In this video, Max explains the different seal materials for valves. And how to pick the correct one for your system. Visit our website for more information ► [ Ссылка ]

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Hi, I'm Max and today we're going to talk about the different seal materials for valves!

Common seal materials for valves are NBR, FKM(Viton), EPDM, and PTFE (Teflon). Selecting the proper material for your valve depends on the media and application. Ensuring it is resistant to the media’s chemical properties and that it can handle the temperature and pressure of the application. Selecting the right seal material will ensure a long life and good performance of your valve.

First NBR, which stands for: Nitrile Rubber. It has a good mechanical properties and is resistant to water, oil, solvents and alcohol but has only a limited temperature resistance. The maximum working temperature is 80°C.

Next on our list is FKM, also called Viton: This is a Fluro-Elastomer. FKM has a very good chemical resistance and in contrast to NBR it is suitable for a temperature range of-10 and 120 °C. Please note that there is an exception for water: FKM is not suitable for water above 80°C. The mechanical properties are similar to those of NBR.

Then EPDM, which stands for Ethylene Propylene Diene Monomer. EPDM is a synthetic rubber that can be used for both cold and hot water and even steam. It is also suitable for alcohos and acidic/bases in low concentrations. A disadvantage of EPDM is the poor resistance to oil, fat and solvents. This makes it less suitable for use with pneumatic systems that use lubricated compressed air. EPDM has a very large working temperature range from -10 to 130 °C.

Finally, we have PTFE, which stands for Polytetrafluorethylene, but commonly called Teflon. Teflon is not very flexible, but in terms of chemical resistance, no other material can compete with it. The highest temperature range of all sealing materials, from -30 to 180°C. Teflon is a very hard material so you only see it with direct controlled valves or indirectly controlled valves with a piston.

Hopefully, this guide has helped you choose your ideal sealing material, if you have any further questions, please take a look at the chemical resistance table on our website or contact me or anyone else from Tameson!
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