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PISTON-TYPE PUMPS (STRATOPOWER VARIABLE DISPLACEMENT)
Fluid flow

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 7-16.—Internal features of the Stratopower pump. Figure 7-17.—Mechanical drive. Figure 7-18.—Fluid displacement. bore, pressure opens the check spring and a quantity of fluid is forced past. Combined back pressure and check spring pressure closes the check spring when piston bypass ports align with the cylinder block bypass passage. The partial vacuum occurring in the cylinder during the piston return causes reservoir fluid to flow from the intake loading groove into the cylinder. Pressure Control.—A schematic diagram of the pressure control mechanism is shown in figure 7-19. Pressure is bled through the control orifice into the Figure 7-19.—Pressure control mechanism. 7-17







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