Circular sight glass fitting type 321A Class 150 lbsfor ANSI/ASME flange mounting similar to DIN 28121 USAGE Round sight glass fittings serve to observe and illuminate the interior of closed containers (boilers, tanks, silos, etc.). Sight glasses of type 321A are round sight glass fittings that are compatible with ANSI flanges Class 150 lbs, completed with a sight glass plate inserted between the seals and tightly screwed. The sealing is done through a flexible seal, where the force shunt ensures the necessary compression. Seals suitable for the sealing surfaces should be used. The screw material should be equivalent to or of higher quality than the sight glass flanges. In principle, screws that meet the applicable standards should be used. Whenever possible, the screw thread as well as the screw head should be lubricated with screw lubrication. Similar to DIN 28121 but for Flange connection according to ANSI / ASME 10112025 - Subject to technical changes and errors!

Example for Explaining the Code Composition 1) Class only related to the bolt circle. Max pressure 20 barg! For higher working pressures see high-pressure variant type 322A EXAMPLE STRUCTURE The product code 11-321A-1-4-1-1-1-0 • corresponds to the standard design: # Base flange made of 1.4571 Cover flange made of 1.4571 • PTFE coated encased corrugated ring gasket Unless otherwise specified, the highlighted factory standard will be delivered. Cover flange Glass cushion Sight glass PTFE coated encased corrugated ring gasket Base flange Screws For aggressive media, FEP or Halar® coated sight glass...

Circular sight glass fitting type 321A Class 150 lbs for ANSI/ASME flange mounting similar to DIN 28121 fl 0 heat-resistant up to 200 for liquid media Custom made designs Accessories available OPERATING CONDITIONS Operating conditions depend on the choice of glass and gaskets: 10112025 - Subject to technical changes and errors!

Circular sight glass fitting type 321A Class 150 lbsfor ANSI/ASME flange mounting similar to DIN 28121 Type OPTIONAL ACCESSORIES Spraying device SV2 > For intermediate flange mounting FEP protective screen / coating > for high pH values 9 Konigskamp 19 • 52428 Julich • Germany 10112025 - Subject to technical changes and errors! > up to 320 °C with Borosilicate glass DIN 7080 > with PTFE, silicone, EPDM or FKM wipers