Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
January 23, 2007
Patent Application Number
10736161
Date Filed
December 15, 2003
Patent Primary Examiner
Patent abstract
A two-stage pressure relief valve for use with hydraulic systems is disclosed. The two-stage pressure relief valve has a first stage that relieves increases in hydraulic system pressure over the normal operating pressure and up to a selected threshold pressure level, and a second stage that brings the hydraulic system pressure down to a selected reduced operating pressure that is below the normal operating pressure in response to increases in the operating pressure over the threshold pressure level.
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