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:
Oct. 23, 2012
Filed:
May. 07, 2009
Scott F. Shafer, Morton, IL (US);
Jeffrey Depayva, Dunlap, IL (US);
Daniel R. Puckett, Peoria, IL (US);
Amy S. Johanson, Normal, IL (US);
Kenneth C. Adams, Dunlap, IL (US);
Benjamin R. Tower, Varna, IL (US);
Jason Z. LI, Peoria, IL (US);
Jayaraman Venkataraghavan, Dunlap, IL (US);
Michael D. Gerstner, Peoria, IL (US);
Michael C. Long, Metamora, IL (US);
Scott F. Shafer, Morton, IL (US);
Jeffrey DePayva, Dunlap, IL (US);
Daniel R. Puckett, Peoria, IL (US);
Amy S. Johanson, Normal, IL (US);
Kenneth C. Adams, Dunlap, IL (US);
Benjamin R. Tower, Varna, IL (US);
Jason Z. Li, Peoria, IL (US);
Jayaraman Venkataraghavan, Dunlap, IL (US);
Michael D. Gerstner, Peoria, IL (US);
Michael C. Long, Metamora, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A pressure relief valve includes a valve body having a valve seat fluidly positioned between an inlet and an outlet. A valve member is movable among a first position, a second position, and a third position. The valve member is in contact with the valve seat and fluidly blocks the inlet from the outlet at the first position. At the second position of the valve member, the inlet is fluidly connected to the outlet via a small flow area. The inlet is fluidly connected to the outlet via a large flow area when the valve member is at the third position. An electrical actuator is attached to the valve body and is operably coupled to move the valve member when energized. The valve member includes an opening hydraulic surface exposed to fluid pressure in the inlet when at the first position. A spring is operably positioned to bias the valve member toward the second position when the valve member is at the third position.