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

Single-stage regulators lower pressure in one step to effect pressure within a specific range. Regulators designed accordingly will show a slight variation in delivery pressure as the cylinder pressure decreases during use. Because of this, single-stage regulators are the right choice 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 have the same function as single-stage regulators. Nevertheless, delivery pressure holds steady as cylinder pressure falls off. Increased accuracy in pressure control is kept because the pressure reduction is achieved 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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