Answer Posted / imran
•Linear - flow capacity increases linearly with valve
travel.
•Equal percentage - flow capacity increases exponentially
with valve trim travel. Equal increments of valve travel
produce equal percentage changes in the existing Cv.
•A modified parabolic characteristic is approximately
midway between linear and equal-percentage characteristics.
It provides fine throttling at low flow capacity and
approximately linear characteristics at higher flow
capacity.
•Quick opening provides large changes in flow for very
small changes in lift. It usually has too high a valve gain
for use in modulating control. So it is limited to on-off
service, such as sequential operation in either batch or
semi-continuous processes.
•Hyperbolic
•Square Root
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