. Science of railways . p for Pistons with USmg this cup, It IS Enlarged Ends. desirable to increase the diameter of stuffmg box one-half of an inch. UNITED STATES \ALVE-STEM PACKING. It will be seen by reference to Fig. 4 that this pack-ing is very similar to the piston packing of the samemanufacture. A bushing or support, 9, is placedin the stuffing box to carry the weight of the valvestem. This support wears the valve stem less thanthe neck of the cylinder head formerly did, yet it iscertain to wear some flat place on the under side of thevalve stem the length of the valve travel when there
. Science of railways . p for Pistons with USmg this cup, It IS Enlarged Ends. desirable to increase the diameter of stuffmg box one-half of an inch. UNITED STATES \ALVE-STEM PACKING. It will be seen by reference to Fig. 4 that this pack-ing is very similar to the piston packing of the samemanufacture. A bushing or support, 9, is placedin the stuffing box to carry the weight of the valvestem. This support wears the valve stem less thanthe neck of the cylinder head formerly did, yet it iscertain to wear some flat place on the under side of thevalve stem the length of the valve travel when thereverse lever is hooked up in the position most when the valve is full stroked this flat placewould travel farther into the packing rings, and cause k 380 LOCOMOTIVE APPLIANCES. a bad lealc. This has been overcome in the design ofthis packing, by the use of the long, extended gland? and preventer 8, which render the distance betweenthe support 9 and the babbitt rings 2 slightly greaterthan the full valve Fig. States Valve Stem Packing. Parts referred to by numbers, in Fig. 4, are asfollows: 2—three babbitt rings in halves, known asone ring; 3—follower; 4—ball joint; 5—swab cup,-8—vibrating cup; 7—gland; 8—preventer; 9—sup-port. J. I LOCOMOTIVE APPLIANCES. 381 JEROME METALLIC PACKING. Fig. 1 represents the Jerome piston rod packing,embracing all the new improvements used parts designated by letter are: A—piston rod;B~the cone; C—the gland; D—the stuffing box;E—the packing rings; F—the follower; G—the coilspring; H—the bushing ring; J—stud bolts; K—sliding ground joint; L—cap screws, to hold the swab IffiDk. ■0
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