![]() Variable Backpressure by definition is difficult to calculate, but may be compensated for easily by installing a bellows in the PRV which isolates the backside of the PRV Disc from the effects of backpressure and thereby eliminates the variability of the set pressure and the need for a CDTP calculation. ![]() The constant superimposed backpressure is subtracted from the Set Pressure and the PRV is tested at a lower pressure and the Cold Differential Test Pressure (CDTP) plus the Constant Backpressure will result in a PRV which opens at the required Set Pressure in the System. ![]() If it is constant, a Cold Differential Test Pressure may be applied to the Set Pressure of the PRV. Superimposed Backpressure may be variable or constant. Superimposed Backpressure is present at the outlet of the PRV prior to the PRV Lifting and is a result of another source.
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