How to Attain High Accuracy Using Air-Operated Double-Diaphragm (AODD) Pumps

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ALMATEC Maschinenbau GmbH

Safe and Reliable

Every housing part on an E-Series pump is tightened to each other via housing bolts. However, instead of single bolts that press punctually against the housing, all of the bolts are tightened against a diaphragm-sized ring on each side of the pump. This results in a more even spreading of the housing-bolt force and an increase in permissible bolt torque, which enhances safety and reliability. An optimized flow pattern reduces the pump’s flow resistance, which results in increased efficiency and lower air consumption.

Additional Information

The Perswing P Air-Control System

The purpose of the pneumatic diaphragm pump air-control system is to ensure automatic operation that is indirectly controlled by the movement of the diaphragms. Reaching its final point, the stroke reverses automatically and the cycle of medium being drawn in by one diaphragm and being displaced by the other is repeated by the opposite side of the pump.

The metal-free, pneumatically pilot-operated Perswing P air-control system ensures accurate reversal of the main piston and is characterized by low noise levels. Only two moving parts ensure that there is absolutely no dead center. It does not require maintenance, operates without any lubrication whatsoever and is made up of no more than four different parts. The complete cartridge can be replaced easily. Perswing P is a precision control system and therefore requires clean, oil-free compressed air to ensure its optimal function.

Other significant features of the E-Series pumps include the patented maintenance- and lubrication-free Perswing P air-control system, which ensures accurate reversal of the main piston; optimized flow path for increased energy efficiency; Internal Piston Diaphragm (IPD) technology; integral dampeners for constant flow with no need for additional piping; variable port configurations; no drives, rotating parts or shaft seals; easy startup; and metal-free exterior.

Optional features include a barrier-chamber system for leak prevention; screw-on or flanged pulsation dampener; back-flushing system; stroke counter; diaphragm-monitoring system; and transport cart.

Almatec offers its E-Series pumps in seven sizes, from 6 mm to 76 mm (1/4" to 3"), with flow rates ranging from 15 to 800 L/min (4 to 210 gpm), which fit the range of flow rates that the enzyme-dosing application required.

“We’ve used Almatec pumps before and we’ve had good experience with them,” said Brinkman. “They’re very reliable and that’s most important for us because the devices we deliver to our customers produce 24/7 so they can’t afford to stop for mechanical issues. In the case of the pumps, Almatec is the best choice for us to include in our dosing systems and with the pulse dampener the flow is reduced to about 2 % of its pulse, which is more than enough for this application. We are completely satisfied with the flow we get through the flowmeters and the accuracy of the system.”

Conclusion

While the debate regarding the eating habits of goats may rage for years to come, there is no debate when it comes to acknowledging the high level of performance by Almatec E-Series AODD Pumps in enzyme-dosing applications during the production of animal feed. “If you look at the system, it’s quite critical that you have good components, A Class components, and Almatec pumps are A Class components, so that’s why we chose Almatec,” said Klaassen. “Technology Unlimited is also an A Class company, so together we were able to build the best solution for the customer.”

* The author is the Almatec Product Manager with Almatec Maschinenbau GmbH, Kamp-Lintfort/Germany.

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