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Air Operated Double Diaphragm Pumps

Change Is In the Air… FTI Air Operated Double Diaphragm pumps are the product of hard work by FTIs team of skilled associates. FTI Air products are designed by experts in the transfer of the most corrosive fluids operating in demanding environments. They have created a line of products that are high quality, rugged and extremely reliable. All backed by a five year warranty.

Simple, Rugged and Reliable Air Valve Design

  • Painted die cast aluminum or glass fiber reinforced polypropylene plastic valve body options for standard or corrosive atmospheres
  • Low friction carbon filled PTFE slide valve on the polished alumina ceramic valve plate allows for longest life and superior sealing eliminating air leakage. It also eliminates high cost seals moving over holes, as needed on many competitors’ valves.
  • Molded Buna gasket is fitted to grooves in the face of the valve body and slide valve plate to ensure total sealing and eliminate flat gasket tearing.
  • Uses air through slotted diaphragm shaft to shift the valve eliminating need for separate pilot valve or mechanically operated pilot valve. Fewer parts, simpler design and less prone to failure.
  • Non-stalling design – air valve cannot stall in any position
  • Outside mounting assures easy access for inspection or maintenance – valve can be removed and serviced while pump is still installed
  • Lube free design eliminates the need for packing grease or lubricated air
  • Fewer parts reduces maintenance time and costs
  • All components are individually replaceable to easily restore the valve to brand new condition
Air operated double diaphragm pumps are positive displacement pumps that use a combination of the reciprocating action of two flexible diaphragms, two inlet and two outlet ball check valves to pump a fluid. There are two pump chambers which are divided by the diaphragms into air and fluid regions. The two diaphragms are connected to a common shaft located in the center section. This creates the effect that during a cycle one side is pumping fluid while the other side is filling.

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