Last updated: August 16, 2021

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Welcome to our big dosing pump test 2022. Here we present all the dosing pumps we have tested and their various areas of application. We have compiled detailed background information for you and also provided a summary of customer reviews on the Internet. In this way, we would like to make it easier for you to make a purchase decision when buying a dosing pump and help you to make the right choice for you.

You will find helpful answers to frequently asked questions in our guide. We have also included interesting test videos. Furthermore, you will also find some basic information on our page that you should definitely pay attention to if you want to buy a dosing pump.




Summary

  • Dosing pumps are so-called positive displacement pumps that deliver a predefined volume per revolution, stroke or time, regardless of the existing pressure conditions at the inlet and outlet of the pump.
  • Many different dosing pumps are offered on the market for a wide range of applications. The range includes dosing pumps for everyday home use as well as dosing pumps for professional use.
  • Nowadays, a dosing pump is part of practically every household and has become more and more established in recent years as useful basic equipment in a wide variety of areas.

The Best Dosing Pump: Our Picks

Guide: Questions you should ask yourself before buying a dosing pump

What is a dosing pump?

Dosing pumps ensure a precisely defined volume of liquid is sucked in during the return stroke of the displacer and conveyed into the dosing line due to the subsequent pressure. Due to the pressure difference, a suction valve opens and the pumped liquid is sucked into the corresponding working chamber.

The suction valve closes by its own mass or by an additionally installed spring. During the forward movement of the displaced fluid, the working chamber is minimised accordingly and this in turn increases the pressure. When the pressure has increased slightly compared to the counterpressure, the pressure valve opens and the previously sucked-in volume of liquid is expelled.

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A dosing pump in daily laboratory use
(Image source: unsplash.com/Chromatograph

What are the different types of dosing pump?

To find the ideal dosing pump, you should give some thought to the applications for which you want to use it. The capacity range can vary from a few millilitres in the laboratory or daily home use up to 4,000 litres per hour in complex process technologies.

Accurate dosing is necessary in many industrial processes in the field of cleaning

Since manual dosing involves a large number of sources of error and is also very time-consuming, these tasks are performed by machines. Dosing pumps thus combine economy with optimum effectiveness.

A high degree of reliability in terms of quantity accuracy is an important criterion for a dosing pump. Even a small deviation in the dosing quantity due to a temperature-related change can cause too many rejects, as you may have experienced yourself in application and spraying applications.

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Regardless of whether you have a saltwater or freshwater aquarium. A dosing pump guarantees the supply of any kind of nutrients
(Image source: unsplash.com/Joshua Dewey)

Dosing pumps are also very useful if you own an aquarium. Here you have the choice of simple single-channel dosing pumps up to 6-channel systems. These pumps are used to balance the permanent consumption of calcium, carbonate hardness and magnesium.

To do this, the consumption is determined over a few days and the dosing pump is perfectly adjusted to the quantities consumed and then added to the aquarium at regular intervals.

What are the different pump drives for a dosing pump?

There are different types of pump drives for dosing pumps, which we briefly summarise for you here:

  • Diaphragm dosing pump
  • Solenoid metering pump
  • Motor-driven metering pump
  • Pneumatic dosing pump
  • Hydraulic dosing pump

Decision: What types of dosing pump are there and which is the right one for you?

If you want to buy a dosing pump, there are several alternatives to choose from.

  • Diaphragm pump
  • Peristaltic pump
  • Reciprocating pump
  • Gear pump

The use of the different dosing pumps has its advantages and disadvantages.

Depending on the area of application in which you want to use the dosing pump, a different type is suitable for you. In the following section we would like to make your decision as easy as possible.

What is a diaphragm pump and what are its advantages and disadvantages?

A diaphragm pump is a device for pumping liquids and gases. It is used where a leak-free pump design is particularly important. Diaphragm pumps are also available as vacuum pumps, which are used especially when the vacuum must be oil-free.

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Diaphragm pumps have become indispensable in today's process engineering
(Image source: unsplash.com/Chromatograph)

Since diaphragm vacuum pumps are very insensitive in comparison, they have established themselves as standard pumps in chemistry and process engineering.

Advantages
  • insensitive to continuous stress
  • shielding from impurities
Disadvantages
  • not suitable for high pressure
  • limited applications

What is a peristaltic pump and what are its advantages and disadvantages?

A peristaltic pump is a so-called positive displacement pump in which the medium to be pumped is conveyed out through a hose by mechanical deformation of the hose.

The hose is supported on the outside of the pump knob housing and is clamped on the inside by rollers that rotate on a rotor and are moved by a camshaft. This movement ensures that the pinch-off point moves along the hose and thus propels the pumped medium.

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Illustration of a peristaltic pump.
(Image source: pixabay.com/pashminu)

Peristaltic pumps differ from so-called dry-running pumps with a working pressure of approx. 2 bar, where there is no lubricant in the pump head, to 16 bar, where the pump head is filled with a lubricant that also serves as cooling.

Advantages
  • suitable for continuous operation
  • no valves required
  • accurate metering of small flow rates
Disadvantages
  • short hose life
  • contamination possible when the hose is driven off
  • no constant flow rate

What is a reciprocating pump and what are its advantages and disadvantages?

A reciprocating pump is a positive displacement pump in which a piston performs a linear stroke movement. It usually consists of a piston running in a cylinder and an inlet and an outlet, each closed by a valve.

During suction, the piston moves and the inlet valve opens and the pumped medium flows into the cylinder. During the delivery movement, the valve closes again and the piston moves back and the outlet valve opens and the pumped medium is pushed out.

Advantages
  • long service life
  • low energy costs
Disadvantages
  • high purchase price
  • limited areas of application

Reciprocating pumps are mainly used for pumping liquids or gases. High pressures can be achieved and the volume of liquid pumped can be determined more precisely.

What is a gear pump and what are its advantages and disadvantages?

A gear pump is used for pumping liquids and for the power-transmitting drive of hydraulic motors. It consists of a housing with inlet and outlet and two gear wheels.

A gear pump ensures the uniform delivery of the medium to be pumped and can withstand pressures of up to approx. 300 bar. The principle of the gear pump is: If the load increases, the pressure also increases.

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Gear pumps are widely used, especially in the automotive industry
(Image source: unsplash.com/Peter Gonzalez)

Gear pumps are used in the plastics industry to meter liquid paint under pressure into the molten plastic. Furthermore, they are used to drive hydraulic motors and vehicle construction.

Advantages
  • high reliability
  • high metering accuracy
Disadvantages
  • limited flow rate
  • low maximum pressure

What alternatives are there to a metering pump?

In principle, there is no real alternative to dosing pumps. Manual dosing in a variety of applications involves a wide range of inaccuracies and sources of error and is simply not possible for more complex tasks.

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Manual dosing involves less accuracy and greater sources of error
(Image source: unsplash.com/Alex Kondratiev)

Buying criteria: These are the factors you can use to compare and evaluate a dosing pump

In the following, we will show you which aspects you can use to decide between the many possible dosing pumps. The market offer is very large and includes many different areas of application.

The most important criteria when buying a dosing pump would be:

Now determine the intersection of the delivery rate in litres per hour and the back pressure in bar to find out the right pump type for your area of application.

Delivery rate in litres per hour

In many cases, dosing pumps form a functional unit with measuring, control and dosing systems. Low-pressure dosing pumps deliver small quantities in the range of a few millilitres up to 75 litres per hour and thus largely cover most dosing tasks.

Motor-driven diaphragm metering pumps achieve a metering capacity of up to 1,000 litres per hour and thus ensure safe process sequences even with maximum requirements.

The back pressure in bar

A fundamental part of dosing pumps is clearly the pump. Adapted to the respective dosing medium, the pump is responsible for the smooth dosing process.

Low-pressure dosing pumps cover almost all dosing tasks with a counterpressure of up to 60 bar.

Motor-driven diaphragm metering pumps are in the performance range of about 16 - 4 bar and work with high precision over the entire frequency range.

Accessories

A dosing pump alone is often not enough and you need other components that are used in the dosing process. In the table below, we list the most important accessories to give you a better overview.

Accessories Components
Flow meter Suction set
Dosing container Drain tap
Agitator Timer for agitator
Signal horn Indicator lamp
Manometer Pressure maintenance valve

All these components ensure an optimal process flow and can be expanded with various connections, from Bluetooth to WLAN, for easier configuration and retrieval of process data.

Trivia: Interesting facts about dosing pumps

How do I use a dosing pump for my aquarium?

Plug the socket of the power supply unit into the connection of the dosing pump. Then connect the mains cable of the power supply unit to a socket.

The dosing pump must be placed horizontally above the containers with the liquids to be dosed. The dosing pump must be protected from splashing water and high humidity.

A position in the direct vicinity of the filter basin is therefore not normally possible. Place the left hose of the pump in the liquid container and the right hose in a measuring cylinder with at least 100 ml volume and start the process.

Image source: Huy Phan / unsplash.com

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