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

Single-stage regulators reduce pressure in a single step to effect pressure within a defined range. Regulators crafted like this will show a negligible variation in delivery pressure as the cylinder pressure drops during use. For this reason, single-stage regulators are most appropriate for jobs where a constant outlet pressure is not critical, where an operator can watch and readjust pressure, or where inlet pressure is stable.

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

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