Cv is the flow coefficient and depends on valve size and opening. Which option best describes Cv?

Cv is the flow coefficient and depends on valve size and opening. Which option best describes Cv?

• A. Operating Pressure
• B. Valve Size and Opening
• C. Valve Material
• D. Temperature Rating

Answer: (B)

Cv is a valve’s flow coefficient, indicating how much flow will pass for a given pressure drop. It’s determined mainly by the valve’s geometry—its size and how far the valve is opened. A larger valve or a more open position increases the flow area, raising Cv, while a smaller size or a closed/smaller opening lowers Cv. Material or temperature rating affect durability and service limits, not the flow capacity described by Cv itself. This is why describing Cv as depending on valve size and opening best captures what Cv represents.

Cv is a valve’s flow coefficient, indicating how much flow will pass for a given pressure drop. It’s determined mainly by the valve’s geometry—its size and how far the valve is opened. A larger valve or a more open position increases the flow area, raising Cv, while a smaller size or a closed/smaller opening lowers Cv. Material or temperature rating affect durability and service limits, not the flow capacity described by Cv itself. This is why describing Cv as depending on valve size and opening best captures what Cv represents.