Suction filter for liquids
20 - 600 gpm Polytech

Polytech's conventional vacuum filters provide reliable automatic filtration of water based machine tool coolants and are suitable for coarse or fine solid contaminants and coolant flow rates from 20 to over 600 gallons per minute. Conventional vacuum filters utilize the difference in pressure between the dirty coolant tank at atmospheric pressure and the lower pressure created by the centrifugal pump's suction characteristics to force coolant through a non-woven filter fabric. The filter pump supplies clean, filtered coolant to service. These systems use a robust sludge conveyor to transport spent filter media and solid contaminants from the filter while a clean coolant reservoir provides a means of supplying coolant while the filter media indexes so that there is no interruption in coolant supply to the machine tool(s).

Conventional vacuum filters can typically provide 5 PSI differential pressure across the filter media so that coolant flow rates and contaminant loading per square foot far exceeds the capability of gravity type filters. The non-pressurized design is more reliable than pressure filters that require complex media handling and sealing arrangements. The automatic, unattended operation is much easier and less labor intensive than cartridge or bag filters that require manual filter changes.