ARO® air-operated double-diaphragm pumps handle clean to corrosive, abrasive fluids of medium viscosity and coarse-grained solids.
Three series—PRO, EXP, and FDA—cover flow rates up to 1,041 l/min, in a wide range of materials from polypropylene to Hastelloy, with ATEX certification and FDA approval.
PRO Series
Double-Diaphragm Pumps for Industrial and OEM Applications
EXP Series
Double-diaphragm pumps for process engineering, lowest total cost
FDA Series
Double-diaphragm pumps for hygienic applications (SD and PM pumps)
Diaphragm Pumps
For conveying semi-solids up to a maximum diameter of 2" (51 mm) and solids up to 3/4" (19 mm)
High-Pressure Pumps
For fluid pressures above 6.9 bar
Accessories
Replacement Parts and Accessories for ARO® Pumps
Advantages
Maximum throughput
Up to 1,041 l/min with minimal pulsation and low air consumption—patented ARO® technology.
Easy Maintenance
Modular design, few components, easy-to-use repair kits—minimal downtime and costs.
FDA-approved
SD Series with Quick Disassembly (QKD), PM Series in 316 stainless steel—for the food, pharmaceutical, and cosmetics industries.
Self-priming
Operates solely on compressed air, seal-less, safe for short-term dry running—suitable for mobile use.
High reliability
Lubrication-free, patented differential valve on the main air valve and the SimulShift (pilot valve), as well as "Fluid On Demand."
Benefits in Detail
The ARO® PRO Series air-operated diaphragm pumps are ideal for general industrial and OEM installation applications. These double-diaphragm pumps deliver high flow rates of up to 897 l/min for clean, low-viscosity fluids as well as corrosive, abrasive fluids of medium viscosity, and can handle large particles without damage.
- Seal-less design
- High reliability due to minimal material wear
- Quick maintenance and repair thanks to easy access to ball check valves and fluid covers
- Versatile connection options to suit specific application needs
- Can be run dry without sustaining damage
- Mobile use
- Self-priming
- Easy installation
- Available for use in hazardous areas (ATEX, NEC, and CEC certifications)
The EXP Series diaphragm pumps stand out for having the lowest total cost of ownership of any diaphragm pump on the market. These double-diaphragm pumps offer the perfect solution in terms of energy efficiency and downtime. In addition, ARO offers a wide range of materials and flow rates of up to 1,079 l/min, providing the perfect solution for every application.
- The ability to integrate with almost any automation system (ARO controller, PLC, or PC-based system) via an electronic interface allows you to transition from imprecise, manual processes to efficient and intelligent fluid management.
- Optional leak sensors detect diaphragm failure and minimize costly downtime
- Patented SimulShift™ design with symmetrical air valves ensures reliable startup and prevents the startup difficulties associated with other pumps
- Quick Dump™ check valves for venting cold exhaust air from components prone to icing prevent icing and failures
- Reduced downtime thanks to a service life four times longer than that of other manufacturers on the market
- Simple and quick repairs thanks to cost-effective service kits
- Available for use in hazardous areas (ATEX, NEC, and CEC certifications)
The SD Series diaphragm pumps are designed for the efficient and safe transfer of food, beverages, pharmaceutical, and cosmetic products. With factory-installed options, you can customize your ARO® hygienic pump to meet your specific application requirements, ensuring cost-effective and hassle-free integration under factory supervision. The QKD (Quick Disassembly) design enables rapid inspection and maintenance—and thus a quick return to service.
- Expert Series pump design for improved flow rates and greater reliability
- The compression-clamp band design enables quick cleaning, service, and maintenance
- Optimized flow rate through improved design for better overall performance and low material shear. This also enables a 20–30% higher flow rate than the competition
- FDA compliance thanks to construction from electropolished 316 stainless steel
The PM Series of diaphragm pumps is ideal for applications requiring quick-disconnect fluid connections. They are constructed from FDA-approved materials and feature an electropolished 316 stainless steel wetted section, as well as a bolted assembly with fittings made entirely of stainless steel.
Applications
Typical applications and areas of use for ARO® double-diaphragm pumps.
Industry
Versatile handling of clean to mildly abrasive media – PRO Series for OEM and installation applications.
Process Engineering
High flow rate of up to 1,041 l/min with minimal total cost of ownership—the EXP Series offers a wide range of material configurations.
Food and Pharmaceuticals
FDA-approved materials, QKD quick-disassembly – SD and PM series for hygiene applications.
Chemicals and Petrochemical industry
Corrosive and aggressive media – Hastelloy, stainless steel, and PVDF for maximum resistance.
Areas Protected Against Explosions
Flammable media – ATEX-certified (CE Ex II 2GD X), no electrical connection.
High-pressure and special-purpose pumps
Pressures above 6.9 bar, powder transfer, semi-solids up to 51 mm – specialty pumps for specific requirements.
A Comparison of Compressed Air Diaphragm Pumps
PRO Series
Double-diaphragm pumps for industrial and OEM applications: The PRO Series double-diaphragm pumps offer first-class performance and operational reliability thanks to their unbalanced start valve. In addition, these diaphragm pumps from ARO® achieve flow rates of up to 897 l/min. The pumps are ideally suited for general industrial and OEM installation applications.
EXP Series
Double-diaphragm pumps for process engineering, lowest total cost of ownership: These pumps are the double-diaphragm pumps with the lowest total cost of ownership on the diaphragm pump market and are the favorite among process professionals. The EXP series double-diaphragm pumps also stand out thanks to a wide range of material configurations and high flow rates of up to 1,041 l/min.
FDA Series
SD Series diaphragm pumps are designed for the efficient and safe transfer of food, beverage, pharmaceutical, and cosmetic products. The QKD design for quick disassembly enables rapid inspection and maintenance, followed by quick return to service. PM Series diaphragm pumps are ideal for applications that require quickly disconnectable fluid connections. The pumps are also constructed from materials (316 stainless steel) that are FDA-approved.
Technical Specifications
An overview of the key specifications and features of the most popular series—to help you choose and compare.
Feature |
PRO Series |
EXP Series |
FDA Series (SD/PM) |
| Max. flow rate | 897 l/min | 1,041 l/min | 729.4 l/min |
| Maximum outlet pressure (bar) |
8.3 bar | 8.3 bar | 8.3 bar |
| Connection sizes | 1/4" – 3" | 1/4" – 3" | 15 bar |
| Materials | PP, Acetal, PVDF, AL, GG, S, Hastelloy | PP, acetal, PVDF, AL, GG, S, Hastelloy | Stainless steel 316 (PM), various (SD) |
| ATEX |
✓ (CE Ex II 2GD X) | ✓ (CE Ex II 2GD X) | – |
| FDA | – | – | ✓ |
| Quick disassembly |
– | – | ✓ (QKD, SD Series) |
| Folded membranes |
✓ | ✓ | ✓ |
| Ideal for | High versatility for standard industrial applications | Maximum efficiency with reduced downtime and operating costs | FDA-compliant pumping with quick cleaning and maintenance |
| PRO Series | EXP Series | FDA Series |
* Detailed specifications for each series and size can be found in the ARO® General Catalog. All specifications are subject to pump model, operating pressure, and fluid.
Technical Specifications by Series
Materials
| Non-metallic materials | Polypropylene, Acetal, and PVDF |
|---|---|
| Metallic Materials | Aluminum, cast iron, stainless steel, and Hastelloy |
Overview of PRO Series Plastic Double-Diaphragm Pumps
| Nominal Diameter | 1/2" | 1" | 1 1/2" | 2" |
|---|---|---|---|---|
| Maximum flow rate (l/min) | 54.5 | 178 | 378.5 | 548.8 |
| Maximum outlet pressure (bar) | 6.9 | 8.3 | 8.3 | 8.3 |
| Material connection | 1/2" NPT, BSP |
1" NPT, BSP, ANSI/DIN flange |
1 1/2" ANSI / DIN flange |
2" ANSI / DIN flange |
| Air connection | 1/4" NPT | 1/4" NPT | 1/2" NPT | 1/2" NPT |
| Materials | Polypropylene , PVDF, biodegradable acetal |
Polypropylene | Polypropylene | Polypropylene |
| Maximum solid content (mm) | 2.4 | 3.2 | 6.4 | 6.4 |
| ATEX | Yes, with conductive acetal |
- | - | - |
*Other models with various nominal diameters (1/4", 3/8", 3/4") available upon request
Overview of PRO Series Metallic Double-Diaphragm Pumps
| Nominal Diameter | 3/4" | 1" | 1 1/2" | 2" | 3" |
|---|---|---|---|---|---|
| Maximum flow rate (l/min) | 51.5 | 133 | 340.7 | 651 | 897 |
| Maximum outlet pressure (bar) | 6.9 | 8.3 | 8.3 | 8.3 | 8.3 |
| Material connection | 3/4" NPT, BSP |
1" NPT, BSP |
1 1/2" NPT, BSP |
2" NPT, BSP |
3" NPT, BSP |
| Air connection | 1/4" NPT | 1/4" NPT | 1/2" NPT | 3/4" NPT | 3/4" NPT |
| Materials | Aluminum | Aluminum , Cast Iron, Stainless Steel |
Aluminum , cast iron, stainless steel |
Aluminum , cast iron, stainless steel |
Aluminum , cast iron, stainless steel |
| Maximum solid content (mm) | 2.4 | 3.2 | 6.4 | 6.4 | 9.5 |
| ATEX | All models | All models | All models | All models | All models |
The EXP Series diaphragm pumps are available in the following materials
| Non-metallic materials | Polypropylene, acetal, and PVDF |
|---|---|
| Metallic materials | Aluminum, cast iron, stainless steel, and Hastelloy |
Overview of EXP Series Plastic Double-Diaphragm Pumps
| Nominal Diameter | 1/4" | 3/8" | 1/2" | 3/4" | 1" | 1 1/2" | 2" | 3" |
|---|---|---|---|---|---|---|---|---|
| Maximum flow rate (l/min) | 20 | 40.1 | 54.5 | 56 | 200 | 465 | 696 | 1079 |
| Maximum outlet pressure (bar) | 8.6 | 6.8 | 6.8 | 6.8 | 8.3 | 8.3 | 8.3 | 8.3 |
| Material connection | 1/4" NPT, BSP |
3/8" NPT, BSP |
1/2" NPT, BSP |
3/4" NPT, BSP |
1" NPT, BSP, ANSI/DIN flange |
1 1/2" ANSI / DIN flange |
2" ANSI / DIN flange |
3" ANSI / DIN flange |
| Air connection | 1/4" NPT | 1/4" NPT | 1/4" NPT | 1/4" NPT | 1/4" NPT | 1/2" NPT | 3/4" NPT | 3/4" NPT |
| Materials | Polypropylene , PVDF, Grounding-compatible acetal |
Polypropylene , PVDF, biodegradable acetal |
Polypropylene , PVDF, earthable acetal |
Polypropylene | Polypropylene , PVDF, conductive polypropylene |
Polypropylene , PVDF, conductive polypropylene |
Polypropylene-PVDF Conductive polypropylene |
Polypropylene-PVDF |
| Maximum solid content (mm) | 1.6 | 1.6 | 2.4 | 2.4 | 3.2 | 6.4 | 6.4 | 9.5 |
| ATEX | Yes, with conductive acetal |
Yes, with conductive acetal |
Yes, with conductive acetal |
- | Yes, with conductive PP / PVDF |
Yes, with conductive PP |
Yes, with conductive PP / PVDF |
- |
Overview of EXP Series Metallic Double-Diaphragm Pumps
| Nominal Diameter | 1/2" | 3/4" | 1" | 1 1/2" | 2" | 3" |
|---|---|---|---|---|---|---|
| Maximum flow rate (l/min) | 45.4 | 51.5 | 197 | 465 | 651 | 1,041 |
| Maximum outlet pressure (bar) | 6.9 | 6.9 | 8.3 | 8.3 | 8.3 | 8.3 |
| Material connection | 1/2" NPT, BSP |
3/4" NPT, BSP |
1" NPT, BSP, ANSI/DIN flange |
1 1/2" NPT, BSP, ANSI / DIN flange |
2" NPT, BSP, ANSI/DIN flange |
3" NPT, BSP, ANSI / DIN flange |
| Air connection | 1/4" NPT | 1/4" NPT | 1/4" NPT | 1/2" NPT | 3/4" NPT | 3/4" NPT |
| Materials | Aluminum , Stainless Steel |
Aluminum | Aluminum , Cast Iron, Stainless Steel, Hastelloy C |
Aluminum , Cast Iron, Stainless Steel, Hastelloy C |
Aluminum , cast iron, stainless steel, Hastelloy C |
Aluminum , Cast Iron, Stainless Steel, Hastelloy C |
| Maximum solid content (mm) | 2.4 | 2.4 | 3.2 | 6.4 | 6.4 | 9.5 |
| ATEX | All models | All models | All models (with metal motor) | All models (with metal motor) | All models (with metal motor) | All models (with metal motor) |
| Product Series | Non-metallic materials | Metallic Materials |
|---|---|---|
| PRO Series | Polypropylene, Acetal, PVDF | Aluminum, Cast Iron, Stainless Steel, Hastelloy |
| EXP Series | Polypropylene, Acetal, PVDF | Aluminum, cast iron, stainless steel, Hastelloy |
| SD Series | - | Electropolished 316 stainless steel |
| PM Series | - | Electropolished 316 stainless steel |
| High-pressure pumps | - | Stainless steel |
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