Fluid handling – With casing – support – protector or static constructional... – Jacketed
Patent
1986-04-07
1987-06-23
Schwadron, Martin P.
Fluid handling
With casing, support, protector or static constructional...
Jacketed
251292, 251306, 251308, F16L 700
Patent
active
046745289
ABSTRACT:
A butterfly valve includes a body having pipe connecting parts forming two opposite ends thereof and a cylindrical flow path interconnecting the pipe connecting parts, a stem attached rotatably at the central part of the body diametrically across the cylindrical flow path, a lever handle connected non-rotatably to the external leading end of the stem, and a disc formed by joining two substantially circular metallic plates in a mutually opposed manner, coating the entire outer surfaces of the metallic plates with a corrosionproof, resilient material, and boring a stem-insertion hole between the two joined metallic plates in the central diametric position thereof and disposed inside the cylindrical flow path of the body for accommodating the stem non-rotatably within the stem-insertion hole thereof. An externally open groove having a substantially U-shaped cross section is formed in the joint periphery of the two joined metallic plates of the disc. The externally open groove is filled tightly to capacity with a corrosionproof, resilient material. The corrosionproof, resilient material which tightly fills up the externally open groove confers a substantially semicircular cross-sectional outline to the periphery of the disc to engage with the cylindrical flow path of the body.
REFERENCES:
patent: 2081307 (1937-05-01), Rosenberg
patent: 3306316 (1967-02-01), Stillwagon
patent: 3572632 (1971-03-01), Bengtsson
patent: 3902697 (1975-09-01), Robinson
patent: 3904173 (1975-09-01), Naylor
patent: 4492361 (1985-01-01), Jacquet et al.
patent: 4509720 (1985-04-01), Griffin et al.
patent: 4580593 (1986-04-01), Herberholz
Nishio Hideaki
Tomono Masahiko
Kitz Corporation
Novack Sheri M.
Schwadron Martin P.
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