in response to the thermally sensitive material sensing a temperature above a threshold temperature, and wherein the high pressure fluid is a working fluid, and the body includes an inlet for lower pressure system fluid, the working fluid, after passing through the restriction, combining with the system fluid, and the working fluid and system fluid flowing to a common outlet from the body.