DETERMINATION OF THE FLOW RATE THROUGH LONG RADIAL CLEARANCES INSIDE HYDRAULIC COMPONENTS

In hydraulic control components (directional control valves, servo valves, LS regulators, etc.) there is a problem of determining of flow rate through the radial clearances of different lengths overlap between the control piston and body of component. As lengths of overlap are relatively small, it is necessary to analyze the development of a full profile of fluid velocity through radial clearance (in sleep mode servo valve has length of overlap equal zero; directional control valves, depending on the diameter, have lengths of overlaps of 0.6 to 0.8 mm; while in work of the load sensing (LS) regulator, piston is continuously located in areas of small opening, zero overlap and small length of overlap). Common values of radial clearance is approximate in the range from 1

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