What Is Micro Liquid Diaphragm Pump?

Table of Contents

Micro liquid diaphragm Pump image

Micro liquid diaphragm pumps are self-priming pumps used for pumping fluids against high system pressures. They’re maintenance-free, dry-running, and can be connected to a number of hydraulic systems and motors.

Liquid diaphragm pumps are commonly used in high-pressure industrial applications such as inkjet printing systems. They have high chemical resistance and can move almost every liquid, whether corrosive or neutral. With flexible materials and features such as high speed, valves, stroke, elastomer selection, and pulsation chambers, miniature liquid diaphragm pumps are tailored to precisely match the medium.

This article will continue to discuss everything about micro-liquid diaphragm pumps from the following aspects.

What Does A Micro Liquid Diaphragm Pump Mean?

Micro liquid diaphragm pumps are positive displacement pumps that transfer liquids using a combination of reciprocating action and internal valves. They can move air, liquid, or a combination of the two.

They are extremely dependable since they lack internal parts that come into contact to cause friction. Also, the pumping head doesn’t need lubrication oils that can contaminate the media. They are robust and can handle even liquids with high solid content.

How Does A Micro Liquid Diaphragm Pump Work?

Micro diaphragm liquid works

The pump’s flexible diaphragm is moved by the action of an eccentric on the motor shaft. The fluid is forced into the pump chamber on the downstroke and ejected on the upstroke. The internal valves in the pumping head monitor and control the direction of the flow.

What Are The Main Features Of A Micro Liquid Diaphragm Pump?

Low pulsation mode

Liquid pumps are suitable for applications that demand a smooth flow and low pulsation. The unique drive eliminates or reduces pulsation without the need for costly surge tanks or dampeners.

Variable flow rate

These pumps are appropriate for systems that require vacuum up to 8m suction height and operating pressures up to 4 bar. Flow rates range from 0.0064 cfm to even more than 0.0634 cfm.


A liquid pump can be utilized in a wide range of applications so long as the pump materials are compatible with the media.

What Are The Advantages Of A Micro Liquid Diaphragm Pump?

The benefits of micro liquid diaphragm pumps include;


These pumps are self-priming with exceptional suction capabilities. There is no need to install extra equipment to ensure consistent flow.

Dry running

The pump’s design allows it to run dry continuously without causing any damage to its inner parts or diaphragms. Whenever there is no fluid supply, the pump goes dry, the difference in pressure between the fluid and air sides of the membranes causes them to disconnect from the drive; the drive remains stationary and moves continuously.

Low maintenance costs

Liquid pumps are designed without any sensitive parts, and their diaphragms can last for very many years. Also, additional deadhead protection devices like pressure sensors are not necessary.

Wide operating range

Liquid pumps are adaptable to any operation and can handle abrasives, slurries, shear-sensitive materials, and a wide range of chemical compounds.


Generally, these compact size pumps are safe, durable, and explosion-proof when grounded properly in accordance with local codes.

Best Uses For Micro Liquid Diaphragm Pumps

Mini liquid diaphragm pumps are employed in almost every sector that requires fluid transfer due to their versatility. These pumps are used to move liquids such as caustic chemicals, viscous fluids, volatile solvents, gels, and oils.

They can handle fluids with low, medium, or high viscosities. Due to their precision and efficiency, they are used for dispensing, filling, and metering. They can generate a lot of pressure for spraying and cleaning, and they’re frequently employed in filter presses. Liquid pumps will perform best for harsh chemicals and dirt-free liquids in industrial applications.

How Do You Maintain Your Micro Liquid Diaphragm Pump?

A micro liquid pump, too, can fail, just like any other industrial pump. For reliable operations, these pump systems must be correctly installed and maintained.

Top pump maintenance tips include;

Avoid extremely high pressures

Most micro liquid pumps are rated for air pressure of up to 8 bar. If your pump’s pressure rises over 8 bar, the diaphragm will most certainly break, causing internal damage to the pump as media leaks into the main body.

Ensure pump compatibility

Always ensure that the media is compatible with the materials used to design the pump. If the media is incompatible, it can lead to excessive wear or even failure of the major components.

Reduced vibration

Ensure your pump is properly installed. One of the most crucial aspects of pump installation is mounting the pump to a stable surface with anti-vibration feet. Vibrations can always lead to pump leakages.

Avoid operator misuse

Operator misuse can have a significant impact on your pump’s lifespan. Always ensure that the right medium is used. Also, examine the inlet and outlet sealing on a regular basis for signs of wear.

Inspecting and tightening bolts on a regular basis

The main bolts holding the system together should be examined and adjusted to the exact torque setting at least once a week to prevent leakage.

How Do You Know What Type Of Micro Liquid Diaphragm Pump To Buy?

While selecting the right pump for your project can be very challenging, there are only five factors you need to consider.

Factors to consider when choosing the right pump for your application;

  • Pressure – Evaluating the potential pressure levels at the pump’s outlet and inlet will help in choosing the right equipment.
  • Flow rates – To choose the right small pump, you must first evaluate the flow rate, which is measured in gallons per minute.
  • Media – Understand the chemical composition and weight of the fluid to avoid wear and corrosion.
  • Viscosity – To transfer very viscous fluids, powerful pumping equipment is required. Always use a fluid that is less viscous than motor oil.
  • Temperature – Examine the fluid’s temperature. The pump material that matches your specific application will be determined by the temperature of the fluid.


The paragraphs above have illustrated how the robust nature of micro liquid diaphragm pumps makes them ideal for different applications. With their simple designs, micro liquid pumps are easy to install and operate – they can handle a variety of fluid viscosities. Again, with the factors discussed above, you can now easily acquire the right liquid pump from any reputable supplier. Shenzhen Boden, among other top manufacturers, will provide you with quality liquid pumps and accessories.

Author photo of Jean Qiao, Project Manager at bodenpump.com

Note: All content and images in this article are original creations of BODENFLO. For permissions to reprint or use any articles or images, please contact the author.

Ask For A Quick Quote

Woman at Bodenlo

Ask For A Quick Quote

We will contact you within 8 hours, please pay attention to the email with the suffix “@bodenpump.com”