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<span style="font-size: 8pt;">The PREVO is a Volume Pressure Regulator (CPV in French) used for measuring ground geomechanical properties according to the cylindrical cavity expansion principle. </span><span style="font-size: 8pt;">Powered by a compressed air cylinder and the auger machine’s battery, the PREVO servo valves automatically adjust test pressure levels. The stress applied (on and between the main bearings) is perfectly controlled by the PREVO operating as a closed loop.</span> <span style="font-size: 8pt;">Stress maintenance is perfectly controlled, independently of the reaction of the ground being stressed. The stressing procedure (plateau, duration) is controlled by the operator or automatically by the BAP160 (or the LUBAP) connected to the PREVO (e.g. according to the stipulations of the NF P 94-110 / EN ISO 22476-4 standard). </span><span style="font-size: 8pt;">In this configuration, controlled by the BAP160 or the LUBAP, the PREVO performs the test according to the programmed procedure in automatic or manual mode as selected by the operator. The pressure, volume and time measurements recorded are exploited on a PC by the software EXPRS.</span> [button link="https://www.youtube.com/watch?v=wb7arp7zgRo" type="big" color="lightblue" newwindow="yes"] Watch Video[/button]