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How can I model a surge anticipator (SAV) or surge relief valve (SRV) that opens between the pipes, not to the atmosphere?
The surge valve node element only discharges to the atmosphere when it opens. If you need to model a surge valve that opens between two pipes when a threshold is reached, you would need to model this with a Throttle Control Valve (TCV).
Start by running a transient simulation with the TCV closed the whole time (fixed pattern, initially closed). Check the pressure time history at the appropriate adjacent pipe end point to see the exact time when the desired threshold is reached. Then, build a transient valve operating rule based on that time. Basically have the pattern start with the valve closed until the time that you recorded, then have it start opening.
Then, do another transient run to see when the pressure subsequently reaches the condition to re-close the valve, then adjust the pattern appropriately, unless you will assume a specific amount of time that the valve stays open.
Modeling Reference - Surge Valves