Circular sight glass fitting type 321 DIN 28121 PN 10/25For flange mounting USAGE Round sight glass fittings are used for observing and illuminating the interior of closed containers (boilers, tanks, silos, etc.). Type 321 sight glass fittings are round flange mounts for screwing onto flanges, completed with a sight glass plate that is inserted and securely screwed between the gaskets. The sealing is done using a flexible gasket, with the force shunt ensuring the necessary compression. Suitable seals should be used for the sealing surfaces. The screw material should be equivalent to or of higher quality than the sight glass flanges. Generally, screws that are appropriate according to applicable standards should be used. If possible, the screw thread, as well as the screw head, should be provided with screw lubrication. Operating conditions for higher temperatures see type 323 10112025 - Subject to technical changes and errors!

r Circular sight glass fitting type 321 DIN 28121 PN 10/25

r Circular sight glass fitting type 321 DIN 28121 PN 10/25 Example for Explaining the Code Composition GROUP TYPE NOMINAL SIZE 1) Borosilicate glass according to DIN 7080 or similar 2) Soda-lime glass according to DIN 8902 or similar 4) Borosilicate glass2 + PTFE wiper SGW 5) Borosilicate glass2 + silicone wiper SGW 6) Soda-lime glass3 + PTFE wiper SGW 7) Soda-lime glass3 + silicone wiper SGW 1) Cover flange according to quote / order confirmation Unless otherwise specified, the highlighted factory standard will be delivered. The product code 11-321-1-100-1-1-1-0 corresponds to the standard version:...

r Circular sight glass fitting type 321 DIN 28121 PN 10/25 QUICK OVERVIEW custom designs possible accessories available OPERATING CONDITIONS Operating conditions depend on the choice of glass and gaskets: 10112025 - Subject to technical changes and errors!

r Circular sight glass fitting type 321 DIN 28121 PN 10/25 OPTIONAL ACCESSORIES Spraying device SV2 > For intermediate flange mounting FEP protective screen / coating > for high pH values The pressure-temperature limits according to DIN EN 1092-1 apply! 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