Control valve Flow characteristic. How the equal percentege
curve form?
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Answer Posted / k.surya mutyalaro
each increment in valve lift increases the flowrate by a
certain percentage of the previous flow. The relationship
between valve lift and orifice size (and therefore flowrate)
is not linear
but it is depends on Valve rangeability (ratio of the
maximum to minimum controllable flowrate)
v(h)=((e power x)/t) * Vmax
V(h)=
Volumetric flow through the valve at lift H.
x
=
(ln t) H Note: 'In' is a mathematical function known as
'natural logarithm'.
t
=
Valve rangeability
H
=
Valve lift (0 = closed, 1 = fully open)
max
=
Maximum volumetric flow through the valve
it is very important that the Valve rangeability defers
from the valve to valve.
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