Suction filters are used as safety filters to protect pumps from gross contamination which can cause them to grip. They are available in 3 styles : STR series immersed filters, FAS external filters, for mounting externally above the oil level SF2 external filters, for mounting semi-immersed under the oil level SF2 semi-immersed filters, which shut off oil flow while the filter element is being replaced, replace the butterfly valves usually used for servicing hydraulic pumps.
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