... to 0.4mPa,the by-pass valve will open. ISO9001 GU-H with Check Valve Pressure Line Filter Series INTRODUCTION: ... keeping system safe.There is a by-pass valve in the filter. As the pressure drop to ... 0.4MPa, the by-pass valve will open allowing the oil flowing smoothly. When the ... accuracy is assessed by absolute filtration accuracy. Filter ratio β3, 5, 10, 20>200, filter efficiency≥99.5% ...