The location where a filter is located in a hydraulic circuit affects the protection it provides as well as how it operates and the way in which the system functions. Suction filters guard the pump but limit flow if they are oversized incorrectly, and pressure-line filters protect downstream components such as servo valves but have to handle all system pressures, and return-line filters filter out the contaminants created by the system before it is recirculated. The location of the filter is not interchangeable; each location affects the protection level and flow restriction, pressure drop, and the life of components in a distinct way, making the wrong choice could cause performance degradation in the background before it leads to a complete failure.
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