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Diaphragm pumps are widely used in a variety of sectors and can handle a wide variety of fluids. These pumps are classified as positive displacement pumps since their flow rates do not vary significantly with the pump's expulsion. These pumps are used to transport fluids with high, low, or medium viscosities, as well as fluids containing a large amount of particles. A PD (positive displacement) pump is a diaphragm pump. A membrane pump is another name for it. To propel a liquid, this pump combines the reciprocating action of a rubber, a Teflon diaphragm (which is otherwise thermoplastic), and appropriate valves on any face of the diaphragm. These pumps are widely utilized in a variety of industries to handle a variety of fluids. Fluids of high, low, or medium viscosities can be pushed by these pumps.

Types of Diaphragm Pumps

The diaphragm pumps are classified into different types such as


  • Air-Operated Pumps

  • Small Air-Operated Pumps
  • Small Motor Driven Pumps
  • Motor Driven Pumps
  • Wanner Hydra-Cell Pumps


Due to their compatibility with a wide range of liquids and chemicals, including food grade materials, connection types, and seals, Fluimac Air Operated Double Diaphragm Pumps (AODD) are utilized in a variety of sectors. 316 Stainless Steel, Polypropylene, PVDF+CF (Kynar + Carbon Fiber), POMc, and Aluminum are among the body materials.


Best use of the pumps

Diaphragm pumps are utilized in practically every industry that requires fluid transfer due to their versatility. They're commonly utilized for dewatering and water removal in a variety of sectors. Because of their efficiency and accuracy, they are utilized for filling, dispensing, and measuring.

They can generate a lot of pressure for spraying and cleaning, and they're frequently utilized in filter press applications. Slurries and sludges are no match for diaphragm pumps. They may generate up to 1200 bar of discharge pressure.

Because of their design, they offer excellent properties when running dry. They are utilized in the manufacture of artificial hearts since their action is comparable to that of a human heart. In most cases, they are self-priming and can achieve up to 97 percent efficiency. As long as they aren't undersized, they can handle the most viscous liquids in the business.

Pumps with a diaphragm have a high level of chemical and corrosion resistance. They can therefore be applied to any kind of viscous, acidic, or corrosive product.

Since this property, diaphragm vacuum pumps are frequently used in industries like the food business (for pumping fluids like water, chocolate, and syrups, for example), as well as the cosmetics and chemical industries (for creams and gels). Additionally, they are employed in the rotary evaporation and handling of volatile substances. They are also perfect for continuous operation.

Diaphragm vacuum pumps also have the benefit of being dry pumps. This means that maintenance expenses are significantly lower than with a rotary vane vacuum pump and that they do not require oil lubrication. The cost of these pumps, however, is quite high. Another crucial factor is that diaphragm pumps do not work well for freeze-drying since their vacuum level is lower than that of rotary pumps.


A liquid that has been centrifuged on the pump walls is supplied to operate liquid ring vacuum pumps. This results in a liquid ring that maintains the pump’s airtightness.

If you work in an industry like distilleries, petroleum refineries, power plants, mines, sugar factories, etc., liquid ring vacuum pumps can be quite advantageous. These vacuum pumps don't react badly when liquids, tiny solid particles, or vapors pass through them. Their isothermal compression is also perfect for heat-sensitive and explosive materials, ensuring a high level of safety. In addition to being used for vacuum filtering, moisture extraction, removing water from pulp during paper manufacturing, mineral recovery, and ash handling, liquid ring vacuum pumps can also be employed for these tasks.

The pumps of enormous power allow one to decrease and increase pressure with the help of maximum flow rate being 30,000 m³/h. One needs to pay attention to saturated vapor pressure of the liquid ring. The minimum pressure of the vacuum pump must not be lower than saturation pressure of the liquid ring, otherwise the liquid ring may vapourise. It makes vacuum pump air tight.

Everything You Need to Know About Cavitation in Diaphragm Pumps and to Avoid It


What is Cavitation in Diaphragm Pumps and Why Should We Care?

Diaphragm pumps are used in a variety of industries for their efficiency and reliability. However, these pumps can be subject to cavitation, which can cause damage and decrease their performance. Understanding the causes of cavitation, its effects on diaphragm pumps, and how to prevent it is essential for keeping your pump working optimally. In this article, we will discuss the basics of diaphragm pump cavitation, its effects on performance and damage, as well as strategies to avoid or reduce its impact.

It is a phenomenon which occurs in diaphragm pumps when the pressure of the liquid being pumped drops below its vapor pressure. This causes the formation of bubbles in the liquid, which then collapse as the pressure increases again. Cavitation can cause significant damage to diaphragm pumps, including reduced efficiency, decreased lifespan, and even complete failure if not addressed properly. It is therefore important to understand and take steps to prevent cavitation in diaphragm pumps.

Factors that Contribute to Cavitation in Diaphragm Pumps

What is Pump Cavitation?

Pump cavitation is a phenomenon that occurs when fluid passes through a pump and the pressure drops below the vapor pressure of the fluid. This causes the fluid to vaporize and form tiny bubbles of gas. As these bubbles move through the pump, they can cause damage to the impeller or other components of the pump. In extreme cases, cavitation can cause severe damage, leading to pump failure. It can also lead to a reduction in efficiency and increase in noise, vibration and heat. Additionally, it can lead to poor performance of hydraulic systems due to reduced flow.

Pump cavitation is a common challenge in many hydraulic systems, and the design of the system plays a critical role in avoiding it. Poorly designed suction pressure, incorrect diaphragm pump selection and other factors can all lead to problems with pump cavitation. Understanding these causes and designing the appropriate hydraulic system can help ensure that pumps continue to operate trouble-free.

How to prevent cavitation in diaphragm pumps?

Cavitation is a major concern for diaphragm pumps due to their reliance on suction pressure. Fortunately, there are several steps that can be taken to prevent it from occurring. This includes: -

  • Check the inlet conditions

                       Make sure that the inlet pressure is sufficient and that there are no obstructions or blockages that could impede the flow of liquid into the pump. This can help maintain a consistent pressure and prevent the formation of cavities

  • Ensure proper sizing

                            Make sure that the pump is properly sized for the application, taking into account factors such as the required flow rate and the viscosity of the liquid being pumped. An undersized pump can create a pressure drop that leads to cavitation.

  • Check the diaphragm

                           The diaphragm is a critical component of a diaphragm pump. Check it regularly for any signs of damage, such as tears or punctures, and replace it as needed. A damaged diaphragm can cause a drop in pressure and lead to cavitation.

  • Adjust the pump speed

                      Adjust the speed of the pump to maintain a consistent flow rate and prevent pressure drops. Increasing the speed can increase the flow rate and reduce the likelihood of cavitation.

  • Use a NPSH (Net Positive Suction Head) enhancer

                      In some cases, a NPSH enhancer can be added to the inlet of the pump to increase the pressure and prevent cavitation.

                             By following these steps, you can help prevent cavitation in a diaphragm pump and keep it running efficiently

What Are the Best Practices for Ensuring Proper Operation and Maintenance of Diaphragm Pumps?

Diaphragm pumps are an essential part of modern industry, and their operation and maintenance is critical to ensure optimal performance. Properly maintained diaphragm pumps can optimize performance parameters, such as Flow,Rate,Pressure,Temperature.

Cavitation is a common problem faced by diaphragm pumps. It occurs when the pressure in the pump drops below vapor pressure and causes bubbles to form in the liquid being pumped. This can cause damage to the pump and reduce its efficiency. To avoid cavitation, it is important to choose a high-quality diaphragm pump from reliable suppliers like Seltec who are the leading diaphragm pump suppliers in UAE.

Seltec provide pumps with features such as low NPSH (Net Positive Suction Head) requirements, high-efficiency motors, and corrosion resistant materials that help prevent cavitation. Additionally, proper installation techniques, maintenance schedules, and regular inspections should be followed to ensure that cavitation does not occur.

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