. Tentative revised boiler safety orders. 1 1 1 1 7^ i Y 1 1 1 j\ K-V-->t t l^ j S o 3OUJ z: UJ oo UJ a: UJ o QUJ ft:. to oo M M o O CO o appendix 117 Automatic Water Gages 427. Automatic shut-off valves on water gages, if permitted tobo used, shall conform to the following requirements: a. Cheek valves in upper and lower fittings must be of the solidnon-ferrous ball type to avoid corrosion and the necessity forguides. &. Ball check valves in upper and lower fittings must open bygravity, and the lower ball check valve must rise vertically toits seat. c. The check balls must not be smaller t
. Tentative revised boiler safety orders. 1 1 1 1 7^ i Y 1 1 1 j\ K-V-->t t l^ j S o 3OUJ z: UJ oo UJ a: UJ o QUJ ft:. to oo M M o O CO o appendix 117 Automatic Water Gages 427. Automatic shut-off valves on water gages, if permitted tobo used, shall conform to the following requirements: a. Cheek valves in upper and lower fittings must be of the solidnon-ferrous ball type to avoid corrosion and the necessity forguides. &. Ball check valves in upper and lower fittings must open bygravity, and the lower ball check valve must rise vertically toits seat. c. The check balls must not be smaller than % in. diameter, andthe diameter of the circle of contact with the seat must notbe greater than 2/3 of the diameter of the check ball. Thespace around each ball must not be less than % in., and thetravel movement from the normal resting place to the seatmust not be less than 14 i^- d. The ball seat in the upper fitting must be a fiat seat with•either a square or hexagonal opening, or otherwise arranged so that the steam passage can never be completely closed by thisvalve. e. The shut-off valve in the upper
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteambo, bookyear1919
