Not that long ago I would have been hard pressed for such a solution, thankfully things have changed. In recent years we have seen the introduction of single-use solutions for most, if not all, bioprocessing applications and sample valves are no exception. The folks at FluidLine Technology have introduced a line of disposable sampling valves that can be either Single-Use (3 cleaning cycles) or Limited Use (12 cleaning cycles). Here is a link to more information;

Fluidline Technology