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

Single-stage regulators lower pressure in just one step to effect pressure within a specified range. Regulators designed in this way will show a small variation in delivery pressure as the cylinder pressure decreases during use. This is why single-stage regulators are the right choice for uses where a constant outlet pressure is not urgent, where an operator can supervise and readjust pressure, or where inlet pressure is steady.

Dual-stage regulators provide the same function as single-stage regulators. But delivery pressure holds steady as cylinder pressure falls off. Higher accuracy in pressure control is sustained because the pressure reduction is achieved in two steps. Dual-stage regulators are suggested for applications calling for a constant outlet pressure throughout the life of a gas cylinder.

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