Tell-tale Hydraulic filters

This is a versatile filter, which can be directly welded into a reservoir’s suction and return line or conversely installed in pipes with a maximum pressure of 10 kg/cm2 (142 psi). This filter can remove particles as small as 3 u. It consists of an indicating element, which indicates the time when cleaning is required. That is why this filter is referred to as a telltale filter (Figure 7.8).


The operation of a tell-tale filter is dependent on the fluid passing through the porous media, which traps the contaminants. The tell-tale indicator monitors the pressure differential buildup due to dirt, which gives an indication of the condition of the filter element.

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