Method for fixing stopper ring to pipe spigot
AssigneeKubota Corporation
InventorsManabu Kurotobi, Mutsuo Uchida
Life of this patent
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Abstract
A method for fixing a stopper ring to the outer periphery of the spigot of a cast iron pipe for preventing separation of the pipe from another pipe. A single or plural annular grooves are formed on the inner periphery of the stopper ring, and a brazing filler material is fitted in the annular groove. The stopper ring with the annular groove in which is fitted the brazing filler material is fitted on the spigot of the pipe. Subsequently, the pipe is ferritically annealed and the stopper ring is simultaneously brazed to the spigot by the heat of annealing.
Claims6
A method for fixing a stopper ring to the outer periphery of the spigot of a cast iron pipe which comprises:
- forming a single or plural annular grooves on the inner periphery of the stopper ring,
- fitting a brazing filler material in the annular groove or grooves,
- fitting on the spigot of the pipe the stopper ring with the annular groove or grooves in which is fitted the brazing filler material, and
- subsequently ferritically annealing the pipe and brazing the stopper ring to the spigot under the heat of annealing.
Dependencies are inferred from the claim text.