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Diaphragm pump


Diaphragm pumps in boiler systems are specifically designed to handle the transfer and dosing of various chemicals. Which are essential for maintaining water quality and preventing scale and corrosion in the boiler. These pumps are crucial components in boiler water treatment systems.


Diaphragm pumps are known as membrane pumps or pneumatic diaphragm pumps, which are a type of positive displacement pump used to move fluids. They are characterized by their unique design. Which involves a flexible diaphragm that moves back and forth to create a pumping action. Moreover, they are versatile, reliable, and able to handle a wide range of fluids, including corrosive, abrasive, and viscous liquids. According to that, various industries and applications usually use them for suitable purposes.

Air-Operated Diaphragm Pump Pneumatic Double Diaphragm Pump
Diaphragm Pump


  • Diaphragm: The diaphragm is the central component of the pump. It is typically made of a flexible material such as rubber, thermoplastic, or metal. The diaphragm separates the fluid being pumped from the mechanical components of the pump. When the diaphragm moves, it creates a positive and negative pressure cycle, which results in the suction and discharge of fluids.
  • Pumping Mechanism: They use various mechanisms to move the diaphragm. Common methods include pneumatic (using compressed air or gas), mechanical (using a cam or crankshaft), or hydraulic (using pressurized fluid) actuation.
  • Check Valves: Diaphragm pumps usually have two check valves, one on the suction side and one on the discharge side of the pump. These valves ensure that fluid flows in one direction, preventing backflow.
  • Inlet and Outlet Ports: Diaphragm pumps have inlet and outlet ports where the fluid enters and exits the pump. The design and size of these ports can vary depending on the specific application and requirements.
  • Drive Mechanism: The drive mechanism, whether it’s pneumatic, mechanical, or hydraulic, is responsible for moving the diaphragm. This movement creates suction on one side of the diaphragm, drawing in the fluid, and then pushes the fluid out when the diaphragm moves in the opposite direction.


  • Versatility: Diaphragm pumps can handle a wide range of fluids, including corrosive chemicals, viscous substances, abrasive slurries, and even solids in suspension.
  • Self-priming: Diaphragm pumps are typically self-priming, meaning they can draw fluids into the pump without needing external assistance.
  • Dry Running: These pumps can often run dry without damage, making them suitable for applications where intermittent flow or dry-run conditions are common.
  • Containment: The diaphragm provides a high level of containment. Which is preventing cross-contamination between the fluid and the outside environment.
  • Low Maintenance: Thanks to their simple design, these pumps are reliable and have low maintenance requirements.


In summary, diaphragm pumps find applications in various industries, including chemical processing, water treatment, and more. They are particularly suitable for transferring fluids, which may be sensitive to contamination or require gentle handling. It’s essential to select the appropriate type of diaphragm pump based on the specific requirements of your application, as different designs and materials are available to accommodate various fluid properties and operating conditions.


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