Method for making seat assembly for butterfly valves
AssigneeCrane Co.
InventorMichael Sherlaw
Life of this patent
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Abstract
A method of making an improved seat assembly for a butterfly valve. The seat assembly comprises a flexible, circular metal band embedded in a resilient material to form an annular seat assembly. The assembly is made by supporting the band in a fixed spatial position on movable finger members, positioning a mold about, but spaced from, the band, and molding the annular seat assembly in the mold to embed the band. The invention is also directed toward an improved seat assembly. In a preferred embodiment the circular band is made of two curved sections overlapping at the two joints and having diametrically opposite holes in the two overlapping areas.
Claims7
A method of making a resilient valve seat assembly having a flexible ring therein for a butterfly valve comprising, providing two substantially C-shaped circular band segments each having circumferential ends with the ends of each segment having holes therein forming a flexible circular band by overlapping the ends of the two part circular band segments with the holes in alignment and joining the overlapped ends together, therein supporting the circular band in a fixed spatial position, positioning a mold about but spaced from the band while the band is supported, and molding an annular seat member from resilient material while the mold is positioned about the band to substantially embed the band within the seat member.
Dependencies are inferred from the claim text.