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Answers for buyers choosing and looking after fuel gas regulators for gas cutting and welding sets.
A regulator reduces the high pressure in the cylinder to a steady, lower working pressure that suits your torch. On a two-gauge regulator, one gauge normally shows the cylinder (inlet) pressure, which tells you roughly how much gas is left. The other shows the working (outlet) pressure that you set with the adjusting screw.You only get a true working-pressure reading once gas is flowing or the downstream valve is set as the maker describes. After you close the cylinder valve and release the pressure, both gauges should fall to zero.
A single-stage regulator reduces pressure in one step. It is simple and gives good response to flow changes, but the outlet pressure can drift as the cylinder empties, so you may need to re-set it during long jobs. A two-stage regulator reduces pressure in two steps and keeps the outlet pressure nearly constant as the cylinder empties, though the outlet can fall a little more when flow rises.For typical hobby and workshop use, with short sessions and a frequent check of the flame or pressure, a single-stage regulator is often adequate. Check the maker's literature for the model you are considering.
Regulators are made for a specific gas. Springs, diaphragms, seals, gauge ranges and connections are designed around that gas and its working pressures, and the connections differ so that the wrong one will not fit. Do not use adaptors to force a regulator onto a different gas.Acetylene in particular has its own pressure limits and requirements, and a regulator that is not designed for it is unsafe. Always buy the regulator marked for the gas you are using, and follow the maker's instructions for any change of gas.
Fuel gas connections are designed to differ from oxygen and other non-fuel gas connections so that they cannot be mixed up. Fuel gas nuts are often marked with a notch on the flats, and you should check the thread type and the direction to turn before you tighten.Connect by hand first to avoid cross-threading, then tighten snugly with a suitable spanner. Do not over-tighten. Never use oil or grease, and do not use sealing tape or jointing compound unless the regulator maker's instructions say so. Check the cylinder outlet type before buying, because cylinder connections vary and the regulator inlet must match.
Acetylene becomes unstable at higher pressures, so the working pressure must be kept within the limit for your equipment. The maximum depends on the equipment and the maker states it, and the pressure must never go above it. For this reason an acetylene regulator must be one designed and marked for acetylene.Set the working pressure on the outlet gauge to the torch maker's recommendation, never above the limit for your equipment. Do not alter or adjust the internal parts of a regulator.
A flashback arrestor stops a flame travelling back into the regulator, hose or cylinder. Use only regulators, flashback arresters, hoses and blowpipes designed for acetylene and oxygen respectively, and fit flashback arresters onto the pressure regulators on both the acetylene cylinder and the oxygen cylinder. For long lengths of hose, fit arresters on both the blowpipe and the regulator. Fitting arresters is not a substitute for safe working practices.Arrestors need regular checking and replacement, so ask the maker or your gas supplier which type suits your equipment.