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A Guide to Double Diaphragm Pumps and Choosing the Right Diaphragm Material!

By StatusMessagesQuotes Aug 24, 2023
Double Diaphragm Pump Guide: Choose the Right Diaphragm Material

When it comes to transporting fluids, double diaphragm pumps have become vital, particularly in industries ranging from manufacturing to wastewater treatment. These adaptable devices can handle a wide range of liquids, including corrosive, abrasive, and viscous liquids. The diaphragm, a critical component of these pumps, plays a critical role in their operation. 

In this article, you will learn the fundamentals of Double Diaphragm Pumps, including how they function, and how to select the best diaphragm material for your individual application.

What is a Double Diaphragm Pump?

At its core, a double diaphragm pump is a type of positive displacement pump. Unlike centrifugal pumps, which use impellers to move liquids, double diaphragm pumps rely on reciprocating diaphragms to create a pumping action. These pumps are incredibly versatile and are designed to handle various types of fluids, including corrosive, abrasive, and viscous materials.

How Does it Work – The Process Explained!

The operation of a double diaphragm pump is elegantly simple yet highly effective. It consists of two flexible diaphragms, typically made from materials like rubber or thermoplastic. These diaphragms are situated on either side of a central chamber, with a set of check valves controlling the flow of fluid. Here’s how the process works step by step:

Diaphragm Compression: When the pump is activated, compressed air is introduced into one chamber, causing the diaphragm to flex outward. This action reduces the pressure in the chamber, creating a vacuum effect.

Suction Phase: As the vacuum is created, the diaphragm on the opposite side is drawn inward, causing the chamber to expand and draw in fluid through the inlet check valve.

Discharge Phase: Once the diaphragm reaches its maximum travel distance, the compressed air switches to the opposite chamber. This change in air pressure pushes the diaphragm back to its original position, expelling the fluid through the outlet check valve.

Repetition: This cycle repeats continuously, creating a steady flow of fluid through the pump.

One of the key advantages of double diaphragm pumps is that they can handle viscous, abrasive, and even solids-laden fluids with ease. They are also self-priming, meaning they can start pumping without the need for manual priming, and they can run dry without causing damage.

Choosing the Right Diaphragm Material: Ensuring Pump Performance and Longevity

When it comes to selecting a diaphragm for your pumping application, it’s not just about the size or type of pump you need. The choice of diaphragm material is a crucial decision that can significantly impact pump performance and longevity. In this section, you will get to know the importance of picking the right diaphragm material according to the type of fluid being pumped and the operating conditions.

How Does Diaphragm Help in Pumping Operations?

First, let’s establish the vital role that diaphragms play in a pump’s operation. Diaphragms are the workhorses of pumps, responsible for creating the necessary pressure changes that move fluids. They do this by flexing in response to the pumping action, alternately expanding and contracting to draw in and expel fluids. Given this pivotal role, the material from which diaphragms are made becomes crucial.

Why does Diaphragm Material Matter?

Compatibility with Fluid: Different fluids have different chemical compositions and properties. Some are corrosive, some are abrasive, and some are viscous. The diaphragm material must be compatible with the pumped fluid to avoid corrosion, deterioration, or contamination. Using the wrong material can lead to costly damage and leaks.

Operating Conditions: The temperature, pressure, and mechanical stress a diaphragm will face during operation must be considered. Diaphragms need to withstand a range of conditions without tearing, deforming, or becoming brittle.

Longevity: The choice of diaphragm material directly affects the lifespan of the pump. Using the right material can extend the life of your diaphragm, reducing maintenance costs and downtime.

Common Diaphragm Materials Are Discussed Below!

Rubber: Natural rubber and synthetic rubber materials like neoprene and Buna-N are often chosen for their flexibility, resilience, and chemical resistance. They are suitable for a wide range of fluids, including water, oil, and mild chemicals.

PTFE (Teflon): PTFE diaphragms are highly resistant to chemicals, making them ideal for corrosive fluids. They can handle extreme temperatures and are known for their durability.

EPDM (Ethylene Propylene Diene Monomer): EPDM diaphragms are excellent for applications involving hot water and steam. They have good resistance to acids and alkalis. Also, this propylene material is used in PP Aodd Pumps.

Santoprene: This thermoplastic elastomer combines the flexibility of rubber with the chemical resistance of plastics. It’s often chosen for abrasive or viscous materials.

How to Select the Right Material for Double Diaphragm Pump?

Choosing the right diaphragm material starts with a thorough understanding of your application. Consider the type of fluid you’re pumping, the temperature and pressure requirements, and any chemical interactions that may occur. Also, evaluate the diaphragm’s expected lifespan and the maintenance schedule you’re willing to undertake.

Consulting with the leading Double Diaphragm Pump Suppliers in India who are experts in diaphragm pump technology can be invaluable. They can provide guidance and recommend the most suitable material for your specific needs, helping you achieve optimal pump performance and longevity.


Double diaphragm pumps are a workhorse in many industries, but their effectiveness relies heavily on choosing the right diaphragm material. By considering factors like chemical compatibility, temperature resistance, and abrasion resistance, you can select the material that best suits your application’s needs. Always consult with the best Double Diaphragm Pump Manufacturers in India to ensure you make the right choice.

Nirmala Pumps & Equipments is the leading brand, manufacturing and supplying these DDPs in different specifications. Contact us today to discuss your double diaphragm pump and PP Aodd Pump requirements. 

By StatusMessagesQuotes

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