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

Single-stage regulators reduce pressure in just one step to effect pressure within a specific range. Regulators designed like this will show a slight variation in delivery pressure as the cylinder pressure decreases during use. For this reason, single-stage regulators are the right choice for uses where a constant outlet pressure is not crucial, where an operator can monitor and readjust pressure, or where inlet pressure is stable.

Dual-stage regulators provide the same function as single-stage regulators. However, delivery pressure remains the same as cylinder pressure falls off. Increased accuracy in pressure control is maintained because the pressure reduction is achieved in two steps. Dual-stage regulators are favored for applications requiring a constant outlet pressure throughout the life of a gas cylinder.

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