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 defined range. Regulators designed accordingly 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 jobs where a constant outlet pressure is not crucial, where an operator can supervise and readjust pressure, or where inlet pressure is constant.

Dual-stage regulators perform the same function as single-stage regulators. But delivery pressure remains constant as cylinder pressure decreases. Higher accuracy in pressure control is kept because the pressure reduction is achieved in two steps. Dual-stage regulators are recommended for applications necessitating a constant outlet pressure throughout the life of a gas cylinder.

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