Modern solutions require extraordinary precision. This applies not only to electronic systems, but also to hydraulic systems. Dosing pumps allow for very accurate determination of the amount of flowing liquid and its pressure. In this way, the quality of the manufactured products is much higher and the composition of the mixtures is within very small tolerances. How do dosing pumps work and when are they used in industry? More about this in the article below.
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What is a dosing pump?
The task of the dosing pump is to deliver a precisely defined amount of fluid or working liquid 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. The valve then closes and a spring mechanism returns the diaphragm to its proper position, pushing a measured amount of agent into the system. By quickly repeating the entire pattern, 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 what functions are most important in a given application. What to look for?
- The basic function of each dosing pump is to measure the liquid or gas fed into the system. However, each model is characterized by different measurement accuracy - from very precise pharmaceutical pumps to less accurate industrial devices.
- The speed of administration of the metered factor is important. Therefore, many models allow you to manually adjust the pumping rate.
- In addition to setting the amount of the dosed substance, you can also program the pump operating time. This is an important parameter in precise applications: laboratories or pharmaceuticals.
In special cases, additional functions that are used only in single models and are associated with their narrow application may also be important.
When is it worth installing a dosing pump?
Where can you find this type of solutions? The first association is certainly pharmaceuticals - diaphragm dosing pumps are in fact an indispensable element of many installations in this branch of the economy. However, they are also used in:
- Water sewage treatment plants and drinking water treatment.
- Textile industry.
- Paper industry.
- Pulp industry.
- Food industry, including the production of beverages and the operation of 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 aquariums with fish.
Dosing pumps in the Onninen offer
Due to its operating characteristics, each type of dosing pump will have a slightly different application. This depends not only on the precision of liquid measurement, but also on the flow rate and the size of the device itself. To better illustrate this, below are three models of Grundfos diaphragm pumps.
Grundfos SMART Digital DDC 6-10A diaphragm dosing pump
Noteworthy is the low power (22 W) of the Grundfos SMART Digital DDC 6-10A dosing pump . It is also characterized by high durability and high efficiency while maintaining maximum precision in portioning subsequent doses. It can work as a pressure or vacuum pump, and all parameters are programmed by the user (mainly operating time and the amount of dosed substance). This model can be used both at home and in industry or research laboratories. It is suitable for dosing chemicals and pharmaceuticals.
Grundfos DMX 160-5 B-SS/V/SS diaphragm dosing pump
Several times larger, and therefore much more efficient, the 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 durability, and at the same time no need for frequent maintenance and service repairs.
Grundfos SMART Digital DDE 6-10B diaphragm dosing pump
The latest example from the manufacturer Grundfos concerns another small, compact dosing pump. Also in this case, a membrane mechanism is used, but it cooperates with a stepper motor, ensuring optimal operation of the device. The use of the full stroke of the mechanism makes it easier to measure even degassing or highly viscous liquids. The Grundfos SMART Digital DDE 6-10B diaphragm pump offers primarily manual operation, adjustable 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 also makes it universal. Two balls are placed in the valves to ensure maximum precision in measuring the given amount of liquid. Additionally, the device has its own air vent, which facilitates the first start-up of the dosing pump. The mechanical lock of the device is a great convenience.