Control valve characteristic guidelines

09/01/1999



Liquid Level Control System

Control valve pressure drop

Best inherent characteristic
Constant delta pressure
Linear
Decreasing delta pressure with increasing load, delta pressure at maximum load > 20% of minimum load delta pressure.
Linear
Decreasing delta pressure with increasing load, delta pressure at maximum load & 20% of minimum load delta pressure.
Equal percentage
Increasing delta pressure with increasing load, delta pressure at maximum load & 200% of minimum load delta pressure.
Linear
Increasing delta pressure with increasing load, delta pressure at maximum load > 200% of minimum load delta pressure.
Quick opening
Source: Control Engineering with data from Fisher Controls



Flow Control Processes

Best inherent characteristic
Flow measurement signal to controller is:Location of control valve in relation to measuring element is:Wide range of flow setpointSmall range of flow but large delta pressure change at valve with increasing load
Proportional to flowIn seriesLinearEqual percentage
In bypass *LinearEqual percentage
Proportional to flow squaredIn seriesLinearEqual percentage
In bypass *Equal percentageEqual percentage
* When control valve closes, flow rate increases in measuring element.
Source: Control Engineering with data from Fisher Controls



Pressure Control System

Application

Best inherent characteristic
Liquid process
Equal percentage
Gas process, small volume, less than 10 ft (3 m) of pipe between control valve and load.
Equal percentage
Gas process, large volume [process has a receiver, distribution system, or transmission line exceeding 100 ft (30.5 m) of nominal pipe volume], decreasing delta pressure with increasing load, delta pressure at maximum load >20% of minimum load delta pressure.
Linear
Gas process, large volume, decreasing delta pressure with increasing load, delta pressure at maximum load &20% of minimum load delta pressure.
Equal percentage
Source: Control Engineering with data from Fisher Controls




Comments?
E-mail dharrold@cahners.com





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