Modern solutions require extraordinary precision. This applies not only to electronic systems, but also to hydraulic systems. Dosing pumps allow for very precise determination of the amount of liquid flowing and its pressure. In this way, the quality of manufactured products is much higher, and the composition of the mixtures is within a very small tolerance. How do dosing pumps work and when are they used in industry? More on this in the article below.
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What is a dosing pump?
The purpose of a dosing pump is to deliver a precisely defined amount of fluid or working fluid to the system. How does this type of device work? When the solenoid valve opens, the electromagnet attracts the membrane, creating space for a precisely defined amount of substance. Then the valve closes, and the spring mechanism returns the membrane to the correct position, pushing the measured amount of agent into the system. By quickly repeating the entire scheme, it is possible to pump large amounts of liquid, while ensuring their precise dosing.
Dosing pump functions
When choosing a diaphragm pump, it is worth considering which of its functions are most important in a given application. What to look for?
- The basic function of each metering pump is to measure the liquid or gas fed into the system. However, each model is characterized by a different measurement accuracy - from very precise pharmaceutical pumps to less accurate industrial devices.
- The speed of metered agent delivery is important. That is why many models allow manual adjustment of the pumping rate.
- In addition to setting the amount of dosed substance, you can also program the pump's operating time. This is an important parameter in precision applications: laboratories or pharmaceuticals.
In special cases, additional functions may also be important, which are only used in individual models and are related to their narrow application.
When is it worth installing a dosing pump?
Where do you find such solutions? The first association is certainly pharmaceuticals - diaphragm metering pumps are in fact an essential element of many installations in this industry. However, they are also used in:
- Water wastewater treatment plants and drinking water treatment plants.
- Textile industry.
- Paper industry.
- Pulp industry.
- The food industry, including the production of beverages and dairies.
These are the most popular examples, but diaphragm dosing pumps can also be used in many other areas, and even in single-family homes, for example in fish aquariums.
Dosing pumps in the Onninen offer
Due to the operating characteristics, each type of dosing pump will have a slightly different application. This depends not only on the precision of the liquid measurement, but also on the flow rate and size of the device itself. To better illustrate this, we present three models of Grundfos diaphragm pumps below.
Grundfos SMART Digital DDC 6-10A diaphragm dosing pump
The small power (22 W) of the Grundfos SMART Digital DDC 6-10A dosing pump is worth noting. It is also characterized by high durability and high efficiency while maintaining maximum precision of dosing subsequent doses. It can work as a pressure or vacuum pump, and all parameters are programmed by the user (mainly the operating time and the amount of dosed substance). This model can be used both in home conditions, as well as in industry or research laboratories. It works well in dosing chemicals and pharmaceuticals.
Grundfos DMX 160-5 B-SS/V/SS diaphragm dosing pump
Several times larger, and therefore much more efficient, Grundfos DMX 160-5 B-SS/V/SS dosing pump is perfect for disinfection, coagulation, flocculation and precipitation of substances in industrial applications. Important advantages of diaphragm pumps are high durability and strength, and at the same time no need for frequent maintenance and service repairs.
Grundfos SMART Digital DDE 6-10B diaphragm dosing pump
The last example from the manufacturer Grundfos concerns another small, compact dosing pump. In this case too, a diaphragm mechanism is used, but it works with a stepper motor, ensuring optimal operation of the device. Using the full stroke of the mechanism makes it easy to measure even degassing or highly viscous liquids. The Grundfos SMART Digital DDE 6-10B diaphragm pump offers primarily manual operation with the possibility of adjustment from 0.1 to 100%.
It is worth paying attention to the construction of the head of this model. The PTFE membrane is durable and chemically resistant, which is also responsible for its versatility. In turn, two balls are placed in the valves to ensure maximum precision in measuring the set amount of liquid. Additionally, the device has its own venting, which facilitates the first start-up of the dosing pump. A great convenience is the mechanical lock of the device.