Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Bradley L. McCafferty0
Charles F. Long0
Mark A. Rader0
Date of Patent
May 5, 2009
0Patent Application Number
112189810
Date Filed
September 2, 2005
0Patent Primary Examiner
Patent abstract
A hydrodynamic retarder control apparatus includes two valve spools, one, a retarder control valve, functions as a relay valve to control the on/off operation of a hydrodynamic retarder and the other, a regulator valve, functions to control the regulation of pressure at the hydrodynamic retarder. During abnormal periods of operation of the regulator valve, the retarder control valve will also function as a pressure control valve thereby limiting the maximum pressure at the hydrodynamic retarder.
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