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Answer Posted / aftab ahmed mazari
These are flow paterns.
a. Equal percntage
b. Linear
c. Quick opening
The plug and cage is made in such a way that you can get
flow any one of above construction.
Suppose, Valve cage, plugs are Equal percentage, then at
opening of valve of 30 percent, you may get flow of only 6
to 8%
If linear, then flow also 30%,
If quick opening, then flow almost double, about 60%,
It all depends upon process requirements.
Suppose for vent valve, usually quick opening type valves
are used
aftabmazari@yahoo.com
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