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PILOT-OPERATED SPOOL-TYPE DIRECTIONAL VAVLE MECHANISM

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When fluid under pressure is delivered from the pilot valve to the right end chamber of the directional valve, spool 1 of the valve is shifted to the left, shutting off fluid delivery through port e to the power cylinder. Owing to overlap a, the machine tool table dwells in its extreme position. As the fluid flows out of the left end chamber b of the directional valve, it passes through flow-control valve 2. This slowly increases the amount of fluid delivered to the power cylinder through port d and, as a result, the speed of the table accelerates smoothly in the return stroke.
$3663$SHP,FC$

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Documents: Hydraulic, pneumatic and electric mechanisms  [Streambook]
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