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

Single-stage regulators decrease pressure in just one step to deliver pressure within a specified range. Regulators designed like this will show a negligible variation in delivery pressure as the cylinder pressure decreases during use. Because of this, 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 stable.

Dual-stage regulators fulfill the same function as single-stage regulators. But, in this case, the delivery pressure holds constant as cylinder pressure falls off. Greater accuracy in pressure control is kept because the pressure reduction is brought about in two steps. Dual-stage regulators are recommended for applications calling for a constant outlet pressure throughout the life of a gas cylinder.

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