How did the Control valve nameplate read? | Leakage Class, Cv, Rating ASME rating in Hindi 

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Modern processing plants utilize a vast
network of control loops to produce an
end product for market. These control
loops are designed to keep a process
variable (i.e. pressure, flow, level,
temperature, etc.) within a required
operating range to ensure a quality end
product is produced. Each of these loops
receives and internally creates
disturbances that detrimentally affect
the process variable (PV). Interaction
from other loops in the network also
provide disturbances that influence the
process variable
To reduce the effect of these load
disturbances, sensors and transmitters
collect information about the process
variable (PV) and its relationship to some
desired set point. A controller processes
this information and decides what must
be done to get the process variable back
to where it should be after a load
disturbance occurs. When all the
measuring, comparing, and calculating
are done, some type of final control
element must implement the strategy
selected by the controller.
The most common final control element
in the process control industries is the
control valve. The control valve
manipulates a flowing fluid, such as gas,
steam, water, or chemical compounds to
compensate for the load disturbance and
keep the regulated process variable as
close as possible to the desired set point.