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Flanges are used to bolt PVC pipes to pumps and valves etc. Flanged disconnectable fittings provide capability for maintenance and future changes to the pipeline.
The 50, 80, 100 and 150 sizes are “stub” or short face flanges as opposed to the large full face flanges of other pipe sizes. These products include a PVC backing ring.
Vinidex recommends the use of a backing ring with all flanges of 50mm nominal size and over. (See Cat 16A.) Large washers should be used with bolts and nuts on smaller flanges. Do not overtighten.
