Patent ID: 9329157
Filing Date: 2016-05-03
CPC Classification: F16K,G01N

Claim Text:
1. A switching valve for liquid chromatography comprising: (a) a stator including a plurality of ports and a stator face surface, each port having a predetermined port opening cross section at the stator face surface; (b) a rotor including a rotor face surface, the rotor face surface pressed against the stator face surface, the rotor face surface having at least one or more grooves, in which the switching valve has a predetermined switching position where one of the grooves connects the predetermined port opening cross sections in a pressure-tight manner, the rotor and the stator both being at an axially front region of the switching valve; (c) a drive device configured to rotate the rotor; and (d) a device for detecting a rotational position of the rotor and generating a signal corresponding to an absolute or a relative rotational position of the rotor, the device being situated in an axially rear region of the switching valve, in which the device for detecting a rotational position of the rotor comprises a transmission element, the transmission element being coupled rotationally conjointly to the rotor, and the transmission element being movable in a substantially load-free manner.