I may be wrong, but a filter would require changing the relief valve setting since the upstream process piping would experience a pressure greater that the piping between the filter and the PRV i.e. a filter adds a pressure drop before the PRV.
An existing pressure relief valve (ASME) is presently used on a dirty water system. Occassionally the valve lifts (or weeps) as expected (from thermal expansion) but leaves residual crud in the valve seating area and discharge piping. A suggestion was made to place an inline filter in front of...
