. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . PLATE 42. List of Parts. 2. Babbitt Metal Ring 6. Vibrating Cup 3. Follower 7. Gland 4. Ball Joint 8. Preventer 5. Swab Cup 152 PISTON AND VALVE-STEM PACKING. Plate 43 shows a sectional view of valve-stem pack-ing. List of Parts. 2. Babbitt Metal Ring 6. Vibrating Cup 3. Follower 7. Gland 4. Ball Joint 8. Preventer 5. Swab Cup 9. Support. PLATE 43. Construction and Operation. The principle of opera-tion is as follows: The babbitt metal rings which serveto make
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . PLATE 42. List of Parts. 2. Babbitt Metal Ring 6. Vibrating Cup 3. Follower 7. Gland 4. Ball Joint 8. Preventer 5. Swab Cup 152 PISTON AND VALVE-STEM PACKING. Plate 43 shows a sectional view of valve-stem pack-ing. List of Parts. 2. Babbitt Metal Ring 6. Vibrating Cup 3. Follower 7. Gland 4. Ball Joint 8. Preventer 5. Swab Cup 9. Support. PLATE 43. Construction and Operation. The principle of opera-tion is as follows: The babbitt metal rings which serveto make the joint around the piston are the only partswhich come in contact with the rod. These rings arecontained in the vibrating cup, and are forced into the cupagainst the rod, which causes them to close as they be-come worn by steam pressure. The purpose of the springis to hold the rings and other parts in place when steamis shut off. A ground joint is made between the flat PISTON AND VALVE-STEM PACKING. 153 face of the vibrating cup and the ball joint. There is alsoa ground joint between the ball joint and the combination of the sliding face of the vibrating cupand the ball joint permits the packing to fit around therod closely, without any increase in friction. Should thepiston be out of line by reason of wear occurring betweenpiston head and cylinder, it will cause more or less vibra-tion of the piston rod, and if not protected by the slidingface of the
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