Patent ID: 8360096

Claim:
A relief valve for a hydraulic device comprising: a poppet matingly and detachably connected to a pilot wherein the poppet moves relative to the pilot; a poppet spool disposed within the poppet and having internal passageways including a radial passageway that intersects an axial passageway disposed therein; a pilot spool disposed within the pilot and having internal passageways including a radial passageway that intersects an axial passageway disposed therein; wherein the internal passageways of the pilot spool are fluidly connected to the internal passageways of the poppet spool to provide fluid communication from a first area to a second area disposed between the poppet and the pilot and restrict fluid flow into the second area as the internal passageways of the poppet spool begin to close as the pilot spool and poppet spool move axially toward the pilot in response to an increased pressure in the first area; and wherein an axial movement of the poppet is regulated by an axial position of the radial passageway within the poppet spool to maintain a constant differential pressure acting on the poppet regardless of the fluid flow through the valve.