switching valves for liquid chromatography, especially high-pressure switching valve for high-speed liquid chromatography

摘要

PROBLEM TO BE SOLVED: To provide a small-sized switchover valve for liquid chromatography improved in temperature resistance, especially a high-pressure switchover valve appropriate for high-speed liquid chromatography.;SOLUTION: A stator 29 having a plurality of ports is located in this switchover valve, each port connecting with one conductor. Each conductor communicates with one port terminal 31, and the other end of the conductor has a prescribed port opening profile on an end surface of the stator. A groove on an end surface of a rotator 23 having a common end surface which works together with the stator end surface causes a prescribed plurality of port terminals communicate with each other at prescribed switchover positions relative to the stator according to a rotational position of the rotator. In addition, a driving unit 45 of the rotator and a device 55 for detecting the rotational position of the rotator and sending a signal are provided. The device has a rotating transmission member 51, the transmission member being connected to a same axis of the rotator at its forward end, or to a connection member 15 connected to the same axis with the rotator by rotational fixation. The device for detecting the rotational position of the rotator detects a rotational position of a rear end of the transmission member 51.;COPYRIGHT: (C)2014,JPO&INPIT