Gauge Glass Fitting

[Thomas ClarkeParticipant @thomasclarke78224]

I am replacing  the broken gauge glass on my 5 in gauge locomotive. The glass that was was on the locomotive was 5.5mm in diameter. I am replacing it with an improved 6mm one but it is a tighter fit. How much of a gap should I allow in the union nut and the top and bottom valves and should there be a gap at the ends of the gauge glass when it is seated between the valves. Thanks.

[noel shelleyParticipant @noelshelley55608]

Nothing should be tight. I would open up all diameters .5mm or 20 thou. The end clearance, the important thing is that the glass and fittings can move, so not to far through the O rings or seals but enough to ensure a good seal hot. Good luck.  Noel.

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