Dodatkowe przykłady dopasowywane są do haseł w zautomatyzowany sposób - nie gwarantujemy ich poprawności.
Maintain boiler with 5-10 lbs. pressure for three to four hours, periodically opening the scum valve, if fitted.
In districts where the feed water is unsuitable, blowdown valves ("scum valves"), either continuously working while the regulator is open or operated in conjunction with the boiler feed, are fitted.