| 摘要 |
<p>The invention relates to a switching valve for liquid chromatography; the switching valve comprises: a stator provided with a plurality of ports, each port is formed by a passage, one end of the passage is respectively connected with a connecting port, and a preset port opening cross section is arranged on the other end of the passage on a stator end face of the stator; a rotor provided with a rotor end face mutually working with the stator end face, at least one or more grooves are formed in the rotor end face, and the groove is respectively connected with the preset port opening cross section in a sealing manner in at least one preset operation position according to a rotation position of the rotor relative to the stator; a drive device driving the rotor to rotate; a device used for measuring the rotation position of the rotor, and the device generates a signal corresponding to an absolute position or a relative position of the rotor. The measuring device is provided with a transmission part capable of rotatably moving; the transmission part can coaxially connect a front portion with the rotor or with a connecting piece bacically anti-rotatably connected with the rotor in an anti-rotation mode.</p> |
