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

Single-stage regulators decrease pressure in one step to deliver pressure within a specified range. Regulators designed accordingly will show a negligible variation in delivery pressure as the cylinder pressure drops during use. Because of this, single-stage regulators are most appropriate 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 provide the same function as single-stage regulators. Nevertheless, delivery pressure stays steady as cylinder pressure declines. Greater accuracy in pressure control is sustained 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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