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Before moving on to the diaphragm dosing pump, which is one of the types of dosing pumps, it is useful to give information about what a dosing pump is. The devices used to deliver chemical liquids such as various acids, liquid fertilizers, chlorine, enzymes, etc. to any flow line, tank, process, etc. in a determined amount depending on time are called dosing pumps. Dosing pump; It is designed for use in areas such as drinking water, chemical processes, food processing, medical production, livestock and swimming pools. The dosing pump, which is used to move liquids according to a predetermined flow within a certain time, is also called a metering pump. Dosing pumps used in many parts of the industry paved the way for the production of different pump designs with new and different working areas.

Dosing Pump Types

 Dosing pump is divided into 3 types  according to the usage area and the characteristics of the liquid to be transferred.

1. Manual and Non-Energized Dosing Pumps Connected to Water Flow: Liquid chemicals; pool, agricultural irrigation, animal husbandry, metalworking, printing, etc. It is a dosing pump designed to be given proportionally in the sectors. It does not need any energy source to work. It dose the chemical liquid proportionally depending on the water flow rate.

2. Motorized Dosing Pumps: These pumps need an electric motor to work. Mechanically, a dosage adjustment between 0% and 100% is available on all pumps. In addition, it has various options to be controlled from automation and to operate automatically according to needs. Piston, mechanical diaphragm and hydraulic diaphragm dosing pump versions are available.

3. Solenoid (Electromagnetic) Dosing Pump: Electromagnetic dosing pump, which is a very common model, works according to the diaphragm pump technology and the solenoid driven working principle. The most outstanding feature of the diaphragm dosing pump is that it can make different dosing adjustments for every day of the week and every hour in digital models. This model, which is preferred for its easy use, has plastic and stainless steel body variants. It is preferred for dosing high amounts of chemical liquids with the most precise measurements.

Double diaphragm dosing pumps used for dosing or transfer purposes are divided into 2: Air Operated Diaphragm Pumps and Electric Diaphragm Pumps.

● Air Operated Diaphragm Pumps ( AODD ): These pumps are used in areas with compressed air in the range of 2-8 bar. Pumps with a compression ratio of 2:1, 3:1 or 4:1 with a pressure range of 15-20 bar are also available. These are high pressure air operated diaphragm pumps. Compressed air is directed directly to the air inlet of the pump by special means. Thus, the movement of the opposing diaphragms located in the interior takes place. The two diaphragms inside the air pumps stay connected by a shaft. Pressure is realized through the chambers and ball valves located in the inner part of the diaphragm. The chambers in the air diaphragm pumps provide the pressure by vacuuming the liquid together with the movement of the diaphragm. System; continues to operate as long as there is a compressed air source. Ball valves, on the other hand, provide ideal suction or discharge of liquid. It is preferred because it does not need electricity to work and has a practical and easy system.

● Electric Operated Diaphragm Pumps (EODD) : Although they have many common features with air diaphragm pumps, the main difference is that they operate with electricity, providing precise dosage transfer, and dosage adjustment can be made by controlling the electric motor. Electric diaphragm pumps come to the fore in terms of energy efficiency and performance. It provides a balanced and shock-free flow, it is much quieter. Electric diaphragm pumps are also available in models with ATEX certification.