MP Filtri SFEX In-Line Suction Filter, up to 100 l/min

A suction filter that protects the pump from coarse dirt

The MP Filtri SFEX is a range of in-line suction filters that protect the pump downstream from coarse contamination. They sit below the minimum oil level, directly on the pump suction line, and handle flow rates up to 100 l/min. Female threaded connections go up to 1 1/4 inch and SAE connections up to 1 5/8 inch. Two housing sizes are listed, SFEX 060 and SFEX 110, in two lengths each.

The housing has an aluminium head and a polyamide bowl, and the element has the MYclean interface so that only matching original elements fit. Applications named by the maker are mobile machines and industrial equipment.

Technical specifications

Sizing and protecting the pump

A suction filter has very little pressure to spare: pump inlet limits are tight and any added drop reduces the pump life. The catalogue therefore sizes the complete filter at only 0.08 bar. Use coarse wire mesh (250 or 90 micron) for cold starts and high viscosity, and finer media (60 micron mesh or 10 and 25 micron paper) where the oil is thin and clean. A clogged suction element is a pump-starvation risk, so fit a vacuum gauge and watch the reading.

The bypass opens at 0.3 bar on standard versions to prevent starvation if the element blocks; the version without bypass is only for systems where unfiltered oil must never reach the pump and a vacuum switch shuts the machine down.

Keep the suction line short and airtight, because air drawn in at a joint causes noise, cavitation and early pump wear. Mount the filter below the minimum oil level so the element is always flooded, and check the vacuum gauge regularly: a rising vacuum reading is the first sign of a clogging element. The external protective wrap on the element helps the flow through the media and protects it when it is handled during servicing. Replace the element rather than cleaning paper media.

What to confirm before ordering

State the pump flow and oil viscosity at the coldest start, the connection type and size, media and rating, bypass option, seal material and the vacuum gauge or switch. The filter must stay under the minimum oil level. A related spin-on suction option is the MPS in this group, and more units are under filter housings.

Documents and quotation

The attached MP Filtri SFEX catalogue chapter (suction filters, from the MP Filtri website) lists the dimensions, flow tables by media, element data and the ordering code. Send the pump flow, connection, media and quantity for a quotation.