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 like this will show a small variation in delivery pressure as the cylinder pressure drops during use. For this reason, 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 serve the same function as single-stage regulators. Nevertheless, delivery pressure holds the same as cylinder pressure falls off. Higher accuracy in pressure control is kept because the pressure reduction is brought about in two steps. Dual-stage regulators are suggested for applications requiring a constant outlet pressure for the life of a gas cylinder.

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