["< sod > a'''a pressure regulator'''is just a [ [ enclosure valve ] ] that automatically cuts head off the flow of a liquid or gas at a certain pressure. regulators are used to allow high - pressure fluid in supply lines or tanks to be reduced to safe quality and usable pressures for very various applications. < eod > < sod > a'''pressure regulator'''is a control [ [ isolation valve ] ] that reduces the input pressure of a fluid to a desired value at its own output. < individual eod >"]