Control Valves

Best Practices for Steam Control Valve Installation

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Step 10: Valve Turndown Requirements

Understanding the control valve turn down capabilities is very important. When sizing a control valve, always size on maximum flow. The minimum flow will be a frequent control point as compared to operation at the high flow rate. Therefore, the steam control valve must be able to operate successfully at the low flow rates. It is more important to properly select the valve at low flow operating conditions that at its assumed high flow operating conditions. Often, there are times when more than one control valve is needed to meet the performance of the process application:

  • 20 to 1 Regulator
  • 30 to 1 Globe Valve
  • 40 to 1 Cage Control Valve