The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 1994
Filed:
Sep. 19, 1991
Shigeo Okumura, Hamamatsu, JP;
Sanshin Kogyo Kabushiki Kaisha, Hamamatsu, JP;
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.