LES DRISKELL CONTROL VALVE SIZING PDF

If you have an automation-related question for this column, write to liptakbela aol. Q: I am an engineer working in operation and maintenance of test facilities in the Indian Space Research Organization. I have a requirement for a new control valve to be installed in our facilities. I am selecting equal percentage characteristics for the control valve, but I need to specify the rangeability for the control valve.

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If you have an automation-related question for this column, write to liptakbela aol. Q: I am an engineer working in operation and maintenance of test facilities in the Indian Space Research Organization. I have a requirement for a new control valve to be installed in our facilities.

I am selecting equal percentage characteristics for the control valve, but I need to specify the rangeability for the control valve. For this, I have calculated the ratio of required max Cv to min Cv 10 for the particular case , and I have selected the valve rangeability , which is higher than this ratio. Kindly correct me if my method is wrong. I would be highly obliged if you can guide me on this point.

Jai Vishnu K. The left side of Figure 2 shows the relationship between percentage of valve stroke and percentage of flow Cv of three valve characteristics on a linear scale, while the right side shows the same on a logarithmic scale. Therefore, the valve rangeability is See Chapter 6. Please find basic rules for selecting control valve on rangeability aspect. From process flow minimum and maximum ratio perspective, no control valve can handle a rangeability of more than There could be specially manufactured characteristic trim which can improve rangeability further.

When a process requires a rangeability of , you need also be careful to select the right flowmeter because no single flowmeter element, except an ultrasonic meter, can give you such high rangeability. From a control valve sizing perspective, you need to satisfy the requirements of controllability. When one control valve does not meet your flow rangeability requirement, two control valves or more should be considered in parallel. To achieve high rangeability you can use two different trims in the same body.

First trim can serve minimum to normal flow range; the second one can be used when the flow is normal to max. Or this ratio can be adjusted according to the available standard trim ranges.

D Guha.

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