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:
Jun. 21, 1994
Filed:
Apr. 29, 1992
Robert L Brocx, Auburn, WA (US);
Donald L Bucey, Cle Elum, WA (US);
Red Dot Corporation, Seattle, WA (US);
Abstract
A heater circuit in a vehicle engine cooling and passenger compartment heating system comprises a control valve (26), and a supply line (22) and a return line (24) both of which are separate from the radiator circuit of the system. A bypass passageway (48) extends between the supply line (22) upstream of the valve (26) and the return line (24) downstream of the valve (26). A bypass valve normally closes the passageway (48) and opens in response to a pressure differential between the supply line (22) and return line (24) exceeding a predetermined magnitude. The passageway (48) has first and second detachably connected portions that communicate with the supply and return lines (22, 24) via radial openings (44, 46). A spring (72) abuts a shoulder (54) in the second portion and a valve element (62) that seats against a flat surface surrounding the radial opening (44) in the supply line (22). The element (62) has laterally extending guide teeth (68) and a rear reduced diameter lug (70) engaged by the spring (72). The bypass valve limits strain on the control valve, makes manual operation of the control valve easier, and enhances the consistency of control of the outlet temperature of the heater.