. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . s D. Outside Gland H. Retaining SpringsF. Packing Rings Construction and Operation. The gland used with theL. & K. packing (Plate 44) is made entirely of cast-ironand consists of five parts, as follows: B, Stuffing-BoxBushing; C, Tee Ring, which forms the grooves; D, Out-side Gland, which may have the swabholder cast on it ifdesired; G, two Split Cast-iron Re-enforcing Rings, heldtogether by steel Retaining Springs H. Parts B, C, andD are bored one-half inch la
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . s D. Outside Gland H. Retaining SpringsF. Packing Rings Construction and Operation. The gland used with theL. & K. packing (Plate 44) is made entirely of cast-ironand consists of five parts, as follows: B, Stuffing-BoxBushing; C, Tee Ring, which forms the grooves; D, Out-side Gland, which may have the swabholder cast on it ifdesired; G, two Split Cast-iron Re-enforcing Rings, heldtogether by steel Retaining Springs H. Parts B, C, andD are bored one-half inch larger in diameter than the fullsize of piston rod, which allows them to pass over any en-larged crosshead fitted to that size. The re-enforcingrings G have nothing to do with making a steam-tightjoint. Their only office, as their name implies, is to pre-vent the steam pressure from forcing the soft packingrings through the opening between the piston rod andthe bore of parts C and D. Accordingly, the re-enforcing PISTON AND VALVE-STEM PACKING. 155 rings are bored one thirty-second inch larger than the rodto prevent scoring PLATE 44. The grooves for holding the metallic packing and re-enforcing rings are formed by the Tee Ring C, the out- 156 PISTON AND VALVE-STEM PACKING. side face of B and the inside face of D. These faces aresmooth-finished, making steam-tight joints when thegland is in position. To allow the packing rings to follow any vibratorymotion of the piston rod, due to faulty alignment or wearof the crosshead, the diameter of the grooves is five-eighths of an inch and the width one thirty-second of aninch larger than the corresponding dimensions of thepacking rings. Valve-Stem Packing. Plate 45 shows a sectionalview of the valve-stem packing. List of Parts. B. Stuffing-Box Bushing C. Tee Ring D. Outside GlandF. Packing Rings By comparing Plates 44 and 45, it will be noted thatthe locomotive valve-stem and piston packing do not dif-fer in any material respect. When
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