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Comment PDF Operations & Maintenance

Control Valve Selection: True Cost Savings Are Available

By Vesa Lempinen, Metso Automation, Inc. |

New safety and environmental regulations, longer plant uptime and changes in maintenance practices have created new requirements across the chemical process industries (CPI). Among the plant equipment affected by these changes are control valves, since they are used in numerous applications in a variety of process conditions. Figures 1 and 2 show typical control valves installed in CPI plants. The primary function of a control valve and its associated control loop are to respond to process and setpoint changes as quickly and accurately as possible, in order to provide sound process control as desired and to avoid disturbances. The selected control valve must provide reliable, safe and robust operation under all process-load conditions, as well as withstand the flow medium, including any possible damaging or hazardous impurities that might be present.  Figure 1. Control valves are vital in a variety of industrial applications. Proper design and sizing lead to proper selection, and, ultimately, optimal installation and performance   FIGURE 2. Correct control-valve selection enables seamless process operation, even in demanding process…
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