| 摘要 |
A sight glass assembly generally consisting of a first housing section having an opening therethrough mountable on a vessel wall, a second vessel section having an opening therethrough registrable with the first housing section opening when the first housing section is disposed in assembled relation with the second housing section, a pair of lenses disposed in the housing sections across the openings thereof, provided with beveled surfaces along the mating surfaces thereof, a packing member disposed between annular side walls of the lenses and the housing sections, and means for urging the housing sections together to compress the packing material and cause it to expand laterally to place the lenses in radial compression to maintain their structural integrity upon being fractured. The inner wall of the packing engaging the annular side walls of the lenses is provided with an annular recess registrable with the mating surfaces of the lenses which permits material of the packing to flow therein during compression thereof and thus avoid such material from being forced between the beveled edges of the lenses to force the lenses apart by a wedging action.
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