Numerous methods have been developed to selectively remove water and other volatile contaminants from hydraulic and lubricating fluids. These methods include absorbent filter media and regenerable adsorbent packings and the like. In many cases, it is not economical or practical to use disposable media, and as a result, continuous scrubbing processes have been developed. These processes are available in a variety of designs and are universally referred to as oil reclamation systems.

The most common scrubbers are derivatives of vacuum distillation processes used in refineries. The process involves expanding oil to produce high surface area to facilitate the vaporous extraction of water and certain other contaminants.

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Filtration has two primary objectives. The first objective is “protective”. This refers to creating a barrier to protect particle-sensitive machine components from the invasion of contaminants capable of causing sudden-death machine failure. Machines that have high mission criticality from the standpoint of safety, lost production and/or repair cost are good candidates for protective filtration. Such filters are located just upstream of sensitive components. Many components don’t require wear in order to fail, but they can experience critical loss of performance due to motion impediment and/or flow blockage caused by the intrusion of particles of a particular size and composition. Servo-controlled electro-hydraulic valves are examples of such components that benefit from protective filtration.

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