Patent ID: 11873830
Assignee: JOHN CRANE UK LIMITED
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A dry gas seal to seal process gas in a compressor that includes a rotating shaft, the dry gas seal comprising:
a mating ring that can be coupled to the rotating shaft to rotate with the rotating shaft;
a primary ring that defines a seal interface with the mating ring;
a retainer ring that can be fixedly attached to the compressor; and
a carrier ring moveably coupled to the retainer ring, the carrier ring including a primary ring carrying face attached to the primary ring, a rear face and a sealing surface extending between the primary ring carrying face and the rear face;
a sealing element disposed between the retainer ring and the carrier ring;
wherein the sealing surface includes an oleophobic coating disposed thereon and that is exposed to sealing gas at a pressure that is higher than a pressure of gas in the compressor, and wherein the sealing element slides along the oleophobic coating and relative to the carrier ring as the carrier ring moves relative to the retainer ring.