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Wilden Diaphragms

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Wilden® Diaphragm Technology


Diaphragms are the heart of an air operated, double diaphragm pump. Wilden offers a wide range of elastomes and types of diaphragms to match the most difficult application. With the largest selection of AODD diaphragms in the world Wilden ensures that your unique application is fully met with the best possible diaphragm, ranging from aggressive fluids to petroleums/oils to seawater.
Wilden has dedicated a micro site to diaphragm technology, which you can raeach with the link below.
Link to Wilden Diaphragm Micro Site

Other resources include:
Chemical Compatibility Guide
Wilden Full Stroke PTFE Brochure
Wilden EZ Install Brochure
White Paper on Diaphragm Selection

Wilden also provides an on-line look up guide for a wide range of chemicals. Search Chemical Compatability


Wilden® Pump now has available its new Full Stroke PTFE (Teflon®) Diaphragms for use on all of standard-setting AODD pump lines. The video below shows the operation of the full stroke vs the original PTFE diaphragm (with the smaller outer piston.) You can see the old style diaphragm crease with each stroke
The original PTFE diaphragms creased as it flexed, creating stress lines in the diaphragm. The Full Stroke PTFE diaphragm allows the diaphragm to roll through evenly across the face of the diaphragm, resulting in longer diaphragm life.
The new design results in increased product displacement per stroke, translating into greater flow rates and higher efficiencies than are found in pumps that operate with reduced-stroke PTFE diaphragms.
Another benefit of the Full Stroke PTFE Diaphragms is that they use the same shaft and piston combinations as Wilden®’s standard rubber and TPE (thermoplastic elastomer) diaphragms, meaning they are retrofittable to existing rubber fitted pump without the need for any extra components. The new Full Stroke PTFE Diaphragms re available on 1, 1.5, 2, and 3 inch pumps.
Download PTFE Diaphragm Brochure


The new Wilden Chem-Fuse DiaphragmUltraFlex

The Wilden Chem-Fuse Diaphragm is the latest improvement in diaphragm technology offered by Wilden. The integral piston eliminates one of the wear points on the diaphragm, the interface between the outer piston and the diaphragm. Studies have shown any solids will work their way into the gap and wear on the diaphragm at the interface. By eliminating the outer piston, the wear point is removed.
In addition, the Chem-Fuse Diaphragm eliminates a potential leak point, between at the outer piston. This can be critical with hazardous chemicals.
The video below shows the Chem-Fuse diaphragm in action, and points out the wear point on the standard diaphragm which is being avoided. gm is available in Buna-N, Nordel®, Neoprene, Viton® materials.

Download The Chem-Fuse Flyer


EZ Install Wilflex DiaphragmsEZ Install

Wilden® Pump has upgraded the design of its cost-effective Wil-Flex Diaphragms to allow for easier installation. The Wil-Flex diaphragms are now available in a flat profile design, eliminating the need to invert the diaphragm when rebuilding a pump.
Made of Santoprene®, which is a thermoplastic elastomer that links EPDM (ethylene propylene diene Monomer) rubber and polypropylene, Wil-Flex diaphragms are an excellent low-cost alternative to PTFE diaphragms. Their design characteristics make them ideal applications with abrasives and with wide swings in pH levels. Because of their thermoplastic qualities, Wil-Flex diaphragms have inherent tensile strength and do not need fabric reinforcement.
Wil-Flex diaphragms are currently available for use on the Advanced Series Metal 25mm (1”) bolted stainless steel and aluminum, 38mm 1-1/2”) bolted stainless steel, and 76mm (3”) bolted stainless steel and aluminum models. Wilden®’s Advanced bolted pumps also include the Pro-Flo X air distribution system that allows the pump user to control the flow rate and maximize efficiency to reduce processing costs.
The video below shows the easy installation of the EZ Install diaphragms

Download EZ Install Brochure



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