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

Single-stage regulators decrease pressure in just one step to deliver pressure within a specified range. Regulators crafted like this will show a negligible variation in delivery pressure as the cylinder pressure drops during use. This is why single-stage regulators are most appropriate for applications where a constant outlet pressure is not urgent, where an operator can watch and readjust pressure, or where inlet pressure is steady.

Dual-stage regulators serve the same function as single-stage regulators. That said, delivery pressure remains constant as cylinder pressure decreases. Higher accuracy in pressure control is kept because the pressure reduction is delivered in two steps. Dual-stage regulators are favored for applications calling for a constant outlet pressure throughout the life of a gas cylinder.

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