Process and apparatus for controlling the regeneration of water softening units

摘要

The process and the apparatus for controlling the regeneration of water softening units exploit the properties of the exchanger material of undergoing a decrease in volume during the softening of water and an increase in volume during the regeneration. The regeneration is initiated when the exchanger material (36) which is in a container (10) on which a bellows (24) is attached, assumes a small volume. Via an actuating stem (30), a regeneration valve is actuated, via which regeneration brine is passed through the exchanger material (36). When the material (36) increases in volume during the regeneration, the bellows (24) expands and the regeneration valve is shut off via the stem (30), after which further water softening can be carried out.