Argo Hytos HD 417 & HD 617 pressure filters are ideal for high pressure hydraulic circuits with changing flow direction. The "Graetz" system integrated into the head piece ensures the filtration of the hydraulic fluid in both directions. These filters protect against system wear using filter elements that meet the highest cleanliness demands, even in full-flow applications. The specific determined flow rate guarantees a closed by-pass valve even at ν ≤ 200 mm2/s / 927 SUS (cold start condition). Filter elements have flow direction from the outside to center. The star-shaped pleating of the filter material results in large filter surfaces, low pressure drop, high dirt holding capacities, and long service life. Clogging indicators optional.