How is the Cv value calculated when a valve fails to stay fully open?
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Everyone, I am currently calculating for the safety valve. In one operating condition, the control valve fails to function properly. From the data provided by the manufacturer, at a maximum flow rate of 30 kg/hr, the valve opening degree is 79%, with a Cv value of 0.556. I don’t know how to calculate the Cv value when the control valve is malfunctioning and is fully open Because only by knowing the Cv value when the valve is fully open can I calculate the flow rate; please advise! ! ! Thank you
The Cv value of a control valve refers to the flow rate when the valve is fully open and the pressure difference before and after it is 0.1 MPa. The flow rate at full valve opening under the operating differential pressure can be calculated using the flow equation.
What does maximum flow mean? Can it be even higher than that?
100% full opening will definitely be greater than a flow rate of 79%