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Dosing

Flow-rate control in an industrial automatic washing system



Task

An industrial automatic washing system must be filled with a preset quantity of wash water. In addition to the wash water, it is necessary to provide rinse water at a constant volume flow.

Solution

The washing drum of an industrial automatic wash system is embedded in several washing chambers and transports the linen to be washed from chamber to chamber by rotation. A preset wash water stream is added to the first chamber via an angleseat valve. The wash water is supplied from a supply tank whose fluid level is monitored by means of an ultrasonic level transmitter. The quantity of water flowing is detected by means of a magnetic inductive flow transmitter. Rinse water is added in reverse flow to the direction of the wash water via the last chambers. A partial stream is supplied uncontrolled via a globe valve. The second partial stream of rinse water is controlled via a globe control valve so that the total stream pumped from a supply tank and required by the wash process is achieved. The controlled partial stream and total stream of water are measured via magnetic inductive flow transmitters. The overflowing water from an overflow tank is admixed to the rinse water via a globe valve, thus achieving a closed rinse circuit.