Importance

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Abstract

A ball check valve that prevents vibration of the ball that occurs when fluids are conducted, so as to limit noise, without reducing the flow rate of the fluid includes a cylindrical valve main body having two opening parts and provided on an inner face with axially oriented elongate protrusions; a holding ring, which is held on the upstream opening part of the valve main body, abutting end faces of the elongate protrusions; a seat ring, which is disposed adjacent to or fitted with the holding ring; and a globular valve element, which is held so as to be able to reciprocate between stop faces on the elongate protrusions and a valve-closed position. When the globular valve element is abutting the stop faces of the elongate protrusions, the relationship between: the area S₁ of a flow path opening formed between an outer circumferential line that is orthogonal to the axis at the center of gravity of the globular valve element and the inner circumferential face of the valve main body; and the area S₂ of a flow path opening that is formed between the holding ring and the globular valve element at a line that connects the center of gravity of the globular valve element and the downstream inner circumferential line of the seat ring or the holding ring is S₂=0.45 S₁ to 0.65 S₁.

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First Claim