Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1988-09-13
1990-02-13
Walton, George L.
Fluid handling
Processes
Cleaning, repairing, or assembling
29890129, 13724622, 228165, 251306, F16K 122, F16K 142, F16K 146
Patent
active
048997757
ABSTRACT:
An overlay for a valve disk of a butterfly or similar valve is formed from a strip of corrosion-resistant material. The strip is preferably profiled to conform to the edge of the disk and has an overall length less than the circumference of the disk. Both ends of the overlay are welded to the disk in closely spaced relation with the gap therebetween being filled by the weld metal. The disk also has a flow passage between the strip and its peripheral edge with first and second inlet ports leading from one disk face to intersect the flow passage. The inlet ports are closely spaced and lie on opposite sides of the weld. Sealant material introduced into one of the two ports flows in around the disk to form a complete seal between the disk and the overlay.
REFERENCES:
patent: 3544066 (1970-12-01), Fawkes
patent: 3619547 (1971-11-01), Cavagnero
patent: 3749359 (1973-07-01), Montesi
patent: 3958314 (1976-05-01), Kurkjian, Jr.
patent: 4141537 (1979-02-01), Daghe
patent: 4604254 (1986-08-01), Yamamoto et al.
patent: 4773625 (1988-09-01), Calvin
An article from Welding Handbook, 6th addition, Sec 1, 1968, pp. 8.3-8.8, as published in "Metal Progress", pp. 50-53, 1978.
Keystone International Holdings Corp.
Walton George L.
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