Answer Posted / www.islamqa.com

x-axis is %valve stroke
y-axis is %flow rate

we have 3 versatile characteristics:
====================================
linear: flow rate is linearly proportional with valve stroke
equal percentage: flow rate increases slowly with valve
stroke
quick opening: flow rate is increasing dramatically with
small valve stroke


Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
CELL.: 00 2 0121367310

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