The separation performance of a filter element used in a hydraulic system to protect critical components can be seriously degraded by permitting fluid to by-pass the filter element. Such by-pass leakage paths stem from many different causes. For example, an element that is improperly sealed within the housing will permit a portion of the inlet flow to by-pass the filter. Damaged elements are another source of possible by-pass leakage. There is one leakage path, however, which is seldom considered in a contamination control analysis - by-pass valve leakage. Such a valve is placed in a filter housing to protect the element from excessive pressure differential and is sometimes referred to as a filter relief valve.This paper develops an analytical expression which describes the influence of leakage flow on the separation performance of a filter. Actual data associated with the flow-pressure drop characteristics of both commercially available filter elements and by-pass valves are utilized to illustrate the leakage flow relative to such valves. Graphical illustrations are used to demonstrate the performance deterioration due to by-pass valve leakage.


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    Title :

    The Effect of By-Pass Valve Leakage on Filter Performance


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1975 SAE International Off-Highway and Powerplant Congress and Exposition ; 1975



    Publication date :

    1975-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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