Diaphragm Metering Pump Technology Explained - Dosatron

What is a Metering Pump?

A metering pump is used to add small but accurate volumes (doses) of a liquid or powder concentrate to other fluid streams such as water drinking tanks or vessels. Metering pumps are also called dosing pumps and proportioning pumps. A metering pump must be able to deliver liquid with an accuracy of greater than 3% across a wide range of discharge pressures.

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What is a Diaphragm Metering Pump?

A diaphragm metering pump is a positive displacement pump designed to operate as a proportional dosing pump. It uses a flexible diaphragm in place of a piston to change the volume of the pump’s chamber to increase and decrease pressure on the fluid inside.

How does a Diaphragm Metering Pump Work?

A diaphragm metering pump works just like a piston pump. The water drives the diaphragm up and down. The plunger is fixed to the diaphragm, which pumps the product into the main water flow. At the output, the volume of a dosed product is proportional to the driving water volume.

Where and Why are Diaphragm Metering Pump Used?

Metering pumps are required in many industries, including water treatment, chemical processing, and animal health applications. The concentrate can be anything from fertilizers, water treatment additives, and medicines.The main application for a diaphragm metering pump is the treatment of drinking water in the avian sector. It is also used for accurate dosing of, for example, fertilizer and medicine in small farming businesses.A diaphragm moves up and down without friction and without internal leakage. This allows the pump to start at a very low flow and pressure, even if using a tap, borehole or surface water.

Diaphragm Metering Pump Installation Hints

The Diaphragm Metering Pump can be connected to the main water line directly or on a by-pass. To prolong the working life of the pump, it is advisable to install a filter, (for example, 300 mesh - 60 microns depending on your water quality) upstream. This is imperative if the water contains impurities or particles, especially if the water comes from a well.

A filter is recommended and required for the warranty to be valid.

IMPORTANT

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Do not put the suction tube strainer on the bottom of the stock solution container. The strainer must be suspended at least 10 cm [4”] above the bottom of the tank to avoid sucking up the insoluble particles that may damage the injection assembly. Do not put the strainer on the ground.

Installation for Operation Using Gravity

To power and operate the pump using the pressure that gravity imposes on fluids, follow these recommendations.

According to the required installation type and water flow, provide at least 1.5 meters for the hydraulic head. Take into account pressure loss from the components of the installation such as filter, hose lengths, check-valves, etc.

Diaphragm Metering Pump Maintenance

When using soluble products to be dissolved, it is recommended to regularly disassemble the entire dosing part.

If it is difficult to reassemble, rinse all parts of the dosing part carefully with water and refit them after greasing the seal with a silicone lubricant.

Before putting the diaphragm metering pump into service after a period of non-use, remove the piston and seal assembly and soak it in warm water < 40° C [104° F] for a few minutes. This will dissolve any deposits.

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