Gas-tight ball valve
AssigneeSaphirwerk Industrieprodukte AG
InventorKarl Stark
Life of this patent
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Abstract
A gas-tight ball valve having a ball and a valve seat made of hard material such as sapphire or ruby, wherein said valve seat has two annular surfaces forming between them an edge with an obtuse angle, the ball resting on one of said surfaces, and a method for producing the valve seat by lapping said surfaces and then polishing them for breaking the edge between such surfaces.
Claims6
A gas-tight ball valve having a ball loosely resting on a valve seat made each of hard material, said valve seat being formed on a seat body having a bore and a face extending substantially radially outwardly from said bore, said valve seat being formed at the boundary between said bore and said face and having a broken edge between an inner spheric annular surface adjacent said bore and an outer spheric annular surface adjacent said face, each of said spheric annular surfaces having a radial width, the diameter of said valve bore, the radius of the ball, the radial width of said inner annular surface and the radial width of said outer annular surface being in a proportion of substantially 120:75:3:5.
Dependencies are inferred from the claim text.