Patent ID: 6210487
Filing Date: 2001-04-03
Classification: C23C

Abstract:
For use in a chemical delivery system to a rotating tubular member having a stationary delivery tube, a sealing arrangement for sealing the tubular member to control chemical leakage, said sealing arrangement comprising:a supply coupling member having a first extension thereon having a first end insertable into the tubular member and having a bore for passage of the chemicals being supplied to the tubular member;a secondary sealing member mounted on said first extension spaced from said first end and having a diameter such that it is adapted to make sealing engagement with the inner wall of the tubular member;a secondary sealing nut mounted on said first extension for holding said secondary sealing member on said first extension, said secondary nut having a second extension thereon having a first end adapted to bear against said secondary sealing member and a second end;a primary sealing member mounted on said second extension of said secondary nut intermediate the first and second ends thereof, said primary sealing member having a diameter such that it is adapted to make sealing engagement with the inner wall of the tubular member;said primary sealing member being spaced from said secondary sealing member to create a sealed buffer zone therebetween;a primary sealing nut mounted on said second end of said second extension on said secondary sealing nut for holding said primary sealing member on said second extension;said secondary sealing nut and said primary sealing nut each having a direction of rotation for tightening which is the same as the direction of rotation of said tubular member.