Worksheet No. 4

by G. Miglino, M. Fraganza and M. Miccio based on the Examination test of 12.11.03

rev. 2.1 of April 3, 2019



Objectives

Choice of the intrinsic characteristic suitable for a given characteristic installed.The valve is installed in a circuit whose user pressure drop is Pu.


 The authority of valve V is the parameter that will motivate the choice.Calculation of the transit flow rate for a given stroke value once the intrinsic characteristic has been chosen.

Data input for the liquid:

relative density of the liquid input:
atm
Pa
psi

Pu across the user equipment input:

Pn (nominal) across the valve input:

Data input for the control valve:

Nominal flow coefficient Cvn () input:

Rangeability input:

Graphs of the characteristic curves:

Intrinsic characteristic:

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Installed characteristic:

Calculation of the transit flow rate for a stroke value set "as desired":

The relative stroke h for which to calculate the flow rate input:

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