Caterpillar Inc.
DOUBLE-CROWNED VALVE SEAT INSERT HAVING SEATING SURFACE FORMED OF HARD-FACING MATERIAL

Abstract:

A valve seat insert for a gas exchange valve controlling gas exchange of a cylinder includes an insert body having an inner peripheral surface, an outer peripheral surface, and a valve seating surface structured to contact the gas exchange valve at a closed position and profiled to limit valve recession thereof. The valve seating surface includes an arrangement of linear segments and curved segments forming crowns to contact the gas exchange valve at different wear states. The valve seat insert further includes a base material, and a hard-facing material metallurgically bonded to the base material and forming the valve seating surface.