UNLOADING VALVE MECHANISM WITH A LOCKING MEMBER

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When the pressure in the system exceeds a preset value, controlled by the force exerted by helical spring 2, piston 1 is lifted, compressing spring 2. This disengages wedge-shaped pin a from piston 3, connecting the system to the tank so that its pressure drops. Piston 3 is returned to its initial position by depressing knob b.
$3620$SHP,Va$

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Documents: Hydraulic, pneumatic and electric mechanisms  [Streambook]
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