Microsoft Word Course Control valves R. doc

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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

How to avoid Cavitation:
If cavitation is ever encountered, consider the following corrective actions
1. The first is to equip the control valve with special trim and ensure that the plug and seat are made of a hard facing material that can resist both the onset and effect of cavitation (e.g. stellite hard facing.
2. The second is to use a valve with a low recovery coefficient (see below.
3. The third is to increase the downstream pressure by installing a flow restrictor if possible or reducing the pipe size of a short piece downstream.

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