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MACHINE TOOL HYDRAULIC DRIVE MECHANISM WITH A SPEED REGULATOR

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Pump 1 delivers fluid to the left end of power cylinder 2, moving piston 3 to the right. Relief valve 8 maintains constant pressure in the system. Fluid from the right end of cylinder 2 is discharged to chamber a of the pressure reducing valve and from the chamber through opening d, formed between member 4 and the hole of bushing 7, into chamber b with reduced pressure. From here the fluid passes through flow-control valve 5 to the tank. The action of spring 6 on the valve member is counterbalanced by the pressure in chamber b. If the pressure increases in the right end of cylinder 2, the reduced pressure also increases and valve member 4 moves upward, reducing opening d. This reduces the flow of fluid to chamber b and, consequently, the pressure in the chamber. When the pressure drops in the right end of cylinder 2, valve member 4 moves downward, increasing the flow to chamber b and the pressure in it. Thus, constant pressure is maintained before flow-control valve 5, providing for constant speed of piston 3 at each setting of valve 5. This arrangement, consisting of a pressure reducing valve and a flow-control valve, serves as a speed regulator.
$4184$CHP,Dr$

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Documents: Hydraulic, pneumatic and electric mechanisms  [Streambook]
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