Water cooling system for a marine propulsion unit

Details Water cooling system for a marine propulsion unit Water cooling system for a marine propulsion unit

1991-09-19

1994-07-19

Oberleitner, Robert J.

Marine propulsion

Means for accomodating or moving engine fluids

Cooling for engine

123 4108, B63H 2110

Patent

active

053303768

ABSTRACT:
A pressure sensitive valve device is provided for use in a cooling system for the engine of a marine propulsion unit. The pressure sensitive valve device of the invention communicates with the coolant line pressure of an engine cooling jacket at both a coolant input port region of the cooling jacket and a coolant output port region of the cooling jacket. When the difference in pressure between these two regions exceeds a predetermined limit the pressure sensitive valve device opens, thereby permitting coolant to pass therethrough. The cooling system also employs a temperature sensitive valve device positioned in parallel with the pressure sensitive valve device. The temperature sensitive valve device is operative to control coolant flow within the engine in the low RPM operation range, while the pressure sensitive valve device becomes operative to control coolant flow in the high RPM operation range, where the thermal load of the engine is great. Thus, sufficient coolant flow may be achieved throughout the entire engine operating range.

REFERENCES:
patent: 4133284 (1979-01-01), Holcroft
patent: 4357912 (1982-11-01), Brown
patent: 4457727 (1984-07-01), Flaig
patent: 4669988 (1987-06-01), Breckenfeld
patent: 4741715 (1988-05-01), Hedge

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