M
Hello,
I am very new to control valves. I'm still learning the basics. I cannot really understand equal percentage characteristic. I have found this explanation in control valve handbook:
"In the equal-percentage flow characteristic, equal increments of valve travel produce equal percentage changes in the existing flow".
I must admit it is hard for me to understand this. For this case, flow characteristic is quadratic (exponential) shape. How is that equal percentage. Does that sentence means that if valve is opened by 10% that flow will also increase by 10%? That shouldn't be the case.
I know that flow is proportional to a square root of differential pressure on the valve. This may have to do with quadratic shape function, but still cannot fully understand this.
Thanks
I am very new to control valves. I'm still learning the basics. I cannot really understand equal percentage characteristic. I have found this explanation in control valve handbook:
"In the equal-percentage flow characteristic, equal increments of valve travel produce equal percentage changes in the existing flow".
I must admit it is hard for me to understand this. For this case, flow characteristic is quadratic (exponential) shape. How is that equal percentage. Does that sentence means that if valve is opened by 10% that flow will also increase by 10%? That shouldn't be the case.
I know that flow is proportional to a square root of differential pressure on the valve. This may have to do with quadratic shape function, but still cannot fully understand this.
Thanks