Spool-type switching valve

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11913553
APP PUB NO 20220146001A1
SERIAL NO

17429995

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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In a spool-type switching valve in which a recessed groove in which a packing is mounted is provided at a land portion of a spool, a groove bottom of the recessed groove is formed of an inclined surface that has an axial length half or larger than the length of the groove bottom in the direction of an axis and that continuously decreases in diameter from an upstream end to a downstream end, the inner periphery of the packing is brought into pressure-contact with the groove bottom with stress concentration at a pressure contact point that defines an upstream end of the inclined surface, and an angle θ that a connection surface connecting the pressure contact point on the groove bottom and the upstream end forms with the axis is within the range of 0°≤θ≤α, where α is an angle that the inclined surface forms with the axis.

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Patent Owner(s)

  • SMC CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Miyazoe, Shinji Moriya, JP 137 1468
Noguchi, Kazuhiro Tsukubamirai, JP 99 1102

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