Patent ID: 6402602
Filing Date: 2002-06-11
Classification: B24B

Abstract:
A rotary union for mounting to a rotating element having an element bore wall defining an element bore of preselected size, the rotary union maintaining semiconductor wafer treatment fluids in an ultra pure condition, the rotary union comprising:a union stator having a support face; a union rotor having a support face and an opposed mounting face adjacent the rotating element; at least one mount for movably mounting the union rotor toward and away from the rotating element; the union rotor defining a union bore of smaller size than said element bore; a spring bias between said union rotor mounting face and said rotating element, biasing said union rotor away from said rotating element; a face seal between said union stator support face and said the union rotor support face, said face seal in the form of a flat washer and comprised of expanded PTFE material; and said union rotor defining a passageway for the semiconductor wafer treatment fluids, said passageway extending from said union rotor support face to a portion of said union rotor mounting face radially interiorly of said element bore wall.