Flow path switching valve, flow path switching valve system and liquid chromatograph

摘要

PROBLEM TO BE SOLVED: To provide a flow path switching valve having a long life by dispersing a worn region on a sliding surface of a stator and a rotor over the entire sliding surface. A flow path switching valve 5 includes a stator and a rotor. The stator includes fixed stator flow paths 31-36, and the rotor includes rotor flow paths 241-243. The flow path switching valve 5 has a first connection pattern in which the rotor flow path 241 connects the fixed stator flow path 31 and the fixed stator flow path 32, and the rotor flow path 241 connects the fixed stator flow path 31 and the fixed stator flow path 36. The second connection pattern and the rotor flow path 242 connect the fixed stator flow path 31 and the fixed stator flow path 32, and the third connection pattern and the rotor flow path 242 connect the fixed stator flow path 31 and the fixed stator flow path 32. One of a plurality of connection patterns including a fourth connection pattern for connecting 36 is realized according to the rotational state of the rotor. [Selection diagram] Fig. 5