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Key Considerations in Specifying Control Valves

By Satyendra Kumar Singh |

Follow this guidance to specify a control valve accurately during the design phase   Control valves are one of the most common and important instruments used in the chemical process industries (CPI). They help to ensure smooth and efficient operation of process plants, by achieving the desired operating parameters by means of regulating the fluid flow in connected pipes. The need to properly specify control valves during the design phase of a plant cannot be overemphasized. The size of a control valve is derived from a parameter called the flow coefficient ( C v), which is defined as volumetric flowrate (in gal/min) of water through the valve at 60°F when pressure drop across the valve is 1 psi ( C v is calculated using the formula given in the standard ISA-75.01.01-2007). Process engineers should take the following aspects into consideration when specifying control valves, to ensure that the valves that are manufactured by the vendors function according to the requirements. 1. Controllability. While specifying a control valve during the design phase, the process engineer should ensure that the valve’s controllability must be good over the entire range between minimum and maximum flowrates. This can be done by estimating the…
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