Specifications

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suction oil strainer filter core cartridge

This filter is located on a suction port of the pump or submerged in the reservoir and attached to the suction line leading to the strainer. The intention of a suction filter is to protect the strainer from large particles found in the reservoir. 

This filter is usually a coarse mesh filter or even a magnetic separator

 High efficiency filters are usually not placed on the suction side as high differential pressure can cause pump failure. A fine filter on a pump suction side would require the filter to be very large which will handle the flow and have an extremely low pressure drop. 

Fine filters would also have a tendency to load quicker than coarse filters

Fine filters would also have a tendency to load quicker than coarse filters which allow  the majority of small particles to pass.  Improperly sized suction filters will cause the pump to fail due to cavitation rather than contamination.  

Application 
Many pump OEMs discourage the use of suction filters and suction strainers because of the inherent risk of pump cavitation.  Proper return filtration coupled with off-line filtration and proper control of particulate ingression with high efficiency breathers can often render suction filtration unnecessary.