Patent ID: 7451780
Filing Date: 2008-11-18
Classification: F16K,Y10T

Abstract:
1. A valve apparatus for use in regulating the flow of fluid between a first fluid side and a second fluid side in a hydraulic component, comprising: a valve seat having a head portion adapted to sealingly engage a passage in the hydraulic component between the first and second fluid sides and a body portion extending from the head portion to an opening at a second end thereof, the valve seat forming a first internal volume and having a first opening formed in the head portion to permit fluid communication between the first internal volume and the first fluid side and having at least one second opening formed in the head portion to permit fluid communication between the first internal volume and the second fluid side, the valve seat further having at least one bore formed in the body to permit fluid communication between the first internal volume and the first fluid side; a valve sleeve slidably disposed in the first internal volume, the valve sleeve having an opening at a first end and an external base at a second end thereof, the valve sleeve forming a second internal volume and having an internal base portion with a least one opening to permit fluid to pass into and out of the second internal volume, the valve sleeve movable with respect to the bore in the body of the valve seat; a relief poppet slidably disposed in the first internal volume, the relief poppet having a head adapted to sealingly engage the first opening in the head portion of the valve seat and having a body portion at least partially located inside the second internal volume; a relief compression spring located inside the second internal volume and disposed around the body of the relief poppet, wherein the relief compression spring engages the head of the relief poppet and the internal base of the valve sleeve; a valve guide attached to the second end of the valve seat, having a first end for said attachment, a second end, and an internal passage between the first and second ends, wherein the internal passage is fully open to the first end and open to the second end through a smaller diameter opening to permit fluid communication between the internal passage and the first fluid side; and an accumulator piston slidably mounted within the internal passage of the valve guide, wherein the accumulator piston cooperates with the internal passage of the valve guide to define an accumulator volume.