. American engineer and railroad journal . in the disc balance of this company, but employed in thiscase to produce wedging action on the packing rings and to secure steam-tight joints to keep the steam from getting underthe packing rings. In Fig. 1, A is a wedge ring under which boiler steam is ad-mitted through the ports, G. This ring has ground joints withthe solid rings, C, which may be made with or without snap rings, B, may be made of any form or size, and theseare wedged tight against the valve spool, B, and the follower, D,by the steam pressure inside of the ring. A. The sp
. American engineer and railroad journal . in the disc balance of this company, but employed in thiscase to produce wedging action on the packing rings and to secure steam-tight joints to keep the steam from getting underthe packing rings. In Fig. 1, A is a wedge ring under which boiler steam is ad-mitted through the ports, G. This ring has ground joints withthe solid rings, C, which may be made with or without snap rings, B, may be made of any form or size, and theseare wedged tight against the valve spool, B, and the follower, D,by the steam pressure inside of the ring. A. The spaces underth2 snap rings, B, are vented to the exhaust so that pressurecan not accumulate under them. The rings are put under ten-sion and turned on their outside diameter, so as to be perfectlycylindrical and true with the valve casings when placed in posi-tion. They are elastic and tend at all times to expand to fitthe casing. When the throttle is closed the parts are free -3-— —28X- t<J/ii« - -Vi- —/i^*! Taper V^in J< ???. to adjust themselves to fit the casing, and when steam is ad-mitted to the chest and to the center of the valve the wedgerings act at once to lock the packing rings in position, whichproduces essentially a plug valve as long as the pressure is principle of Fig. 1 is used in the other forms the two designs for trial the valves are arranged for internaladmission, but the parts may be reversed for outside admis-sion. These valves have continuous steam and exhaust lines be-cause the rings are tapered at the joints and the joint plates July, 1900. AMERICAN ENGINEER AND RAILROAD JOURNAL. 217 are tapered to fit the tapers of the rings at the joints. Thesteam-tight joints are made by the taper ring, which is easilyground to fit the face of the packing ring and the seat on theend of the valve spool. The arrangement is very simple, andthe taper ring, being inside the flange of the packing ring, isprotected, and it can not fall out
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
