Microsoft Word Course Control valves R. doc

Requirements for occurrence of flashing

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Control Valves Basics - Sizing & Selection
FMD3x00 98 DB Initialize (5), configuration-and-evaluation-software-pi-9045582-en-gb, configuration-and-evaluation-software-pi-9045582-en-gb, Document, colour present

Flashing effects

Requirements for occurrence of flashing
• The fluid at the inlet must be in all-liquid condition, but some vapor must be present at the valve outlet
• The fluid at the inlet maybe in either a saturated or a subcooled condition and
• The valve outlet pressure must be either at or below the vapor pressure of the liquid.
Flashing effects
• Material damage is associated with the formation of sandblasted surfaces
• Decreased efficiency - valve ability to convert pressure drop across the valve into mass flowrate is compromised.

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