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I have these curves from vendor

Can I use these curves as a characterization of my air combination air valves?

What would be a reasonable value for the transition volume or transition pressure? In someplace in the forum I read that the transition value would be the volume of air inside the valve, is this correct?

Can I use the air valve combined with other protection equipment, ie a surge release valve in the same node? I've tried this and get really weird results; the pressure spikes are higher than if I use only the SRV.

Thank you in advance.