High-pressure control valve for high-performance liquid chromatography

A high-pressure switching valve for high-performance liquid chromatography, the high-pressure switching valve comprising:

• (a) a stator including a plurality of ports, wherein each port is connected at one end to a port connection and each port having at another end a predetermined port opening cross section at a stator end face of the stator,
• (b) a rotor including a rotor end face, in which the rotor end face presses against the stator end face and in which the rotor end face includes at least one or a plurality of grooves, the rotor configured to have a rotary position with respect to the stator where two predetermined port opening cross sections connect to one of the grooves in a pressure-tight manner,
• (c) wherein the rotor and the stator are pressed together in a sealing manner in a region of contact at the rotor end face and the stator end face,
• (d) the rotor and the stator each comprise a hard material, and
• (e) in that the rotor is configured to wobble or tilt with respect to a rotational axis of the rotor,
• in which the stator end face includes a planar region in the region of contact with the rotor end face, and the rotor end face includes a domed region in the region of contact with the stator end face, or
• the rotor end face includes a planar region in the region of contact with the stator end face, and the stator end face includes a domed region in the region of contact with the rotor end face, or
• the rotor end face includes a domed region in the region of contact with the stator end face and the stator end face includes a domed region in the region of contact with the rotor end face, in which a peripheral region of the region of contact has a reduced surface pressure when applying pressure between the rotor and the stator compared to another high-pressure switching valve that does not have at least one domed region of a stator end face or a rotor end face.