Application Notes
KV coefficient Valve sizing
Calculation of the valve flow coefficient KVThe procedure
specified in the IEC 60534 standard is applied todetermine the
valve flow coefficient KV. The relevant device-spe-cific data can
be found in the associated data sheets.The equations below are
given to allow a preliminary, simpli-fied calculation of the valve
flow coefficient to be performed.Please note that these equations
do not take account of the influ-ence of the connection fittings
and the flow limitation in case ofcritical flow velocities.
Selection of the valve flow coefficient KVSOn the basis of the
calculated valve flow coefficient KV, the ap-propriate valve flow
coefficient KVS for the relevant valve typecan be selected from the
associated data sheet.If realistic operating values have been used
for the calculation,the following applies in general: For
self-operated regulators: KVmax = 0.75 KVS For motor-operated
valves: KVmax = 0.9 KVS
Edition March 2012
Application Notes AB 05 EN
p1 Upstream pressurep2 Downstream pressureH Travel
V.
Volume flow rate in m/h (gases)W Mass flow rate in kg/h
(liquids, steam) Density in kg/m
(general, also in liquids)1 Density upstream of the valve in
kg/m
(in gases and vapors)1 Temperature in C upstream of the
valve
Medium Liquids Gases Steam
Pressure drop m/h kg/h m/h kg/h kg/h
p2 >p2
1
KV = V.
1000 pKV =
W
1000 p
KV =V.
G
519
G Tp p2
1 KV =W
519Tp p1
G 2 KV =
W3162.
vp2
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