a standard, model, or pattern. 2. general level or average: Two cars per family is the norm in most suburban communities. 3. Education. a designated standard of average performance of people of a given age, background, etc. a standard based on the past average performance of a given individual.
For example, pressure regulators are used in gas grills to regulate propane, in home heating furnaces to regulate natural gases, in medical and dental equipment to regulate oxygen and anesthesia gases, in pneumatic automation systems to regulate compressed air, in engines to regulate fuel and in fuel cells to regulate hydrogen.
Controls on the driver's side of the footplate. The regulator is the 'throttle' of the locomotive; it controls the delivery of steam from the boiler into the cylinders. With the regulator fully open, a high volume of steam is admitted, and maximum power may be generated. However, the cylinder power is influenced by the reversing gear.