The purpose of the test is to plot a characteristic curve of the valve. This curve shows the dependence of the volume of liquid passed by the valve per minute on the pressure in the delivery pipeline. In the test, liquid drawn up by pump 1 from tank 2 passes through relief valve 3 and flow-control valve 4, connected in parallel. When flow-control valve 4 is closed, all the liquid is discharged to the tank through relief valve 3. If valve 4 is partly opened, part of the liquid passes through it and the rest through relief valve 3. The pressure of the liquid is measured by pressure gauge 5.
$3722$SHP,M$