2. The whole flange window and ring sealing groove are formed in one step in the large gantry machining center.

3. The flatness of the sealing support surface and the bottom surface of the sealing groove is <0.1 mm/m. 

4. The flange window and the box adopts continuous welding mode, with non-destructive testing adopted to detect the weld, and there is no leakage in the welding. It adopts the vacuum sealing mode of embedding the integrated "O-shape" sealing ring into the ring-shape groove without seams on the sealing ring, for high sealing reliability, low leakage rate, and box leakage rate of <0.0006vol%/h.

5. Suitable for sealing of windows and doors of vacuum equipment.

           2. Sealing Method: The hollow O-ring is placed between the glass and supporting surface.

           3. Hollow O-Ring: By the compression deformation of the hollow O-ring, the unevenness of the support surface gets compensated. The hollow diameter

           is around 2~4mm, some poor-quality O-ring is up to 10mm. And there are wrinkles after the O-ring is pressed which leads to a high leakage rate and

           unreliable sealing.

           4. A kind of simple mechanical sealing, not a vacuum sealing.

           5. Applicable for sealing of large thin-walled parts whose sealing surface cannot bemachined, or for simple sealing of non- vacuum equipment without

           quality requirements.