Patent ID: 8236175

Claim:
A liquid chromatograph system including: a liquid chromatograph; a liquid-feeding pump for sucking a mobile-phase solution and ejecting the mobile-phase solution into a channel so as to supply the mobile-phase solution through the channel into the liquid chromatograph; and a channel-switching valve for switching a state of the channel between an injection state in which the channel is configured so that the mobile-phase solution with a sample flows into the liquid chromatograph and a sample-loading state in which the channel is configured so that the mobile-phase solution without any sample flows into the liquid chromatograph, wherein: the channel-switching valve includes a stator and a rotor which has a surface in contact with one surface of the stator and rotates while sliding on the contact surface; the stator has a plurality of liquid flow ports open to the contact surface; the rotor has a plurality of channel grooves for connecting the liquid flow ports, one of the channel grooves being a straight channel groove passing through a rotational center of the rotor, and the other channel grooves being line-symmetrically arranged with respect to the aforementioned straight channel groove; in the sample-loading state, the straight channel groove communicates with the liquid-feeding pump; and in the injection state, at least two, line-symmetrically arranged channel grooves communicate with the liquid-feeding pump.