The Pressure Recovery Factor
The pressure recovery factor is a parameter used to calculate the maximum possible flow through a valve for a given valve opening and upstream pressure. It refers only to liquid flows, and the flow phenomena that is associated with the maximum flow is choking cavitation. The paper presents a plot of F//l versus the flow coefficient C//v for different types and sizes of valves. Test data for the valve sizes of 2 to 36 inches are included for the pressure recovery factor, F//l. The plot can be used to estimate F//l for most common types of valves, and as an aid in designing and operating control systems.
The Pressure Recovery Factor, Instrument Society of America, Research Triangle Park, North Carolina, proceedings of the April 1985 New Orleans International Symposium, (Rahmeyer and Rau).