Discharge temperature of the safety valve for mixed components?

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Dear seniors, I have been studying the issues related to safety valves recently. The specifications state that the discharge volume under the top-of-tower reflux condition is the amount of steam at the discharge pressure. However, in the equilibrium PFD, it should be the steam component at the operating pressure. So how do I convert this to the component value at the discharge pressure? How exactly is this calculation done? Is it by calculating each component individually using PV=nRT? Does that mean assuming that the temperature remains constant? But then how is the discharge temperature determined? Or should I calculate the new equilibrium at the discharge temperature? I would like to ask everyone for examples of manual calculations. I want to know what the essence is, so I’m not asking about ASPEN calculations for now