Abstract: A non-sticking, field replaceable valve seat and pallet assembly for use in a pressure vacuum relief valve. The valve seat is adapted for positioning within a valve orifice inside the valve housing. The valve seat has three guide vanes spaced around and radiating inwardly from an inner wall of the valve seat, the guide vanes each having a tip. The pallet includes a pallet disc for sealingly engaging the valve seat and a cylindrical guide stem, a lower portion of which extends below the pallet disc for riding between the tips of the guide vanes. Both the valve seat and the lower portion of the guide stem are located "inside" the process where they are less apt to freeze. The distance between adjacent guide vane tips is less than the diameter of the guide stem; thus, the guide stem is prevented from moving out from between the guide vanes.