What is the concept of the permanent pressure loss of a control valve?
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As the title suggests, what is the concept of the permanent pressure loss of a control valve? What is it related to? What is the approximate impact of valve type, diameter, and opening degree on this? Because I’ve seen that for some control valves, the required pressure difference before and after the valve is very small, such as 0.005; this pressure difference seems even smaller than the valve’s permanent pressure loss. That’s why I’m seeking advice from everyone!
What is the unit of 0.0005? If it’s Kpa, then I don’t think the fluid can be controlled. If it’s in Mpa, then that’s equivalent to 5 kPa, which is still okay. P1=5Kpag, P2 is at a slight positive pressure; flow control in open-type burners is similar to this application. The selection is perfectly fine.