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Unlike Single Stage regulators which have less droop but a greater pressure effect, Multi Stage regulators show more droop but a smaller pressure effect. Multi stage regulators are also recommended for uses where pressure needs to be constantly delivered and not be adjusted.
A supply of constant pressure is one of the main advantages of using a Multi stage regulator as when gas leaves a gas cylinder, the pressure in the cylinder drops. As this happens, Single stage regulators show a ‘decaying inlet characteristic’ where the pressure increases as the inlet pressure decreases. Multi stage regulators compensate for this by providing a constant delivery of pressure regardless of the inlet pressure.