Worksheet GL-a2
by M. Fraganza and M. Miccio based on the Examination test of January 28, 2016
rev. 1.1 of 03.04.2019

Objective

• Selection and sizing of a globe control valve using the inherent characteristic data provided by the manufacturer in the form of a table.

Go

to data input

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Data provided by the manufacturer

Fisher PF51.2:HP globe valve - Intrinsic linear characteristic

Valve opening

Valve size

(inches)

NB: The intrinsic characteristic is actually LINEAR only in the central section

Data provided by the manufacturer

Fisher PF51.2:HP globe valve - Equal percentage intrinsic characteristic

Valve opening

Valve size

(inches)

NB: The actual intrinsic characteristic is not exactly exponential

Data input for the liquid:

NB:

The data pre-entered in the fields are those of the examination problem of January 28, 2016

Select the liquid

specific density

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Input upstream pressure P₁

Input downstream pressure P₂

input vapor pressure P_v

input mass flow rate

Data input for the valve:

input the nominal diameter (inch) of the valve

Select the intrinsic characteristic

Verification of the choice by comparing the C_v to 70% of the stroke

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Nominal diameter (inch) chosen for the valve:

"

Application of the 70% rule to the chosen valve:

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