Seal for wear resistant inserts
AssigneeMobil Oil Corporation
InventorRaymond C. Searles
Life of this patent
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Abstract
In a pressure let-down valve comprising a fixed choke and a variable choke means, a silver solder joint between the wear-resistant insert and the retaining ring is replaced by a mechanical joint. The mechanical joint is comprised of a split-locking ring, preferably consisting of two separate segments, fitting into an annular outwardly opening channel in the wear-resistant insert. The split-locking ring is fastened to the retaining ring to lock the wear resistant insert into place.
Claims13
In a pressure let-down valve comprising a valve body and a variable choke within said body, said variable choke comprising a fixed disc assembly and a rotating disc assembly, said rotating disc assembly comprising a retaining ring and a wear-resistant insert means affixed to said retaining ring,
- an improvement wherein:
- said wear-resistant insert means is attached to said retaining ring by a split locking ring means containing a fastening means in the front surface thereof.
A pressure let-down valve comprising a valve body and a variable choke within said body, said variable choke comprising a fixed disc assembly and a rotating disc assembly, said rotating disc assembly comprising a retaining ring and a wear-resistant insert means affixed to said retaining ring, an improvement wherein:
- said wear-resistant insert means is attached to said retaining ring by a split-locking ring means,
- said split-locking ring means comprises two substantially semicircular segments, said split locking ring means being fastened to said retaining ring by screw fastening means,
- said retaining ring and said split locking ring means are substantially circular in shape,
- said wear-resistant disc is made of tungsten carbide, silicon carbide or ceramic, and it has an annular outwardly opening channel on the perimeter thereof, said channel receiving said split locking ring means.
Dependencies are inferred from the claim text.