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

Single-stage regulators lower pressure in just one step to deliver pressure within a specific range. Regulators devised in this manner will show a negligible variation in delivery pressure as the cylinder pressure falls during use. Because of this, single-stage regulators are most appropriate for applications where a constant outlet pressure is not crucial, where an operator can monitor and readjust pressure, or where inlet pressure is steady.

Dual-stage regulators provide the same function as single-stage regulators. That said, delivery pressure holds the same as cylinder pressure falls off. Greater accuracy in pressure control is sustained because the pressure reduction is achieved in two steps. Dual-stage regulators are favored for applications calling for a constant outlet pressure for the life of a gas cylinder.

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