System and method for controlling viscosity of a fluid and a...

Power plants – Pressure fluid source and motor – Condition responsive control means responsive to – or...

Reexamination Certificate

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Reexamination Certificate

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11163182

ABSTRACT:
The invention relates to a method and system for controlling viscosity of a hydraulic fluid. The viscosity of a hydraulic fluid is usually very much dependent on temperature. By using existing throttles which generate a pressure drop, the hydraulic fluid can be heated by creating a power drain in these existing throttles through a controlled increase of the pressure through them. By controlled heating, the viscosity of a hydraulic fluid can be controlled. According to the invention, the existing throttles are preferably cavity-preventing openings in valves.

REFERENCES:
patent: 4249641 (1981-02-01), Takenoshita et al.
patent: 4354517 (1982-10-01), Zirps
patent: 4373869 (1983-02-01), Martin et al.
patent: 4798050 (1989-01-01), Nakamura et al.
patent: 5118259 (1992-06-01), Bishoff
patent: 5215444 (1993-06-01), Bishoff
patent: 1024503 (1966-03-01), None

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