How to choose right material for Diaphragm Pumps ?

Published by Industrial Pump Parts Hamilton, Ontario Canada

When choosing the right material for a diaphragm pump, several factors should be considered, such as the chemical compatibility of the material with the fluid being pumped, the temperature and pressure of the fluid, and the cost of the material. 

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The most common materials used for diaphragms in pumps include: 

• Nitrile rubber (NBR): A synthetic rubber that is resistant to oil, fuel, and chemicals. It is commonly used for pumping fuels and lubricating oils. 
• EPDM rubber: A synthetic rubber that is resistant to water, steam, and chemicals. It is commonly used for pumping water and other aqueous solutions. 
• Fluorocarbon (FKM or Viton®): A synthetic rubber that is resistant to high temperatures and chemicals. It is commonly used for pumping high-temperature fluids and aggressive chemicals. 
• Teflon (PTFE): A fluoropolymer that is resistant to chemicals, high temperatures, and high pressures. It is commonly used for pumping aggressive chemicals and high-purity fluids. 

If the fluid being pumped is not highly corrosive or abrasive and is being pumped at relatively low temperatures and pressures, nitrile rubber or EPDM rubber may be a suitable choice. However, if the fluid is highly corrosive or abrasive, or is being pumped at high temperatures and pressures, a fluorocarbon or Teflon diaphragm may be a better choice. 

It's also important to consider the cost of the material. Some materials, like Teflon, can be more expensive than others. Therefore, it's important to balance the cost of the material with the benefits it provides in terms of chemical resistance and durability. 

In summary, when choosing the right material for a diaphragm pump, it's important to consider the chemical compatibility of the material with the fluid being pumped, the temperature and pressure of the fluid, and the cost of the material. Nitrile rubber and EPDM rubber are suitable for pumping fluids at low temperatures and pressures, while Fluorocarbon and Teflon are suitable for pumping fluids at high temperatures and pressures and for aggressive chemicals.