Flashing
When liquid flowing through a valve vaporises and the downstream pressure is too low for re-condensation. Unlike cavitation, the vapour remains downstream - causing severe erosion, noise, and vibration. Requires special trim (anti-flash) and materials.
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Frequently Asked Questions
What is Flashing in the context of industrial valves?
When liquid flowing through a valve vaporises and the downstream pressure is too low for re-condensation. Unlike cavitation, the vapour remains downstream - causing severe erosion, noise, and vibration. Requires special trim (anti-flash) and materials.
How does Flashing affect valve selection and sizing?
When liquid flowing through a valve vaporises and the downstream pressure is too low for re-condensation. Valve sizing must account for this phenomenon to prevent premature failure, excess noise, and vibration. For control valves, ISA-75.01 and IEC 60534-2-1 cover sizing for incompressible and compressible flow. Vajra Industrial Solutions can assist with valve sizing calculations - contact sales@vajravyuh.com with your process data sheet.
What valve types minimise Flashing problems?
The choice of valve type and trim significantly affects susceptibility to flow-related problems. Anti-cavitation trims, low-noise cages, multi-stage pressure reduction, and proper Cv sizing reduce velocity-related damage. For critical applications, control valve sizing is performed using the ISA/IEC methodology with FL (liquid pressure recovery factor) and Fd (valve style modifier) for the specific valve geometry.
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