How large is the pressure drop of the check valve?
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As indicated in the title, I’m not sure what the exact voltage drop is; are there no relevant **specifications or standards** that set limits on this voltage drop? I only know that, generally, swing-type valves of the same specification are smaller than lift-type ones. I heard that in some cases the pressure drop exceeds 2 kilograms. How should one choose a value for estimating the pressure drop in the future?
Is it based on experience or on some evidence?