The full-stroke integral piston diaphragm (FSIPD) from Wilden? has received Patent No. 8,496,451 from the United States Patent and Trademark Office.
“This patent identifies Wilden as a global leader of AODD pumps in the hygienic industry,” says Robert Jack, development engineer, Wilden Pump and Engineering. “The FSIPD provides the clean-ability that customers need and adds the flow rate and suction-lift performance they want. In addition, customers will be happy to know that a Wilden FSIPD is about half the cost of a PTFE IPD.”

Wilden’s Full-Stroke Integral Piston Diaphragm (FSIPD) development team includes (l-r) Robert Jack, Dave McCall, Greg Duncan, Peter Tisnado, Wallace Wittkoff, and Nathan Hale.
Constructed of Wil-Flex? (Santoprene?), FSIPDs do not incorporate an outer metallic plate that requires the pump to be cleaned manually. Instead, the metallic plate is integrated into the material itself, resulting in a diaphragm design that uses the same shaft and inner piston as Wilden’s rubber and TPE diaphragms to maximise performance.
According to the company, FSIPDs are easy to install and do not require inverting of the diaphragm for installation. They do not use any adhesives that could get exposed to the pumping media. In addition, their material and construction make them a cost-effective alternative to PTFE IPDs.

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