Dosing Pumps

This is a volumetric pump designed to accurately pump liquids or chemicals into water, steam, or gas…

The device’s method of operation is to draw a measured amount of liquid into the chamber and then inject that liquid into a pipe or tank.

In industry, the metering pump is an indispensable device in the automatic chemical dispersion process and is widely equipped in industries from wastewater treatment to food processing, agriculture, pharmaceuticals,…

Dosing pump systems for chemical pumping applications
Dosing pump systems for chemical pumping applications

What is a dosing pump?

Dosing pump as the name implies, is a type of specialized equipment to pump according to a predetermined amount of refrigerant. This type of pump is often used in the food and chemical industry environment. Therefore, they are often referred to as chemical dosing pumps.

Chemical dosing pumps are designed to inject chemicals into water, gas or steam. Dosing pumps, often small, provide extremely precise flow rates for maximum control. They are the heart of an integrated dosing system designed for automated chemical dosing.

To better understand the structure, principle or application of this pump, please follow the content below to learn more!

Principle of dosing pump

Dosing pumps come in many types and each type has different operating methods. But in general, the general principle of operation of the pump is to draw a measured amount of liquid into the chamber and inject that amount of the chemical into the pipe or tank containing the liquid being dosed.

    • First: The pump starts self-priming, the device will automatically fill the pump chamber with liquid
    • Next: Once the pump chamber is full of chemical, the pump opens the check valve and draws the liquid in, then closes the valve ending the suction process.
    • After that: The liquid in the chamber is quantified, the pump will open the one-way valve and push the liquid out through the pipe.
    • Finally: As the process of controlling the dosing system, users can operate it manually or control it automatically according to their needs.
The principle of operation of the pump
The principle of operation of the pump

Structure of dosing pump

In general, the dosing pump has a not too complicated structure. They basically include parts such as:

    • Chemical chamber: Contains chemicals to be dosed
    • Foot valve: A one-way valve integrated on the suction line with the function of making the pump self-priming. Sometimes the valve is equipped with a float switch to warn of liquid related problems.
    • Pump part: There are many varieties, and vary in size and material, but the most commonly used materials are chemical resistant plastics such as (PVC, PE or similar), and rubber or stainless steel. The pump has a suction line mounted at the inlet and a metering line mounted at the suction port. Users should note that pump mechanisms are subject to change.
    • Dosing conduit: Usually quite rigid PVC or PE pipe or reinforced pipe. Occasionally in applications with steam, hot water or super high pressure, a stainless steel tube may be used. Users can add a series of pressure relief valves, air relief valves included on that pipeline.
Structure of dosing pump
Structure of dosing pump
    • Nozzle: At the place where the metered liquid is injected into the main fluid line, there is an injection point, often referred to as a check valve, so that when the pump pushes a metered amount of liquid into the pipeline. It can overcome the pressure in the distribution line and allow that liquid to enter the flow. Once the pump stops working, the check valve will now have the function of preventing liquid from being pumped into the metering pipe, to avoid the risk of damage to the pump.
    • Control system: Usually there is a control system installed directly into the pump to ensure the pump operates correctly and turns on/off at specific times. Includes pH, Chlorine metering sensors, flow controller with the function of increasing and decreasing the level of dosing.

Types of dosing pumps

There are 4 popular types of metering pumps on the market: piston pump, diaphragm pump, hydraulic pump and electronic pump. They differ in their mechanism of action and are suitable for a wide variety of applications, pressures and chemicals. Specifically:

Piston dosing pump

A type with a pump chamber operated by a piston, diaphragm and integrated valves at the inlet and outlet. When the chamber is filled with liquid. By pulling the piston, depending on the amount of liquid being dosed, the volume level of that liquid being pumped into the main flow is always at a certain flow rate.

Diaphragm dosing pump

The dosing pump head type has a diaphragm mechanism, but is controlled by an electromagnetic coil that sucks and pumps chemicals in pulses. And the time between pulses is what controls the flow rate.

Hydraulic dosing pump

There is an operating mechanism driven by a piston that functions as a hydraulic cylinder. This type of pump possesses two outstanding features: high pressure generation of piston pumps and tightness like diaphragm pumps. The pump chamber is separated in two by a flat baffle (diaphragm) of rubber or plastic.

Electronic dosing pump

This pump has two types of automatic control and manual control. The automatic control pump type has a sensor that helps the pump to give a signal to the controller when the amount of pumped chemical is not enough or exceeds the specified level.

Dosing pump accessories

Dosing pump spare parts, also known as metering pump components. Because the metering pump is divided into 4 different types. Therefore, there will be a lot of spare parts and accessories for the metering pump attached. When you need to replace or buy spare parts for this pump, you can contact Thai Khuong directly for advice and guidance on choosing the right type according to the model of the metering pump you are using. .

In addition, Thai Khuong also has service packages from installation to periodic pump maintenance at your factory, according to the technical standards proposed by the company. If you have any needs, please contact Thai Khuong!

How to install the dosing pump

Since the components of a dosing pump system are so important, how they are set up and installed is also important for all to function properly. The first thing to make sure is that all components are compatible with both the product being dosed and the refrigerant feed line. Things like high corrosive, high pressure and high temperature need specialized components for them so that no explosion, melting or corrosion occurs.

When everything is compatible, it is advisable to choose a good location for the installation. It should be noted that it should be positioned so that the product mixes well and does not affect any other parts of the pipeline, i.e. if placed in front of the valve or water meter, these parts can corrode prematurely. does not read properly or has deposits or sludge.

On the other hand, this equipment needs to be located near a power or compressed air source to make it work, generally to prevent dust collection and to be protected from the harmful effects of water, dust, sun or heat. Although dosing pumps can handle very strong corrosive products,… they are generally not very weatherproof and their housings have rather low IP ratings so they sometimes need to be protected in a cabinet. or home to maximize working life.

Dosing pump application

Dosing pump application
Dosing pump application
In addition to water treatment and food industry, pumps are also commonly referred to as chemical dosing pumps and are widely used in industrial plants, agriculture, manufacturing facilities, medical laboratories and in industrial applications. mineral mining activities. For example, a dosing pump for the food industry injects more corrosive chemicals or acids into the water tank to neutralize the pH. Or also used chlorine pumps to kill bacteria… They can also be used for other products like flocculants to make solids settle out of a liquid or change its properties.
Dosing pumps can also be used to dispense chemicals into a stream to produce product. This can be used for productions such as permanent thickening of glues or additives in the manufacture of fibreboard… High pressure and high temperature applications such as dosing of raw materials for a boiler or catalyst in processing finished products of smelter…
With the position as the largest supplier of pumping equipment in Vietnam up to the present time. TKP is confident to be able to meet your needs for all industrial pumps, especially metering pumps used in the chemical industry…
When you need advice or want to learn about the EU dosing pump line, please contact Thai Khuong immediately!

Dosing pumps

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