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

Single-stage regulators lower pressure in one step to deliver pressure within a specific range. Regulators devised like this will show a negligible variation in delivery pressure as the cylinder pressure falls during use. This is why single-stage regulators are the right choice for jobs where a constant outlet pressure is not urgent, where an operator can monitor and readjust pressure, or where inlet pressure is constant.

Dual-stage regulators have the same function as single-stage regulators. But, in this case, the delivery pressure stays constant as cylinder pressure declines. Higher accuracy in pressure control is sustained because the pressure reduction is performed in two steps. Dual-stage regulators are suggested for applications requiring a constant outlet pressure over the life of a gas cylinder.

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