. American engineer and railroad journal . okebox from the space containing the superheater header andthe tube ends. A flat damper valve connects the spaces andthis valve is opened by the steam pressure in the steam pipesacting through a small cylinder shown on the side of thesmokebox. When the throttle is open this valve is also openand it closes by action of a counterweight when the throttleis closed. With this device the superheater tubes cannotbecome highly heated when steam is not passing through themand thus the greatest danger of burnt tubes is avoided. Itwill be noted that with this co
. American engineer and railroad journal . okebox from the space containing the superheater header andthe tube ends. A flat damper valve connects the spaces andthis valve is opened by the steam pressure in the steam pipesacting through a small cylinder shown on the side of thesmokebox. When the throttle is open this valve is also openand it closes by action of a counterweight when the throttleis closed. With this device the superheater tubes cannotbecome highly heated when steam is not passing through themand thus the greatest danger of burnt tubes is avoided. Itwill be noted that with this construction the smokebox isnecessarily long to receive the superheater header, but thatits diameter is not enlarged as was required with the earlierconstruction of smokebox superheater. The header takes thesuperheater tubes in groups of four. A detail drawing on page317 shows the manner of securing the tubes to the heater sothat they may be easily removed. The steam-tight joints aremade against copper wire gaskets. The detail drawing below. DETAILS OP HICH-PRESSUKE VALVE. illustrates the construction of the header and the arrangementof the partitions. Other interesting details of this designwill be presented in future numbers of this journal. Both high and low-pressure valves are of the double portedpiston type with internal admission. The low-pressure valvehas L rings except the central ones on each side. The high-pressure valve is interesting in that it embodies unusual fea-tures to provide for the high temperature of the superheatedsteam. The packing rings are 514 and 2% ins. wide respective-ly, and are free to find their own bearings when the nuts aretight on the stem. They have no end movement, but adjustthemselves laterally over the ground joints. The central cagehas eight %-in. ribs. The cage, ribs and central portion of thespindle of this valve are protected from the highly heatedsteam by planished iron shields, as indicated in the iron is used in the const
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
