40 (Piston Diameter): This indicates the unit has 40mm diameter plungers.
AD (Liquid End Design): This stands for the “Aseptic Design” or a specific “Actuated” valve configuration, common in Rannie “Hyper” models designed for higher pressures.
50 (Stroke Length): This refers to a 50mm piston stroke.
355 (Max Pressure): This is the crucial number—the machine is rated for a maximum operating pressure of 355 bar (approx. 5,150 psi).
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