I see that pressure regulator curves show different flow rates, but I am confused by this because I was under the impression that the flow rate would be an "output" of the force/pressure balance across the pressure regulator. For example, assuming the inlet to a regulator is 500 kPa, and the outlet is 25 kPa. The flow rate through the regulator is 25 m3/hr. Say we want to increase that flow rate. Wouldn't we then have to increase the inlet gas pressure? If we increase the inlet gas pressure to 700 kPa, then wouldn't the poppet close a little more to maintain the 25 kPa outlet, and then this would decrease the gas flow rate? So then isn't the flow rate just an "output" of the pressure relationship across the regulator? I think I'm getting a bit mixed up with the relationship between flow and pressure. If anyone can shed some more light on this it would be greatly appreciated.