Return Line Filters

Return line filters usually have spin-on type elements, cartridge elements in an in-line mounted housing, or cartridge elements within a housing that is mounted directly within the reservoir itself (sometimes referred to as an in-tank filter).

Return line filters may also be equipped with fluid sampling devices to monitor the fluid cleanliness level. Secondary ports may also be incorporated to add make-up fluid and ensure that the fluid is transferred through a filter before entering the system.

Return line filters are:

• An integral part of an effective contamination control solution.
• Ideal for systems where the pump is the sensitive component.
• An economic means of achieving the target cleanliness level.
• Often placed before the fluid enters the reservoir in order to prevent debris and particle recirculation through the system.
• A crucial component when cylinders are present in the system. Cylinders potentially contribute a large amount of contamination ingression and return line filters are ideal for this type of control solution.
• Sometimes the only filters necessary (combined with a breather) when seeing the entire system flow on a continuous basis.
• Only a part of an effective contamination control solution when the system employs variable displacement pumps. Filters in systems like this may be supplemented by pressure and/or off-line filters.