US 12,188,573 B2
Spool valve
Tadanobu Kawato, Tokyo (JP); Naoki Nishimura, Tokyo (JP); and Masaki Hoshi, Tokyo (JP)
Assigned to EAGLE INDUSTRY CO., LTD., (JP)
Appl. No. 18/034,663
Filed by EAGLE INDUSTRY CO., LTD., Tokyo (JP)
PCT Filed Oct. 25, 2021, PCT No. PCT/JP2021/039230
§ 371(c)(1), (2) Date Apr. 28, 2023,
PCT Pub. No. WO2022/097515, PCT Pub. Date May 12, 2022.
Claims priority of application No. 2020-185375 (JP), filed on Nov. 5, 2020.
Prior Publication US 2023/0392697 A1, Dec. 7, 2023
Int. Cl. F16K 11/07 (2006.01); F16K 31/06 (2006.01)
CPC F16K 31/0613 (2013.01) [F16K 11/07 (2013.01); F16K 11/0708 (2013.01); Y10T 137/8671 (2015.04)] 14 Claims
OG exemplary drawing
 
1. A spool valve, comprising: a sleeve having a plurality of ports; and a spool arranged inside the sleeve and including a land configured so as to be brought into sliding contact with an inner wall of the sleeve, wherein
a depression is formed over an entire circumference in at least one of the land and the inner wall of the sleeve with which the land is brought into sliding contact,
the depression is a plurality of grooves which are arranged to extend in at least two different directions and to partially intersect with each other, a plurality of dimples which are arranged to be isolated from each other, or a plurality of diagonal grooves which are arranged to be inclined with respect to a circumferential direction and to be isolated from each other.