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

Single-stage regulators decrease pressure in a single step to deliver pressure within a specified range. Regulators devised accordingly will show a slight variation in delivery pressure as the cylinder pressure falls during use. For this reason, 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 constant.

Dual-stage regulators serve the same function as single-stage regulators. But, in this case, the delivery pressure stays steady as cylinder pressure declines. Greater accuracy in pressure control is maintained because the pressure reduction is brought about in two steps. Dual-stage regulators are suggested for applications calling for a constant outlet pressure throughout the life of a gas cylinder.

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