A simple titanium valve for high‐pressure sapphire tubes is designed and tested for the application of NMR measurements.

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(a) Saphicon Inc., Milford, NH 03055.
(b) 70 Viton O-ring size 010, Sandem Industries, Butler, NJ 07405.
(c) 30% Glass filled Teflon, Grewe Plastics, Newark, NJ 07107.
(d) SB348 GR2, Titanium Industries, Fairfield, NJ 07006.
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5.
A similar valve utilizing no aligner has been designed for the 5-mm high-pressure sapphire tubes (see Ref. 4a).
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