There are many different kinds of regulator, but they all work on the same principle. The simplest type is the single stage regulator, which reduces the gas pressure from the cylinder to the level required by the appliance in one go.
The basic components of every regulator comprise a spring, a thin flexible rubber or metal disc called a diaphragm, and a valve.
Although not every regulator has pressure gauges, we’ve included them here to help show how the pressure changes as gas enters and leaves the regulator.