Looking closely at a membrane designed specifically for a diaphragm valve, it is immediately clear that its main task is protection and isolation: isolating different working media, protecting the process from external influences and protecting the environment from the process.
Well-known companies such as Burkert, GEMU and SED have refined membrane design over many years.
Membranes are made from:
- highly flexible ethylene propylene rubber (EPDM) — suitable for hygienic processes;
- fluororubber (FKM) — used in water treatment systems;
- polytetrafluoroethylene (PTFE) — ideal for hygienic processes involving chemicals;
- second-generation polytetrafluoroethylene (Advanced PTFE) — ideal for large temperature differences.
The right membrane material can only be chosen by analysing each specific application. The chemical properties and temperature of the working media cause different reactions, so material compatibility should be checked by an authorised specialist. Only then can long, safe and cost-effective use be guaranteed.
AT Engineering supplies membranes for diaphragm valves from Burkert, GEMU, SED and others.