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Time-based surge relief valves - interrupted operation?

I am modelling a system with an existing relief valve set to discharge when a system reaches pressure of >700kPa. Advice from the supplier is that the valve could take 10 seconds to open and 60 seconds to close - so for the first time I am trying the new time-based SRV functionality.

The model results look surprising to me though, and I just want to test my understanding of how this is modelled. It seems as though once the valve is triggered to open, it has to go through the full cycle of opening and closing regardless of the actual system conditions? For example, the valve closure cannot be interrupted if, in the meantime, the pressure rises above 700 kPa once again - rather, once it has closed over 30 seconds, it can then start opening again. Do I have this correct?

Ideally, I would want to set the valve with Kv/Cv curve, 'time to fully open' and 'time to fully close' and then let it respond to the actual conditions. Is there a way to do this?

Thanks, Liz