. Science of railways . Fig. Heavy Locomotive Globe Valve. seat. The projection under the disc protects the seatfrom dirt and from the cutting action of the steamwhen the valve is partly open, and also serves as aguide when re-grinding is necessary. Tore-grind one of these valves, remove the disc fromthe stem and grind it with a temporary holder screwedinto it. 574 LOCOMOTIVE APPLIANCES, 575 THE CEOSBY SPEING SEAT VALVE. This valve is shown in Fig. 2, which repre-sents the valve with a section of the body removedin order to show its internal design. A is theupper disc, in which a a
. Science of railways . Fig. Heavy Locomotive Globe Valve. seat. The projection under the disc protects the seatfrom dirt and from the cutting action of the steamwhen the valve is partly open, and also serves as aguide when re-grinding is necessary. Tore-grind one of these valves, remove the disc fromthe stem and grind it with a temporary holder screwedinto it. 574 LOCOMOTIVE APPLIANCES, 575 THE CEOSBY SPEING SEAT VALVE. This valve is shown in Fig. 2, which repre-sents the valve with a section of the body removedin order to show its internal design. A is theupper disc, in which a a represents the seat withits conical depression terminating in an annulargroove of considerable depth. C shows the valvebody, whereon at b b, in the valve seating B, is con-structed a conical seat having in the center a similar. Fig. Spring-Seat Valve. groove. These seats have greater contact surface,and by means of the central grooves have greaterresilient action, which permits them to shut tight andremain so. This novel characteristic prevents themfrom jamming when the valve is closed, and leavesthem free to accommodate themselves to any variationof temperature. When partially open, it is claimedthat the out-rushing steam or water does not abrade 576 LOCOMOTIVE APPLIANCES. their surfaces,valves. as ordinarily happens with ordinary THE HOMESTEAD STRAIGHT-WAY VALVE. This valve is so constructed that when it isclosed it is at the same time forced firmly toits seat. This result is secured by means ofthe traveling cam A through which the stem cam is prevented from turning with the stemby means of the lugs B, which move verticallyin slots. Supposing the valve to be open, thecam will be in the lower part of the chamber in
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