DOSING SYSTEM FOR DOSING OF A LIQUID ADDITIVE INTO A PRESSURIZED WATER SUPPLY LINE

摘要

This invention relates to a dosing system for dosing of a liquid additive into a pressurized water supply line, comprising: a water tap connector (3), a liquid ad­ ditive connector (5), a product discharge connector (7), a water supply line (8) leading from the tap connector (3) to a junction point (9) with a backflow pre­ venter (10) therein, an additive supply line (11) leading from the additive con­ nector (5) to the junction point (9), a product discharge line (12) leading from the junction point (9) to the product discharge connector (7), and at least one control element (13) positioned to control, in operation of the system, the flow of water and/or liquid additive. The improved system comprises a motorized positive­ displacement forcing pump (18) positioned within the additive supply line (11) upstream of the junction point (9) and an additive-flow meter (19) positioned within the additive supply line (11) preferably downstream of the pump (18) a water-flow meter (24) positioned within the water supply line (8) preferably up­ stream of the backflow preventer (10) and an electronic control unit (25). The flow meters (19, 24) and the pump (18) and preferably at least one control ele­ ment (13) are connected to the control unit (25). In operation of the system the control unit (25) controls the flow rate of the additive to the amount required by the flow rate of water by controlling the operation of the pump (18), in particular the operating speed of the pump (18).