Hi, I wanted to know if pressure regulators connected to gas cylinders provide constant outlet pressure, or provide constant pressure drop. Example of the regulator that might be used is this. http://secure.emiratesgas.com/eCom/details.asp?ProductID=ART01661_PR For instance, I have a gas cylinder having a pressure of 30 bar. I connect this regulator to the cylinder, and set the regulator to 2 bar. So will the outlet pressure, coming out from the regulator be 28 bar, or will it be 2 bar?