Valve Sizing Considerations

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  Valve Sizing Considerations Steven Hocurscak Metso Automation  © Metso OversizingYour Valves Issue with oversized valve ã  A valve that is oversized can cause premature failure of valve trim or body - Oversized valves have low opening angles, and lower opening angles increasethe velocity of the liquid - Properly sizing control valves can dramatically improve performance and life E, loss of materialE, loss of material    E   R   O   S   I   O   N ,   E FLOW VELOCITY, v 2  © Metso Guideline for Proper Valve Sizing Solution to oversizingyour valves ã Maintaining larger opening angles (above 20%) is ideal for flowconditions that are seen often - If the condition is a startup case that will only be seen a few times a year, it’s okayto size the valve in this application. - On a normal flow condition ideally we want the valve to be open around 50% 3  © Metso Guideline for Proper Valve Sizing Death by oversizing ã Seat is eroded away ã Segment showssigns of erosion 4
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