Hi fellas. Thanks for the advice. It's very helpful. I disassembled one of the valves and found out that it has an interesting configuration for a needle valve. There is the usual needle, the usual driving thread, packing, and a top thread on the packing nut. The last one is where it is corroded and binding. There should be no oxygen up here, and I would be a huge slob if I left one milligram of flake graphite up there. A microgram would probably suffice, and the hazard of that at 6 psi oxygen in the lower part of the valve is very small. I found out that Black Swan is not really silicone grease (it is silicone bearing) and is therefore not safe for oxygen service.
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