It is difficult to compare different diaphragms and their life cycles, because, as of now, there are no real test standards.  So which one do you go with?

 

At All-Flo, we really only offer thermoplastic manufactured elastomers.  This process allows you to hold very tight tolerances, minimizes any voids, and it allows you to keep a better diaphragm profile.  In addition, our Santoprene and Geolast elastomers each have a high shore hardness.  Those diaphragms are stiff, which helps them maintain their design profile and gives them a longer cycle life.  Geolast and Santoprene also do very well on abrasive services.

A PTFE diaphragm is excellent because it is inert to almost every liquid, but it has several disadvantages:  it’s more expensive, has cold temperature limitations (good to only 40 degrees), and only does “fair” on abrasive services.

When deciding on a diaphragm, it makes a difference how much PSI you are pumping:  your cycle life at 20PSI will be very different than your cycle life at 120PSI.

Other factors that affect your diaphragm cycle life are:  Liquid media used, Liquid discharge pressure, and Suction conditions.

For more information, check out our Technical Resources page (http://all-flo.com/technical-resources.html) to learn more about diaphragm options and materials used and to view performance curves.

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