Wilden Products

Durability, Reliability and Cost Savings

Not only are Wilden pumps the most cost-effective, reliable and energy-efficient solutions available, but our state-of-the-art air distribution systems (ADS) significantly increase positive displacement pump productivity by reducing air consumption and maintenance for the most energy-efficient AODD pump operation possible.

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Chem-Fuse Savings Calculator

Personalized savings calculations for your operation

Instantly see your potential savings based on the pre-filled standard mean time between failure data for Chem-Fuse and Conventional Diaphragms.

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Wilden Markets

Wilden® solves pumping challenges across the spectrum

Wilden® positive displacement air-operated double-diaphragm (AODD) pump solutions are leading the way in a host of industries and applications.

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Wilden Support

The Wilden World of Service and Support - Assistance Beyond Expectations

Wilden® is always ready to assist with technical support for Wilden AODD pumps, parts or accessories.

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Chem-Fuse Savings Calculator

Personalized savings calculations for your operation

Instantly see your potential savings based on the pre-filled standard mean time between failure data for Chem-Fuse and Conventional Diaphragms.

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Principles of AODD Pump Operation

How AODD Pumps Work

Air-Operated Double-Diaphragm (AODD) pumps are classified as reciprocating, positive-displacement-style pumps. They operate by displacing fluid from one of its two liquid chambers upon each stroke completion. To operate, the AODD pumps require a given amount of pressure (measured in pounds per square inch) and air volume (measured in cubic feet per minute) to deliver the proper amount of fluid. 

The simple genius of the AODD pump design means that there are only a few wetted parts that are dynamic: the two diaphragms, which are connected by a common shaft, the two inlet valve balls and the two outlet valve balls. The diaphragms act as a separation membrane between the compressed air supply and the liquid. Driving the diaphragms with compressed air instead of the shaft balances the load on the diaphragm, which removes mechanical stress from the operation and extends diaphragm life. This also allows the valve balls to open and close on the valve seats, which direct liquid flow. This simple design and operation makes it easy for the operator to find the correct pressures and flows to optimize its operation.

More specifically, the pump begins operation when the air distribution system directs the air supply to the right air chamber and back side of the diaphragm. This moves the diaphragm away from the center block and toward the liquid chamber, in the process pulling the opposite diaphragm inward. This means the opposite diaphragm is now on its suction stroke. At the same time, atmospheric pressure forces fluid into the inlet manifold, forcing the inlet valve ball off its seat. This allows liquid to move past the inlet valve ball and into the liquid chamber.

When the pressurized right liquid chamber reaches its liquid capacity, the air valve redirects compressed air to the back side of the opposite diaphragm. This forces that diaphragm away from the center block while pulling the right diaphragm towardhow-aodd-pumps-work the center block. This closes the inlet valve ball on the opposite side while lifting the discharge valve ball off its seat and forcing the liquid to flow through the discharge manifold. The process is repeated for the opposite side, with the liquid chamber filling, the forced air redirecting the diaphragms and the created pressure forcing the discharge valve ball off its seat as the liquid moves through the discharge manifold.

As the pump reaches its original starting point, each diaphragm has gone through one suction and one discharge stroke, which constitutes one pumping cycle.

Applications

  • Chemical
  • Paint & Coatings
  • Mining
  • Oil & Gas
  • Water & Wastewater
  • Liquid Terminals
  • Process
  • Semiconductor
  • Food & Beverage
  • Pharmaceutical

How AODD Pumps Work - Video

Driven by compressed air, AODD pumps operate by using two diaphragms that shift the air supply from one liquid chamber to the other. As one diaphragm fills with air, it forces the fluid out of one chamber towards the discharge piping while simultaneously filling the second chamber with fluid. When the end of the diaphragm stroke is reached, it reverses automatically and the cycle is repeated in the opposite direction.