Air-Operated Double-Diaphragm Plus Pumps
Featuring One-Nut® Technology
Our hygienic range of diaphragm pumps offers a versatile and robust answer to your liquid transfer needs, with One-Nut® technology that takes AODD+ pump performance far beyond the traditional. This fast maintenance concept literally turns the conventional pump inside-out.
Flotronic® Good Food Pump- Food Grade AODD Pump
Double Diaphragm Pump ideal for pumping your food products, especially on high viscosity low shear applications. Designed for ‘quick strip’ which is tool free or the pumps can be ‘cleaned in place’ (CIP), manufactured throughout from FDA compliant approved materials. The 'Good Food' pump gives food industry customers very specific benefits.
A compact and self-draining Diaphragm Pump available in FDA approved 316L stainless steel, aluminium, Duplex 22, and Hastelloy®; used in an array of industries.
Flotronic® 710 Series Stainless Steel Pump
Fabricated 316L stainless steel or Hastelloy® on all wetted metal parts offers unrivaled versatility. These FDA compliant Air-Operated Double-Diaphragm Pumps are used extensively throughout the industry.
Flotronic® Sanitary AODD+ Pump
Designed with 3A in mind using FDA, USP Class VI and (EC) 1935/2004 approved materials; our range of Sanitary Diaphragm Pumps help maintain and improve hygienic conditions on your site.
Flotronic® One-Nut Double Diaphragm Pump Accessories
A wide range of additional accessories and customization options to ensure your Flotronic® One-Nut pump meets your application requirements.
Hygenitec™ Large Solids AODD Pump
Designed specifically for hygienic applications requiring the transfer of solids up to 3.8” (96.5mm). Applications include the transfer of fruit and vegetables suspended in water, pie fillings, wine processing and ice cream production.
Hygenitec™ Poultry Processing AODD Pump
The Poultry Processing pump was designed to transfer chicken tenders, disjointed wings, giblets and waste products. The pump features a unique Flap Check design which protects the integrity of the product. Available in vertical or horizontal configurations.
Hygenitec™ Food Grade AODD Pump
FDA compliant pumps are engineered for food and cosmetic applications and are constructed with the FDA approved materials for food contact. These pumps are stainless steel and feature Tri-Clamp® fittings for quick knockdown and cleaning.
Constructed with polished stainless steel 316, these pumps are designed for sanitary process applications where a hygienic design is critical. The pumps are mounted on a swivel stand and can be cleaned in place.
3A certifed pumps feature over-molded diaphragms, a swivel stand and can be cleaned in place (CIP). These pumps are constructed with polished stainless steel and feature an oil-free air valve.
Traditional AODD vs Flotronic AODD+
You may have tried an AODD before. But that’s nothing like a Flotronic AODD+
Frequently Asked Questions
An AODD (Air-Operated Double-Diaphragm) pump is a positive displacement pump that uses compressed air to move two flexible diaphragms in alternating patterns, creating suction and discharge to transfer fluid. The design creates a balanced condition with air pressure acting on the entire diaphragm surface, making these pumps suitable for various viscosities and shear-sensitive fluids. Unibloc Hygienic Technologies offers innovative Flotronic® AODD+ pump, with its unique One-Nut® design, greatly accelerates cleaning and maintenance times compared to a traditional AODD pump.
Yes, AODD pumps can run dry indefinitely without damage to the pump or its components. This capability makes them extremely versatile for applications where running dry is a concern, such as tanker unloading, product transfer between tanks, or processes with intermittent fluid flow. Rotary pumps may be damaged by running dry because fluid is not present to dissipate the heat generated by the friction of a rotating component. In contrast, AODD pumps continue operating without harm, and contributes to their popularity in various industries. Like traditional AODD pumps, the Unibloc® Flotronic® AODD+ pump can run dry when necessary. Unlike traditional pumps, it also offers easier maintenance and an accelerated cleaning cycle because of its unique One-Nut® design.
Air-operated double diaphragm (AODD) pumps utilize compressed air to create reciprocating motion in two diaphragm chambers. As one chamber fills with fluid, the other discharges, creating a continuous flow. The reciprocating action is driven by an air distribution system that alternately pressurizes and exhausts each air chamber, while check valves ensure directional flow control. This simple yet effective design enables reliable fluid transfer without electrical components.
AODD pumps use positive displacement through reciprocating diaphragms, while centrifugal pumps rely on rotational energy to generate flow. AODD pumps excel at handling viscous fluids and can run dry without damage, maintaining consistent flow rates regardless of discharge pressure. Centrifugal pumps offer higher flow rates but are pressure-dependent and require priming. AODD pumps also provide superior solid-handling capabilities and gentler product handling. Centrifugal pumps, should not be used with shear sensitive liquids and when the integrity of solids must be preserved.
AODD pumps typically achieve discharge pressures up to 125 PSI (8.6 bar), though specific models can reach higher pressures. The maximum pressure is directly related to the input air pressure, usually with a 1:1 ratio. However, for sanitary applications in food processing, most operations run at lower pressures to ensure gentle product handling and maintain diaphragm longevity.
AODD pumps achieve mechanical efficiency rates of 65-80% depending on operating conditions. Sanitary diaphragm pumps comply with FDA, 3A, and EHEDG standards, featuring materials like 316L stainless steel and food-grade elastomers. These standards regulate surface finish (typically 32 Ra or better), material compatibility, cleanability, and CIP/SIP capabilities. Modern designs emphasize energy efficiency while maintaining strict sanitary compliance.
Hygienic diaphragm (AODD) pumps are sanitary when designed to meet specific standards. FDA, 3A, and EHEDG standards establish strict requirements for material compatibility, surface finish (typically 32 Ra or better), cleanability, crevice-free design, and CIP/SIP capabilities. The 3A standard in the United States and the EHEDG standard in Europe require the pump body to have specific characteristics intended to reduce points where bacteria could hide and to enhance cleanability. The pump manufacturer must submit drawings to the authority to receive sanitary certification. Some pump manufacturers offer pumps that meet the requirements without a certificate as a way to lower pump cost. Compliance with the FDA standards basically means that wetted parts are made of stainless steel and food-grade elastomers; FDA compliance is typical of any hygienic pump. The FDA does not certify pump designs, but 3A and EHEDG do.
