the filters you see on pumps is pressure side filter and generally do poorly in terms of efficiency. Beta is the typical term used for filter efficiency. A beta of 2 means that the filter is only catching half the particles of a given size. Pressure side filters with cellulose media typically have a beta of 3-4. If they would have put the filter on the suction side it's have a beta of at least 10 but very typically closer to 100 or even maybe 500. Dirty filters are more efficient but at the expense of pressure drop which is where your mileage drops are coming from. Hydraulic systems have filters typically downstream of all the pumps/valves, actuators and on the return to tank side.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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