US 11,940,048 B2
Valve device
Toshiaki Ishii, Kanagawa (JP); Makoto Koyama, Kanagawa (JP); and Daisuke Takayama, Kanagawa (JP)
Assigned to MIKUNI CORPORATION, Tokyo (JP)
Filed by MIKUNI CORPORATION, Tokyo (JP)
Filed on Mar. 10, 2021, as Appl. No. 17/197,067.
Claims priority of application No. 2020-104154 (JP), filed on Jun. 17, 2020.
Prior Publication US 2021/0396315 A1, Dec. 23, 2021
Int. Cl. F16J 15/10 (2006.01); F16J 15/30 (2006.01); F16J 15/54 (2006.01)
CPC F16J 15/10 (2013.01) [F16J 15/30 (2013.01); F16J 15/54 (2013.01); F04B 2201/0603 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A valve device, comprising:
a body that defines a passage through which a fluid flows;
a shaft that is movably supported with respect to the body and defines an axis;
a valve element that is fixed to the shaft to open and close the passage; and
a cylindrical bearing bush that movably supports the shaft with respect to the body,
wherein the cylindrical bearing bush includes a mixed region in which a metal core material and expanded graphite are mixed with each other, and a first expanded graphite region in which only the expanded graphite exists such that the metal core material is not exposed in an inner circumferential side region in contact with an outer circumferential surface of the shaft,
in the first expanded graphite region, a layer thickness dimension in a diameter direction perpendicular to the axis from an inner circumferential surface of the cylindrical bearing bush is in a range of 0.05 mm to 0.2 mm.