Operation of the metering and dosing pump. Any positive displacement pump can be used as a metering or dosing pump. The aim of these pumps is to inject a known amount of liquid into the process flow. The primary condition is that the pump continuously delivers the same volume of liquid over a given period of time. Keyword: gear pump, piston pump, helical rotor pump, diaphragm pump, peristaltic pump, additive, dosing rate.

Types of Metering and Dosing Pumps

Positive displacement pumps used for dosing purposes include diaphragm pumps, peristaltic (hose) pumps, helical rotor pumps, gear pumps and piston pumps. Piston pumps are the form generally referred to as metering or dosing pumps. The precision of the supplied quantity is poor with the diaphragm pumps, better with the hose pumps, good with the rotor pumps, outstanding with the gear pumps and the best with the piston pumps. The cost of each type of pump increases in the same order.

Pumps in the lower order of the list incur losses due to back pressure performance. When operating against high pressure, any of the liquid in the pipe does not necessarily get expelled from the pump. The higher the pressure, the less liquid it is expelled. This is precisely the opposite of what is expected of a metering pump. Yet low-pressure, low-precision systems are cost effective.

Helical rotor and gear pumps work well when dosing is needed for longer periods of time. Piston pumps are the most reliable metering pumps. Small chambers in the pump are pressed empty by a manually or hydraulically moved rigid piston. The length of stroke and/or the duration of stroke are adjustable.

Accurate dosing results in less wasting of costly ingredients which results in reduced prices when only the same quantity is used.

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