August 2008

Special Report: Fluid Flow and Rotating Equipment

Maximum throttling of manual valves without damage

Use these graphs to avoid damage to internals and piping

In the liquid fluid systems of industrial plants, sometimes it is necessary to throttle a manual valve to adjust the flow or the system pressure to the required values. This operation is correct if the valve is running free of cavitation, but based on my experience, not many people know if the throttled valve has critical cavitation or not. The reasons may be that the valve is not accessible to hear the noise that it produces, the valve noise is covered by the plant noise, the valve noise could be due to incipient but not critical cavitation, etc. To help know how much a manual valve may be throttled without damage, I have translated the cavitation coefficients given in References 1 and 2

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