These Edwards internal oil filter gaskets are needed when replacing the internal oil filter on the E1M175, E2M175, E1M275, and E2M275 model rotary vane pumps. These large rotary vane pumps have an internal oil filter screen device that filters the vacuum pump oil before it goes in to the oil pumping section of the vacuum pump. It is important that the internal oil pump receive clean oil. The internal oil pump pressurizes and provides oil pressure to cool and seal the internal moving parts of the vacuum pump, which are critical to pumps life and good vacuum performance.
These internal oil filters are used in large Edwards E1M175, E2M175, E1M275, and E2M275 rotary vane vacuum pumps to pre-filter the vacuum pump oil before it enters the pumps internal oil hydraulic pump. Changing these filters is and important part of your preventive maintenance interval. If these filters get clogged up the pump could loose vital cooling lubricant flow. There is an external pressure gauge that signals when the differential pressure across the filter is too high "signals when this filter should be replaced".