Vacuum Filters
for Low Coolant Entry and Oil Filtration Applications
Polytech SL and SLE Series Automatic Vacuum Filters

Polytech's patented low entry vacuum filters are designed to operate effectively with heavily aerated fluids. A low coolant entry height ( as little as 10" ) or the use of heavily aerated grinding and cutting oils is no problem at all. Coolant can drain directly from the grinder or machine tool into the filter section. The use of transfer pumps and tanks and problems associated with clumpy, stringy or fibrous contaminants is eliminated.

These filters turn conventional vacuum filter design upside down. Dirty coolant is quickly filtered and transferred to the upper clean tank where there is time and space to manage entrained air in the fluid before separate, dedicated clean coolant supply pump(s) return coolant to the machine tool which eliminates the possibility of pump cavitation and loss of coolant flow.

They automatically adjust to operating conditions to provide the highest possible differential pressure and provide differential pressures at least 30% greater than conventional vacuum filters for good filtration performance and longer media life on both water and oil based coolants.

The SL series are very compact to conserve plant space. The SLE series provide higher discharges to allow the use of large swarf hoppers. Both designs can provide great flexibility for solving difficult packaging problems.