US 12,247,959 B2
Flow passage switching valve, flow passage switching valve system, and liquid chromatograph
Ayano Otsubo, Tokyo (JP); Nobuhiro Tsukada, Tokyo (JP); Hisao Inami, Tokyo (JP); Shoji Tomida, Tokyo (JP); Mitsuhiko Ueda, Tokyo (JP); Daisuke Akieda, Tokyo (JP); and Kenichiro Nishiki, Tokyo (JP)
Assigned to HITACHI HIGH-TECH CORPORATION, Tokyo (JP)
Appl. No. 17/764,613
Filed by HITACHI HIGH-TECH CORPORATION, Tokyo (JP)
PCT Filed Sep. 10, 2020, PCT No. PCT/JP2020/034266
§ 371(c)(1), (2) Date Mar. 29, 2022,
PCT Pub. No. WO2021/075184, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 2019-190312 (JP), filed on Oct. 17, 2019.
Prior Publication US 2022/0326197 A1, Oct. 13, 2022
Int. Cl. G01N 30/38 (2006.01); F16K 11/074 (2006.01); F16K 37/00 (2006.01); G01N 30/20 (2006.01); G01N 30/26 (2006.01)
CPC G01N 30/38 (2013.01) [F16K 11/074 (2013.01); F16K 11/0743 (2013.01); F16K 37/0041 (2013.01); F16K 37/005 (2013.01); G01N 30/20 (2013.01); G01N 30/26 (2013.01); G01N 2030/385 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A flow passage switching valve for a liquid chromatograph system comprising:
a stator;
a rotor configured to be rotatable with respect to the stator; and
a control device that controls a rotation of the rotor,
wherein the flow passage switching valve is characterized in that the stator includes a first stator flow passage, a second stator flow passage, and a third stator flow passage, wherein distances from an axis of a stator main body to the first, second and third stator flow passages are equal to another,
wherein the rotor includes a plurality of rotor flow passages that are each circumferentially disposed, including a first rotor flow passage and a second rotor flow passage, wherein distances from an axis of a rotor seal of the rotor to the first and the second rotor flow passage are equal to one another,
wherein the flow passage switching valve is configured to achieve any of a plurality of coupling patterns corresponding to a rotation state of the rotor,
the plurality of coupling patterns including:
a first coupling pattern where the first rotor flow passage couples the first stator flow passage and the second stator flow passage;
a second coupling pattern where the first rotor flow passage couples the first stator flow passage and the third stator flow passage;
a third coupling pattern where the second rotor flow passage couples the first stator flow passage and the second stator flow passage; and
a fourth coupling pattern where the second rotor flow passage couples the first stator flow passage and the third stator flow passage,
wherein the control device is configured to operate in any of:
a first mode that reciprocates between the first coupling pattern and the second coupling pattern; and
a second mode that reciprocates between the third coupling pattern and the fourth coupling pattern.