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.
The inside of the regulator is fitted with a diaphragm and either an O-ring, a washer or both. In actuality, a regulator is a simple plumbing fixture that is made to reduce or increase the water pressure.. Inspect the top of the pressure regulator valve. There should be a hexagonal fitting on the top cover that looks much like a large bolt head. Use an adjustable wrench to turn the fitting counterclockwise to remove the cover.