Understanding Why Cavitation and Flashing are Bad for Control Valves and Pumps

Cavitation in process control valves results from a rapid drop in pressure as liquid passes through the valve. The condition results in the formation of vapor spaces or bubbles within the valve cavity. When the bubbles move downstream into a larger cross-sectional area, velocity decreases and liquid pressure increases. The higher pressure now surrounding the bubbles causes them to implode, producing shockwaves which propagate through the liquid. These shockwaves can cause metal fatigue and excessive wear on the internals of the valve. The collapsing bubbles also make a discernible sound with accompanying vibration. The cumulative effects of cavitation can cause rapid deterioration of valve internals, resulting in reduced control function, frequent need for service, or premature failure.
Flow Meter Remanufacturing, Custom Flow Solutions, Full Service Repair, Calibration, and Valve Automation Center. www.teco-inc.com | 800-528-8997

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Best visual of cavitation on youtube.