When sizing a relief valve for a failed regulator scenario, what is typically done to determine what the "failed" characteristic of the regulator is? I'm finding it difficult to get a vendor/manufacturer to tell me a "fail Cv" for their regulator, or even what the internal orifice diameter is. I'm also facing skepticism about whether any point on the performance curve from the manufacturer would accurately represent a failure state - the thought being that a performance curve may only represent a region of operation that is recommended for normal operation, and may not necessarily capture a wide-open or failed valve, in particular if one considers that a failure may represent a physical change to the regulator's internals that would not be represented by a performance curve. Furthermore, if given fail-Cv, without an orifice size, how does one determine a choked flow rate, not knowing the area where the choking occurs? I'm assuming one could determine an equivalent orifice size that would mimic the Cv provided, and then calculate choked flow based on that orifice? TIA
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