Dosing Pumps and Dosing Systems

Dosing pump

The process of adding an additive into the fluid at a certain rate in a certain time period is generally called as dosing in a process. The equipment used to perform this process is called the dosing pump. Dosing pumps are widely used in water treatment systems, agricultural applications, manufacturing industry and also widely used in many fields such as chemistry, medicine, mining and food. Different dosing pump models are seen in the industry depending on different dosing systems and applications. Among these models, as well as motor and electromagnetic pumps, non-electric dosing pump types are frequently used in many fields.

Dosing Pump Types and Working Principles

Different dosing pumps are used according to the demands of the chemical dosing systems (pressure, flow, chemical type, etc.). We can list these pumps as follows:

• Fixed injection diaphragm pump: These pumps use a diaphragm, piston and valves to provide flow movement. With the movement of the piston, the liquid is drawn into the pump and a certain chemical is injected into the liquid at a preset speed. Some models in this category also have variable dosing speed.
• Pulse injection diaphragm pump: This model, which appears as an affordable but low-precision dosing pump, works with the following principle: While the fluid to be injected by the chemical product is moved by the diaphragm movement, the injection of the chemical is carried out through a solenoid coil in the time interval between the pulses. This model, which has a very simple mechanical and electronic design, can be preferred for applications that do not require much precision.
• Lobe pumps: In these pumps, the liquid volume is provided by gear wheels inside the pump which are called as lobe. This volume is generally not as precise and accurate as diaphragm pumps. Therefore, the use of lobe dosing pump is mostly seen in the dosing of high viscosity and self-lubricating chemicals.
• Peristaltic pumps The most precise dosing process is provided with these pumps. There is a flexible pipe bent inside the pump and the fluid flows through this pipe through peristaltic movements. These pumps have a much wider usage than other models.
• Mono pump: Mono pumps known as screw, worm screw or progressive cavity pump are widely used as dosing pump. With the power transferred from the motor, the transfer of the fluid by rotating the rotor and stator main materials ensures a precise, stable and smooth flow.

Non Electric Dosing Pump and Features

These pumps, which have a very simple yet effective design among dosing pumps, do not require electricity to work, as the name suggests. Water flow is sufficient for these pumps, which are very simple to install and commission, to operate. It is also very easy to adjust the dosing rate with these pumps. Another feature that makes the non-electric dosing pump effective for dosing processes is that the pump can be used with different materials for different chemicals. For example, if an acid metering is to be made and metal material is used in the pump, plastic materials of these pumps may be preferred for this application. In addition, there are different pump types according to different water flow rate and different dosdosing rates. The water flow rate is generally from 1 m³ / h to 25 m³ / h; The metering rate depends on the pump, but it can vary from 0.1% to 10%.