| 摘要 |
A sight glass assembly generally including a first housing section having an opening therethrough, mountable on a container wall having an opening communicating with a fluid contained therein so that the housing section opening registers with the container wall opening, the first housing section opening having an enlarged section including a lens seating surface and a packing bearing surface inclined relative to a longitudinal center line of the first housing section opening, a second housing section having an opening therethrough registered with the first housing section opening, the second housing section opening having an enlarged section including a lens seating surface and a packing bearing surface inclined relative to the longitudinal center line, disposed in opposed relation to the lens seating and packing bearing surfaces of the enlarged section of the opening in the first housing section, a lens disposed in the housing openings, interposed between the seating surfaces, a packing member disposed in the enlarged opening sections, the packing member engaging the bearing surfaces of the housing sections and the periphery of the lens, and means for urging the packing bearing surfacings of the housing sections together whereby the packing is caused to expand laterally to place the lens in lateral compression and to provide a fluid tight seal between the housing sections and the periphery of the lens.
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