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High Purity Pumps

Yamada® AD Series Pulsation Dampeners greatly reduce pressure fluctuations in fluid flow when mounted as close to the pump as possible. Yamada® AD dampeners incorporate a completely automatic self-relieving air motor if an increase or decrease in discharge head occurs.

Yamada® AD Series Pulsation Dampeners incorporate a flow-through design for fluids with high solids content which keeps solids in suspension, maintaining dampener effectiveness. They do not restrict fluid flow, or increase fluid pressure, but rather compensate for the voids and pressure fluctuations created by an air-powered double diaphragm (AODD) pump.

Yamada<sup>®</sup> AD-10 Series

AD - 10

Yamada<sup>®</sup> AD-25 Series

AD - 25

Yamada<sup>®</sup> AD-40 Series

AD - 40

Yamada<sup>®</sup> AD-50 Series

AD - 50

How does a double diaphragm pump work?

Compressed air is supplied to the upper chamber of the pulsation dampener at the same pressure as the air-operated double diaphragm pump. When the pump generates a pressure pulse, fluid enters the in-line dampener, compressing the trapped air. This temporarily stores the fluid until system pressure normalizes or the pump enters a new cycle, at which point the expanding air forces the fluid back into the pipeline. The dampener does not impede flow or increase pressure; instead, it compensates for voids and fluctuations caused by the pump, ensuring a more stable flow.

Metering / Injection / Dosing:  smoothing out discharge flow, increasing accuracy

Filter Press / Inline Filters:  Increase filter efficiency by providing smooth flow.

Spraying:  Smooth and consistent spray pattern is easilty accomplished.

Filing:  Eliminates inconsistent filling and splashing.

Transfer:  Eliminates harmful water hammer, which damages piping and valves.

Mount the pulsation dampener as close to the pump as possible. This will allow the pulsation dampener to see as much operation pressure as possible, which will increase pulsation dampener efficiency and effectiveness.

If the pulsation dampener is to be used in a low head application, you may need to add a control valve after the pulsation dampener to restrict flow and increase resistance.

Mount the pulsation dampener in a horizontal position. Vertical positioning is acceptable if you are pumping a clear fluid.

Features:

  • Flow through desing keeps solids in suspension
  • Totally automatic air motor-self relieves if discharge head reduces
  • Low air consumption
  • Bolted construction
  • PFTE coated air side optional

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What is a Double Diaphragm Pump How it works in an industrial application?

Air-operated double diaphragm (AODD) pumps utilize a 1:1 positive displacement mechanism powered by compressed air to accurately transfer a known volume of liquid from one point to another. This versatile pump technology is well-suited for a wide range of industrial and commercial applications due to the broad selection of available materials and reliable operating performance.

Ideal for handling high solids content, viscous fluids, extreme pH ranges, and dry running scenarios, AODD pumps also accommodate variable flow rates and suction lift requirements. Their inherently safe, explosion-proof design makes them an excellent choice in hazardous environments or where portability is essential.

With flow capacities ranging from 0.5 to 250 GPM and operation dependent solely on compressed air, air-operated diaphragm pumps offer a dependable and efficient solution for transferring nearly any liquid with minimal maintenance and maximum adaptability.

How does an air-operated double diaphragm pump work?

An air-operated double diaphragm pump is a pneumatic pump that uses a patented air valve. That air valve directs compressed air to either side of the pump, back and forth. As it does, it can run on regular compressed air, clean dry air, nitrogen, or even natural gas. While this switch is happening, the valve pushes compressed air behind a diaphragm. In turn, this directly applies the force to the liquid in the chamber and forces it up and out of the pump. The force that pushes one diaphragm out also pulls the other diaphragm in, as they are attached to a common center shaft. This action creates a vacuum in the opposite liquid chamber. Then, when one side is evacuating the liquid, the other side is filling up. The two sides alternating creates a flow rate, ensuring the transfer of liquids.

While one side of the pump is evacuating liquid, the other side is filling up. This process goes back and forth to create the actual liquid transfer and the subsequent flow rate required. There are four ball check valves inside a standard pump which allow the liquid to travel from the bottom suction manifold to the top discharge manifold. With this technology, you can run anywhere from a few psi or air pressure all the way up to 125 psi of pressure, depending on the flow rate and the discharge pressure required.

While the Yamada NDP pump series is widely recognized as the industry standard for air-operated double diaphragm (AODD) pumps, its versatility extends far beyond conventional applications. These pumps are also well-suited for handling more specialized and demanding media such as ultra-high purity chemicals, pharmaceuticals, alcoholic beverages, food-grade products, and fluids with higher viscosities or solid contents—up to 40% by weight. With minimal modifications, most NDP pump models can be customized to meet the specific requirements of these unique processes. Additionally, pneumatic operation makes these pumps ideal for transferring highly flammable or explosive liquids, as they are easily grounded and inherently safer due to their non-electrical, air-driven operation.