There is/was a radial n-way valve called, I think, a ScaniValve, or some such, intended for multiplexing a single pressure transmitter or sampling system among a bunch of sampled streams. They are normally motor driven and cycle slowly. Gas chromatography and high pressure liquid chromatography use small plug valves made of PTFE, with aluminum shells and stainless hardware. They are normally hand operated with rather small handles. They are commonly available with a variety of plugs, including 4-way 6-way and 8-way radial selectors. 9-way would be a special, but should be achievable. One market leader is/was Hamilton. I have used them on an OEM basis, driven directly by size 23 steppers, and gotten decent life and tolerable pricing. Do not underestimate the cost of homebrewing this stuff; I have seen fortunes dissipated trying to make small valves on the cheap.

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