IV 1.4.1. Purpose of the unit
The unit is used for dosing of water treatment chemicals in mobile drinking water
purifiers. Installation can be carried out preceding or after a Berkefeld precoat filter
plant by coupling the unit with the connections between 2 hoses. Dosing is carried
out continuously into the treated pure water.
IV 1.4.2. Operation method
The dosator operates according to the back pressure displacement process, i.e. a
firmly installed jam screen is installed between two connections in the main water
flow, by which different pressure ratios arise in the two by-pass connections (∆ p).
∆ p
_____é ___________ê __
P 1 P 2
____________ ____________
By this the required quantity of water is supplied to the displacement tank via the
motive water pipe with flow meter and adjusting valve. The same quantity of
chemical solution is displaced and pressed into the main water flow. The adjustment
of the chemical quantity to be added is carried out by an adjusting valve at the flow
rate meter. The chemical solution is in a bag, which is housed in the displacement
tank and which fills it out completely.
Annex 5 shows the dosing unit. It consists of the following parts:
01 Dosing tank (displacement tank)
02 Displacement bag
03 Filling and dosing connection
04 Main connections (retarding disc pipe)
05 Flow meter with adjusting valve
06 De-aerator
07 Drain
including the required connection pipes.
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