Butt-Weld Four-Way Spherical Cross Sight Glass with Union Window Closures

Welded Inline Ends and Slotted Union-Nut Viewing Ports

This four-way cross sight glass (model SGC-11-S) matches the No.50042 and No.50041 dimensional drawings directly: two opposed butt-weld spigots form the inline flow passage, while two perpendicular threaded bosses house replaceable tempered glass discs compressed by slotted round union nuts.

Exact Inch (No.50042) and DIN (No.50041) Dimensions

Drawing No.50042 (3A, SMS, ISO, DS) covers 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 3-1/2", and 4" with tube outer diameters D from 25.4 to 101.6 mm, bore diameters Dn from 22.4 to 97.6 mm, heights H from 67 to 168 mm, and lengths L from 90 to 300 mm. Drawing No.50041 (DIN) covers DN25 through DN100 with outer diameters D from 28 to 104 mm, bores Dn from 25 to 100 mm, heights H from 67 to 168 mm, and lengths L from 90 to 300 mm.

Material Grades and Seal Elastomers

Manufactured in CNC-machined SS304 or SS316L stainless steel, the sight glass supports silicone, EPDM, Viton, NBR, and PTFE window seals for food, wine, dairy, beverage, vacuum, pharmaceutical, and chemical service (source-claimed tempered glass rating up to 10 bar and -10 °C to +120 °C with EPDM).

Pre-Weld Disassembly and Ordering Notes

Unscrew both slotted union nuts and remove the tempered glass lenses and elastomer gaskets before welding the spigots into the pipeline. Specify at order placement if heat numbers or MTR certificates are required.