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Regarding the back pressure of safety valves

2015-12-03View Original

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The installation manual states that the back pressure of a safety valve (the pressure at the outlet of the safety valve) is equal to the pressure in the pressure relief pipe before the safety valve opens, plus the resistance to fluid flow once the safety valve starts to operate. How can this resistance to fluid flow be calculated? I would appreciate some guidance from those who know more about this. Thank you.

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