Locomotive appliances . OMOTIVE APPLIANCES. valve (E) to waste pipe at G, and cannot, therefore,become stuck fast by lime or other sediment. It willreadily be seen that it is impossible for the two littleballs to go to their seats exceptwhen the glass breaks andthey take the positions shownby dotted lines. To blow off, the lower handleis turned a half turn to theright, or toward the closedposition for valve (F). E is a double-seated valveshown by Fig. 1 as off fromboth seats, its position whenthe gauge is being blown off,which is accomplished by sim-ply turning the lower handle,no pet cock bei
Locomotive appliances . OMOTIVE APPLIANCES. valve (E) to waste pipe at G, and cannot, therefore,become stuck fast by lime or other sediment. It willreadily be seen that it is impossible for the two littleballs to go to their seats exceptwhen the glass breaks andthey take the positions shownby dotted lines. To blow off, the lower handleis turned a half turn to theright, or toward the closedposition for valve (F). E is a double-seated valveshown by Fig. 1 as off fromboth seats, its position whenthe gauge is being blown off,which is accomplished by sim-ply turning the lower handle,no pet cock being used. Thesteam follows the course shownby the arrows (B) to the out-let (G), the steam pressure beingdown on the ball. In closing,the partition at the left of theball {D) prevents the action ofthe boiler pressure from sud-denly moving the ball to itsseat. If, however, the glassbreak, the rush of steam to theglass, via arrows {A), causesan eddy or vacuum whichthe ball to its seat, shown byThe ball (D) resting on valve. Fig. 2. Star Self-Closing Water Gauge. immediately throwsball C (dotted lines). (E) is rolled about and agitated every time the LOCOMOTIVE APPLIANCES. 201 handle is turned to blow out the gauge, and cannotbecome stuck fast and fail to work at a criticalmoment. The upper half works on the same prin-ciple, but of slightly different construction. Fig. 2 shows a slightly different form of automaticwater gauge. Should the glass accidentally bebroken, the steam and water rushing out will force theballs up, and close the passages. After a new glass has been put in place, slowlyscrew in the wood wheels; the needle projections onthe stems will force theball away from the open-ings, and leave the pas-sages free and unobstruct-ed again. In the Crosby watergauge, shown in Fig. 3,both the upper and lowerpassages to the boilerare instantly and auto-matically closed by theball valves on the suddenbreaking of the glass,avoiding all danger to life and all inconvenience andwaste
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectlocomot, bookyear1901
