opposite side), point c, and point d (opposite pointc). This action will show whether the couplingfaces are parallel to each other. If they are notparallel to each other, adjust the driving unit orthe pump with shims until the couplings checktrue. While measuring the distances, you mustkeep the outside diameters of the coupling flangesin line. To do this, place the scale across the twoflanges, as shown in figure 9-16, view C. If theflanges do not line up, raise or lower one of theunits with shims, or shift them sideways.The procedure for using a thickness gauge tocheck alignments is similar to that for a scale.When the outside diameters of the couplingflanges are not the same, use a scale on thesurface of the larger flange, and then use athickness gauge between the surface of the smallerflange and the edge of the scale. When the spaceis narrow, check the distance between the couplingflanges with a thickness gauge, as shown in figure9-16, view D. Check wider spaces with a piece ofsquare key stock and a thickness gauge.CONSTANT-PRESSUREPUMP GOVERNORSA governor is a feedback device that is usedto provide automatic control of speed, pressure,or temperature. A constant-pressure pumpFigure 9-17.—Constant-pressure pump governor.9-12
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