282

MODERN STEAM PRACTICE.

eccentric and rod being adopted, having a joint placed close upto the guide block for the valve rod, carried up considerably

Fig. 189.—Steam Valve for Horizontal Blowing Engine.a, Valve . b, Valve rod. c, Packing ring. d, Connecting pipe.

beyond the stuffing box, thus lessening the length of the eccentricrod.

The steam cylinder (Fig. 190) is of the ordinary description, withprojections cast on for bolting down to the bed plate. It is providedwith a cover and stuffing box at each end, through which the pistonrod passes, with recesses for the nut and collar that secures the pistonto the rod. The piston should be as light as practicable, and itsends strengthened with ribs in the casting; the packing is metallic,held up to the face with a number of short flat springs; the junkring is bolted down with bolts and nuts recessed in the piston inthe usual manner. To prevent radiation the cylinder and valvecasing are covered with feit and wood lagging; and Straps ofwrought iron or brass are used to bind securely the wooden stripsplaced over the feit. The main crank is of cast iron, and is con-nected to the piston rod by a wrought-iron rod, with straps, jibs,and keys at both ends, having a wrought-iron crosshead and gud-geon with blocks working in cast-iron motion bars; thus one endof the piston rod is truly guided, while at the back end it takes acrosshead working into a slipper guide, to which the piston rod forthe blowing cylinder is securely cottered.

The blowing cylinder (Fig. 191) is a plain casting, with side flangesfor bolting it to the bed plate which runs the entire length of the