Double-Diaphragm Pumps - Reliable Pumping for Abrasive, Chemical, and Solid-Containing Fluids
Double-diaphragm pumps are the top choice when conventional pump technologies reach their limits. Our systems reliably handle aggressive, solids-laden, and gas-containing fluids—they are self-priming and can operate without liquid.
At Harton Anlagentechnik GmbH, we manufacture double-diaphragm pumps that are precisely tailored to your process parameters—from material selection to full integration into your system.
At Harton Anlagentechnik GmbH, we manufacture double-diaphragm pumps that are precisely tailored to your process parameters—from material selection to full integration into your system.
Why Choose Double-Diaphragm Pumps from Harton Anlagentechnik GmbH?
Double-diaphragm pumps operate on the principle of oscillating displacement. Two diaphragms are moved alternately by a central air or drive system, thereby generating a defined flow rate—regardless of pressure fluctuations in the system.
In our design process, each pump is individually engineered based on the fluid, solids content, viscosity, and chemical exposure. This results in robust solutions for applications where other pumps reach their limits.
- Self-priming up to approx. 6 m
- Tolerant of dry running without immediate damage
- Capable of pumping even with gas content or foaming media
- High process stability under varying operating conditions
Technical Specifications and Performance Ranges
Our double-diaphragm pumps are precisely designed for the operating point. The following ranges are provided for technical reference:
| Flow Rate (Q) | 1 - 1,000 l/min |
| Differential Pressure (Δp) | 1-8 bar; up to 16 bar depending on the project |
| Suction height | up to 6 m |
| Viscosity | 0.5-90,000 mPa·s |
| Solid content | up to 60% by weight |
| Particle size | up to 30 mm |
| Temperature range | -10 °C to +120 °C |
Operating Characteristics:
- Pulsating flow (optionally dampened)
- Flow rate dependent on stroke frequency
- Pressure-dependent flow control (especially for AODD)
Material Selection and Chemical Resistance
The choice of materials is based strictly on the medium, temperature, and chemical exposure.
Pump housing:
Diaphragm materials:
Valve systems:
Technical evaluation criteria:
Pump housing:
- Stainless steel (e.g., 1.4404 / 1.4571)
- Aluminum or ductile iron
- Plastic (PP, PVDF)
Diaphragm materials:
- PTFE (high chemical resistance)
- EPDM (aqueous media, steam)
- NBR (oil-containing media)
- FKM (solvents, oils)
Valve systems:
- Ball valves (high solids tolerance)
- Butterfly or slide valves
- Wear-optimized seat systems (e.g., ceramic)
Technical evaluation criteria:
- Abrasiveness and particle hardness
- Permeation and diffusion
- Elastomer compatibility
- Sedimentation and risk of clogging
Double-diaphragm pumps are specifically used in applications where the fluids are complex, abrasive, or chemically aggressive.
Typical applications:
Typical applications:
Typical applications:
- Chemical industry: acids, alkalis, solvents
- Wastewater and environmental technology: slurries, suspensions, mixtures of solids
- Food and pharmaceutical industries: shear-sensitive or viscous fluids
- Plant engineering: IBC emptying, drum pump applications
- Filter presses & process systems: continuous or batch conveyance
Typical applications:
- Conveying abrasive suspensions (e.g., sand, catalysts)
- Handling of gas-laden media
- Transfer of emulsions and oil-containing liquids
- Dosing and recirculation processes
Integration, Installation, and Operational Safety
Flawless integration is crucial for service life and process stability.
Suction-side design:
Peripherals and system integration:
Safety Concepts:
Suction-side design:
- Large pipe cross-sections
- Minimal pipe lengths
- Prevention of cavitation and degassing
Peripherals and system integration:
- Pulsation dampers for sensitive systems
- Filters and check valves
- Pressure and Flow Measurement
- Grounding for Explosive Media
Safety Concepts:
- Double-diaphragm systems with leak monitoring
- ATEX-compliant designs
- Defined venting and blow-off routes
Monitoring, Maintenance, and Service Life
Cost-effective operation is largely determined by maintenance and monitoring.
Monitoring parameters:
Wear indicators:
Maintenance strategy:
Monitoring parameters:
- Compressed air consumption and pressure level
- Stroke frequency
- Delivery pressure
- Leakage and diaphragm condition
Wear indicators:
- Decreasing flow rate
- Irregular stroke movements
- Increased noise
Maintenance strategy:
- Replacement of diaphragms and valves
- Inspection of seals and air valves
- Documented maintenance intervals
Pneumatic Double-Diaphragm Pumps (AODD):
Electric double-diaphragm pumps (EODD):
Economic evaluation:
- Operated by compressed air (typically 2-7 bar)
- Flow rate adjustable via air volume and pressure
- Resistant to load cycling
Electric double-diaphragm pumps (EODD):
- Higher energy efficiency
- Precise control of the flow rate
- Alternative when compressed air infrastructure is lacking
Economic evaluation:
- Compressed air consumption as a key TCO factor
- Energy comparison: AODD vs. EODD
- Impact of air quality on service life
Types and Variants of Our Double-Diaphragm Pumps
Our double-diaphragm pumps are available in numerous configurations and can be optimally adapted to different media, process requirements, and applications. Whether you’re dealing with chemically aggressive or high-viscosity liquids, hygienic applications, ATEX zones, or systems with integrated leak detection—we offer the right solution for virtually any dosing task. Explore the different models and find the dosing pump that best meets your needs.
For aggressive media such as acids, alkalis, and solvents, these pumps offer high resistance to corrosion and chemicals. They ensure safe operation in the chemical industry, the petrochemical industry, and other applications involving hazardous substances.
| Accuracy | ±1 - 2 % |
| Viscosity | 1 - 500.000 mPa·s |
| Temperature | -20 to +150 °C |
| Rotational speed | 500-3,000 1/min |
| Solids | up to 5% |
| Materials | Stainless steel, Hastelloy, PTFE |
| ATEX | optional |
| Dosing capacity | 0,1 - 1.000 l/h |
| Pressure | up to 8 bar |
These pumps are specifically designed for use in potentially explosive atmospheres and comply with all relevant ATEX requirements. They provide reliable pumping of hazardous fluids in environments where there is a risk of explosion.
| Materials | Stainless steel, Hastelloy, PTFE |
| ATEX | Zone 1, 2 |
| Dosing capacity | 0,1 - 1.000 l/h |
| Pressure | up to 8 bar |
| Accuracy | ±1 - 2 % |
| Viscosity | 1 - 500.000 mPa·s |
| Temperature | -20 to +150 °C |
| Rotational speed | 500 - 3.000 1/min |
| Solids | up to 5% |
Specially designed for pumping high-viscosity fluids such as lubricants, resins, and food-grade liquids. They provide consistent flow even with highly viscous liquids. These pumps are in particularly high demand in the food, chemical, and pharmaceutical industries.
| Dosing capacity | 0,1 - 100 l/h |
| Pressure | up to 6 bar |
| Accuracy | ±1 - 3 % |
| Viscosity | 500 - 1.000.000 mPa·s |
| Temperature | -10 to +150 °C |
| Rotational speed | 500 - 2.000 1/min |
| Solids | up to 1% |
| Materials | Stainless steel, PTFE, PVDF |
| ATEX | optional |
These pumps are specifically designed to meet the requirements of the food, pharmaceutical, and cosmetics industries. They meet the highest hygiene standards and are easy to clean to ensure compliance with the industry’s strict requirements.
| Rotational speed | 500-3,000 1/min |
| Solids | up to 1% |
| Materials | Stainless steel, PTFE, FKM |
| ATEX | optional |
| Dosing capacity | 0,1 - 500 l/h |
| Pressure | up to 20 bar |
| Accuracy | ±0.5-2% |
| Viscosity | 1 - 100.000 mPa·s |
| Temperature | -10 to +100 °C |
These pumps are designed for pumping oil-containing fluids such as lubricants, hydraulic fluids, and fuels. They ensure precise and reliable pumping, even at high pressures.
| Temperature | -10 to +150 °C |
| Rotational speed | 500-2,500 1/min |
| Solids | up to 1% |
| Materials | Stainless steel, aluminum, PTFE |
| ATEX | optional |
| Dosing capacity | 0,1 - 500 l/h |
| Pressure | up to 6 bar |
| Accuracy | ±0,5 - 1 % |
| Viscosity | 1 - 300.000 mPa·s |
These pumps feature built-in leak monitoring, which provides additional safety functions for detecting leaks and triggering alarms. This feature is particularly important in applications that require precise monitoring and a high level of operational safety.
| Dosing capacity | 0,1 - 1.000 l/h |
| Pressure | up to 8 bar |
| Accuracy | ±1 - 2 % |
| Viscosity | 1 - 500.000 mPa·s |
| Temperature | -20 to +150 °C |
| Rotational speed | 500-3,000 1/min |
| Solids | up to 5% |
| Materials | Stainless steel, Hastelloy, PTFE |
| ATEX | optional |
These pumps allow you to adjust the flow rate to suit the specific application and pressure requirements. They are ideal for applications where the flow rate must vary depending on production requirements. This flexibility maximizes efficiency and extends the pump's service life.
| Dosing capacity | 0,1 - 1.000 l/h |
| Pressure | up to 8 bar |
| Accuracy | ±1 - 2 % |
| Viscosity | 1 - 500.000 mPa·s |
| Temperature | -20 to +150 °C |
| Rotational speed | 500-3,000 1/min |
| Solids | up to 5% |
| Materials | Stainless steel, Hastelloy, PTFE |
| ATEX | optional |
These pumps are suitable for general-purpose use and provide reliable delivery of medium-viscosity liquids. They are used in the chemical, food, and pharmaceutical industries. Standard double-diaphragm pumps are characterized by their high flexibility and are indispensable in many different applications.
| Dosing capacity | 0,1 - 1.000 l/h |
| Pressure | up to 8 bar |
| Accuracy | ±1 - 2 % |
| Viscosity | 1 - 300.000 mPa·s |
| Temperature | -20 to +150 °C |
| Rotational speed | 500-3,000 1/min |
| Solids | up to 5% |
| Materials | Stainless steel, PTFE, PVDF |
| ATEX | optional |
Relevance for Engineers and Technical Buyers
A double-diaphragm pump is designed based on flow rate, differential pressure, fluid properties, viscosity, solids content, temperature, and the chemical resistance of all materials in contact with the fluid, in order to ensure safe and economical operation over the long term.
For technical procurement, key selection criteria include, in particular, flow rate, maximum operating pressure, materials used for the housing, diaphragms, and valves, drive type (AODD or EODD), connection sizes, ATEX compliance, and maintenance and spare parts strategies.
Depending on the application, double-diaphragm pumps are designed and documented in accordance with applicable requirements—such as ATEX for potentially explosive atmospheres, the Pressure Equipment Directive (PED), food and pharmaceutical regulations—as well as project-specific leak, material, and functional tests.
FAQs by Industry
Select an industry
Chemical Industry - Process Safety in the Extraction of Chemical Raw Materials
Food Industry - Use in Food and Beverage Filling
Water and Wastewater Technology - Industrial Wastewater Filtration
Mining Industry - Conveying Abrasive Materials
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