Patent ID: 6964280
Filing Date: 2005-11-15
Classification: F16H,F16K,Y10T

Abstract:
1. A combination check valve and pressure relief valve for use in regulating the flow of fluid through a valve opening between a first fluid side and a second fluid side in a hydraulic circuit, comprising: a valve plug; a valve guide moveably positioned in relation to the valve plug; a valve stem engaged to the valve guide; a valve seat carried by the valve stem and engaged to the valve opening, the valve seat comprising a valve seat body having a first end and a second end, a first opening formed in and extending through the valve seat body, wherein the valve stem extends through the first opening, and a plurality of ribs located on the second end and arrayed about the first opening; a relief compression spring positioned between the valve seat and the valve guide, wherein the valve guide moves the valve stem relative to the valve seat against the force of the relief compression spring to allow fluid to pass from the first fluid side to the second fluid side through the entire length of the first opening; and a check compression spring positioned between the valve guide and the valve plug, wherein the valve seat, valve stem, and valve guide move relative to the valve plug against the force of the check compression spring to move the valve seat from the valve opening to permit fluid to pass from the second fluid side to the first fluid side through the valve opening.