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ONE-WAY FLOW-CONTROL VALVE MECHANISM

When fluid flows through port 1 to the left, plunger 2 is shifted axially and the fluid flows through longitudinal hole a and transverse holes b in the plunger. Upon reversal of flow, i.e. through port 3 to the right, plunger 2 is also shifted (to the right) but now transverse holes b are closed and fluid flows only through longitudinal hole a.
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