The oil mist filter is mounted on the exhaust port of rotary vane pumps. It filters oil mist particles from the conveyed gas flow and thus reduces the escape of operating fluid mist.
The filter elements are installed in a corrosion-resistant aluminum casing and consist of a cylindrical filter made from glass/polyester fleece in the standard and helium-tight versions, or from sintered carbon in the corrosive gas version. A baffle is also fitted over the filter insert. An integrated pressure relief valve opens when the filter elements are excessively contaminated. The volume of filtered operating fluid can be viewed through a sight glass and drained via a drain screw.
To return the filtered operating fluid from the ONF into the pump without interrupting the pump operation, an operating fluid return (optional) can be used.