Patent ID: 7604217

Claim:
An electrolysis-resistant coupling assembly for a valve within a fluid line configured for connection with a line flange, the coupling assembly comprising: a valve flange having a first mating surface and having an aperture extending therethrough, wherein said valve flange is configured to be aligned with and face the line flange for coupling thereto; a valve coupler having one end provided with an outer coupler flange, said valve flange being loaded onto said valve coupler such that said outer coupler flange passes through said aperture; and a substantially non-compressible, electrically non-conductive rigid captive ring, said captive ring being positioned against said outer coupler flange and interposed between said valve flange and said valve coupler to provide electrical separation between said valve flange and said valve coupler; wherein said valve flange is held against said captive ring when said valve flange is interconnected with the line flange.