How Flashing Takes Place in a Control Valve

By Anonymous -
When a control valve is used for liquid flow application, a phenomenon known as flashing can occur under certain flow conditions. Just like in the process of cavitation if the liquid velocity through the valve is high enough, the pressure in the liquid may drop to a level where the fluid may start to bubble or flash. Just as in the case of Cavitation, we can model the control valve as an orifice plate and then use the changes in pressure and velocity to explain flashing. The schematic below shows the changes in fluid pressure and velocity during flashing:
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