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The Flux diaphragm pump range is designed to provide efficient, reliable fluid transfer in a wide range of industrial and sanitary applications. Whether handling viscous products, solids in suspension, abrasive fluids, highly flammable, or aerated liquids, these air-operated, self-priming pumps meet most demands with high operational safety and reliability. Their robust design ensures consistent performance, therefore making them a preferred choice in demanding environments.
Air-operated diaphragm pumps are positive displacement designs. They move a fixed volume of fluid with each pump stroke, with flow being proportional to stroke speed. Flow rate is variable via air pressure adjustment, subsequently providing precise control over dispensing operations. Additionally, optional stroke counters and flowmeters allow easy calculation of flow rates, making monitoring and efficiency adjustments simple. Integrated silencers help minimise noise output. Furthermore, ATEX-certified and food-grade versions are available, ensuring safety and compliance with industry regulations.
RFM diaphragm pumps are built for continuous operation in heavy-duty applications. To handle such tough duties, they are constructed from machined blocks of solid polypropylene or PTFE, with precision-matched diaphragms. The pump is bolted together using reinforced steel rods. Therefore, these pumps offer superior vibration resistance, durability and extended diaphragm life.
Furthermore, they ensure smooth, low-shear liquid transfer and are completely overload-proof. With the ability to handle rigorous duty cycles, they are ideal for industries such as chemical processing, pharmaceuticals and manufacturing. Their modular, bolted construction also allows for quick dismantling, therefore making cleaning and servicing hassle-free. And with easily accessible, fully-serviceable air shuttle valves, these pumps make maintenance fast and efficient.
FDM diaphragm pumps are manufactured in a range of materials, including polypropylene, aluminium, cast iron, stainless steel and also conductive acetal. They offer compatibility with most common chemicals and fluids, including flammable media*. Moulded plastic or cast metal housings keeps costs down, however, these pumps are best suited to intermittent duty cycles.
With high-pressure capabilities up to 8 bar, these pumps suit applications requiring high discharge pressure. They feature innovative stall-free air valves that enhance reliability and performance. A wide range of spare parts is available, including service kits containing all items needed to service your pump.
*Ex-certified versions only.
Please call us on 01202 823304 or email sales@flux-pumps.co.uk for assistance
A diaphragm pump is a type of positive displacement pump that moves liquid from one vessel, container, tank or process, to another. Most diaphragm pumps have two flexible diaphragms, connected together by an oscillating shaft. The shaft moves back and forth, creating negative or positive pressure in the two pumping chambers. This motion opens and closes the inlet and outlet check valves, allowing one chamber to fill while the other empties. Double-diaphragm pumps are powered by an electric motor or compressed air supply.
The pumping mechanism delivers precise fluid transfer without direct contact between the pumps’ working parts and the liquid being pumped. Moreover, these pumps are highly effective for handling corrosive, abrasive, viscous, or shear-sensitive fluids. They are widely used in almost every industry: chemicals, pharmaceuticals, petrochemicals, food processing, manufacturing and water or wastewater treatment. Furthermore, they can handle liquids with entrained solid particles, making them extremely versatile.
* dependent on pump model, media rheology
A diaphragm pump is a positive displacement pump that transfers a fixed volume of fluid with each stroke. Discharge flow rate is directly proportional to stroke speed.
A diaphragm pump operates using a reciprocating flexible diaphragm (or more commonly two diaphragms in parallel, aka. a double-diaphragm pump) moved back and forth by a piston (sometimes several pistons) or a connecting rod. These types of pumps can be operated by hand, driven by compressed air, or powered by an electric motor.
Fluid is either sucked into the pump chamber, or displaced, depending on stroke position. These pumps provide high suction lift and are capable of running dry for short periods without damage. They are particularly effective for pumping medium to high-viscosity liquids, slurries and abrasive materials.
In contrast, a centrifugal pump utilises a rotating impeller, with blades or vanes, to generate liquid flow. The impeller sits centrally inside a fixed casing. “Multi-stage” pumps may have two or more impellers, designed to increase delivery pressure. The impeller is commonly mounted on a driveshaft, which passes through the casing and is typically driven by an electric motor. However, alternative drives are also available e.g. gas turbine.
The impeller spins at high speeds (8-10,000 RPM) creating centrifugal force and driving liquid to the pump outlet. Most centrifugal pumps cannot create suction, therefore, they rely on atmospheric pressure to push fluid to the pump inlet. For this reason, they suit pumping low viscosity fluids and transferring large volumes quickly and efficiently.
Centrifugal pumps are available in many styles, for instance, with or without mechanical seals and even magnetically driven, instead of shaft driven. Centrifugal pumps are found in thousands of applications, most often pumping water or chemicals.
Yes, diaphragm pumps can run dry without damage, but only for short periods. Their dry running capability makes them well-suited to applications where liquid supply may be intermittent or inconsistent. Unlike other pump types that can suffer from overheating or mechanical seal failure when running dry, diaphragm pumps maintain their integrity, ensuring reliable operation even in unpredictable conditions. However, note that diaphragm pumps should only be run dry for short periods, otherwise diaphragms can deform and will potentially fail prematurely.
The air consumption of a diaphragm pump depends on several factors, including the pump size, flow rate and operating pressure. On average, diaphragm pumps consume between 0.3 to 1.5 cubic meters per minute (m³/min) of compressed air. By adjusting the air pressure, operators can optimise efficiency and performance, reducing overall energy consumption while maintaining the desired flow rate.
Pump performance curves will show flow vs. discharge pressure vs. air consumption, at different air inlet pressures. This information is useful when deciding on compressor size, or when checking available air capacity in an existing compressed air system. Always size the air inlet hose correctly for a particular pump; otherwise, restricted airflow will reduce performance.
For expert advice or to find the right pump for your needs, contact us today.
Air operated diaphragm pump range:
