Abstract: 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.

Abstract: A sight glass assembly comprising a housing adapted to be mounted on a wall, the housing having a bore therethrough, the housing bore having an enlarged section providing a shoulder, a lens disposed in the enlarged bore section and seated on the shoulder, at least one deformable O-ring mounted on the lens and disposed between a periphery of the lens and a wall of the enlarged bore section of the housing, a retainer member threadedly mounted on the housing, the retainer member having a bore therethrough disposed in alignment with the housing bore when the retainer member is threadedly munted on the housing, the retainer bore having an enlarged section providing a shoulder and the lens being disposed between the housing and the retainer shoulders, the retainer member having a member receivable within the enlarged housing bore section between the housing and the lens when the retainer member is threadedly mounted on the housing for compressing the O-ring against the housing shoulder and causing the O-ring to exp

Abstract: A sight glass assembly comprising a first housing section having an opening therethrough, mountable on a vessel wall having an opening therethrough so that the first housing section opening registers with the vessel wall opening, the opening of the first housing section having an enlarged section, a second housing section cooperable with the first housing section, having an opening therethrough registered with the opening in the first housing section, the opening in the second housing section having an enlarged section disposed in opposed relation to the enlarged section of the opening in the first housing section, a lens disposed across the openings having the periphery thereof disposed between the housing sections and received within the enlarged sections of the openings in the housing sections, a sealing ring assembly disposed in the enlarged sections of the housing section openings, included a rigid compression ring and a resilient packing member, the compression ring being engageable with one of the hous

Abstract: A sight glass assembly comprising a housing structure having a circular opening therethrough, the opening having an enlarged section, a lens disposed across the opening and having a peripheral portion received within the enlarged section of the housing structure opening, a sealed ring assembly disposed in the enlarged section of the housing structure opening, the sealing ring assembly comprising a rigid compression ring and a resilient packing member mounted on the compression ring, the packing member having an L-shaped cross-sectional configuration including a wall portion mounted on an inner side of the compression ring and engaging the periphery of the lens and a flange portion mounted on the compression ring and engaging the housing structure, and means mounted on the housing structure and engageable with the compression ring for urging the compression ring against the packing member, causing the packing member to expand radially, thereby effecting a seal between the housing structure and the periphery of