Single injection valve for HPLC combining sample introduction, wash cycles and diagnosis

摘要

A switchable valve for a sample injector includes a first valve member and a second valve member that can moved with respect to the other. The first valve member includes a plurality of ports, the second valve member includes a plurality of fluid paths. The plurality of ports include eight circumferential ports distributed along a circumference and one central port arranged at a central position of the first valve member. The plurality of fluid paths include three arcuate fluid paths so as to be couplable with at least two of the circumferential ports and one straight fluid path extending between the central position and a circumferential position so as to be couplable with the central port and one of the circumferential ports.

主权项

1. A sample injector configured to introduce a sample fluid into a mobile phase, wherein the mobile phase is to be driven by a mobile phase drive through a separation unit for separating compounds of the sample fluid in the mobile phase, the sample injector comprising:
a sample loop for receiving the sample fluid, a switchable valve for switching the sample loop between the mobile phase drive and the separation unit, wherein the switchable valve comprises; a first valve member and a second valve member, wherein at least one of the first and second valve members is configured to be moved with respect to the other; the first valve member comprises a plurality of ports; the second valve member comprises a plurality of fluid paths for fluidly coupling respective ones of the ports in dependency on a relative movement position of the first and second valve members with respect to each other; wherein the plurality of ports comprise eight circumferential ports distributed along a circumference of the first valve member and comprise one central port arranged at a central position of the first valve member; wherein one of the circumferential ports has an extension groove; wherein the plurality of fluid paths comprise three arcuate fluid paths each being arcuate so as to be couplable with at least two of the circumferential ports; wherein the plurality of fluid paths comprise one straight fluid path extending between the central position and a circumferential position so as to be couplable with the central port and with one of the circumferential ports.