C.F.R. » Title 49 » CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › PART 230—STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS › Subpart B—Boilers and Appurtenances

49 C.F.R. § 230.52

Water glass valves

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All water glasses shall be equipped with no more than two valves capable of isolating the water glass from the boiler. They shall also be equipped with a drain valve capable of evacuating the glass when it is so isolated.