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CAM-OPERATED UNLOADING VALVE MECHANISM

The valve is connected to the high-pressure main by connection 1. When it is necessary to reduce the pressure in the main, head a is depressed, overcoming the resistance of helical springs 6 and 5 and pushing rod 2 and ball 3 to the right. This connects the high-pressure main to a relief valve. The latter is connected to port 4.
$3614$SHP,Va$