What is the difference between a single-stage and a dual-stage regulator?

Single-stage regulators reduce pressure in just one step to deliver pressure within a specific range. Regulators crafted in this way will show a negligible variation in delivery pressure as the cylinder pressure falls during use. For this reason, single-stage regulators are most appropriate for uses where a constant outlet pressure is not crucial, where an operator can watch and readjust pressure, or where inlet pressure is steady.

Dual-stage regulators fulfill the same function as single-stage regulators. But delivery pressure stays constant as cylinder pressure decreases. Greater accuracy in pressure control is kept because the pressure reduction is brought about in two steps. Dual-stage regulators are recommended for applications calling for a constant outlet pressure for the life of a gas cylinder.

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