Importance

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Abstract

A disc valve with a disc that is pivotable between open and closed positions has a metallic seal ring placed against an axially-oriented face formed by the housing and located at the ends of an enlarged conduit portion between the face and one of the ends of the housing. A three-part retainer ring which includes a main body located opposite the seal ring and a flange which extends radially outward from the main body and snugly fits into a groove in the housing is defined by at least three retainer ring segments. At least one of the retainer ring segments includes parallel ends which are opposite correspondingly parallel ends formed by the adjoining retainer ring segments so that this one segment can be radially moved past the other segments. Each segment includes one or more threaded bolts to generate an axially acting pressure against the seal ring, securely install the seal ring and bias it into sealing engagement with the housing face to prevent leakage therebetween when the disc is closed and one of its sides is subjected to fluid pressure. The axially acting pressure generated by the threaded bolts is transmitted from the main body of each retainer ring segment via the associated flange to the housing. Axially oriented locking pins prevent unintentional relative radial movements between the retainer ring segments.

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First Claim