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Answer Posted / www.islamqa.com
#"Cv" for valve is known as: valve sizing coefficient or
valve flow coefficient
#It refers to " how many gallons per minute can pass
through a fully open valve under diffrential pressure of 1
PSI "
#Cv is a unitless value and by getting it's value we can
get the valve size in inch from tables.
#Cv is got from calculations using s/w provided by
manufacturer as we have many parameters affect its value,
and Cv value is critical as it affects valve size which
leads us - if wrong - to oversized valve or undersized
valve, which harm the process.
#Cv - as mentioned - is got from calculations using s/w,
but it has a basic formula for gas service and liquid
service.
#For liquid service:
Q = Cv (DP/ROH)^.5, ROH IS SPECIFIC GRAVITY
#For gas service:
Q = 963 Cv (DP(P1+P2)/ROH*T)^.5, T is gas temperature in
Rankin
Regards,
Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310
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