Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . and Nut; 25, Cylinder-Cap Gasket; 26, Equalizing Piston; 2y, Equalizing-Pis-ton Packing Ring; 28, Graduating Valve; 29, Graduat-ing-Valve Spring; 31, Equalizing Slide Valve; 32, Equal-izing-Slide-Valve Spring; 33, Lower Cap Nut; 34, SafetyValve; 35, Double-Chamber Reservoir; 36, ReservoirStud and Nut; 37, Reservoir Drain Plug; 38, Distribut-ing-Valve Drain Plug; 39, Application-Valve-CoverGasket; 40, Application Piston Cotter; 41, Dist
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . and Nut; 25, Cylinder-Cap Gasket; 26, Equalizing Piston; 2y, Equalizing-Pis-ton Packing Ring; 28, Graduating Valve; 29, Graduat-ing-Valve Spring; 31, Equalizing Slide Valve; 32, Equal-izing-Slide-Valve Spring; 33, Lower Cap Nut; 34, SafetyValve; 35, Double-Chamber Reservoir; 36, ReservoirStud and Nut; 37, Reservoir Drain Plug; 38, Distribut-ing-Valve Drain Plug; 39, Application-Valve-CoverGasket; 40, Application Piston Cotter; 41, Distributing-Valve Gasket. Fig. 309 is a sectional view of the safety valve whichis a necessary part of the distributing valve. It is of animproved type, which insures reliability of operation. Itis unlike the ordinary safety valve, as its construction issuch as to cause it to close quickly with a pop action, ET BRAKE EQUIPMENT 695 insuring its seating firmly. It is very sensitive in opera-tion, and responds to very slight differences of pressure. The names of the parts are: 2, Body; 3, Cap Nut;4, Valve; 5, Stem Valve; 6, Adjusting Spring; 7, Ad-justing FIG. 309. SAFETY VALVE Valve 4 is held to its seat by the compression of thespring 6 between the stem and adjusting nut 7. Whenthe pressure below valve 4 is in excess of the force ex-erted by the spring, it raises, being guided in its move-ment by the brass bush in the body 2. Ports are drilledin this bush; one outward through the body to the at-mosphere, and the other upward to the spring chamber. 6g6 LOCOMOTIVE ENGINEERING Although only one of each of these is shown in the cut,there are eight of the first and two of the second. Asthe valve moves upward, its lift is determined by thestem 5 striking the cup nut 3. It closes the vertical portsconnecting the valve and spring chambers and opens thelower ports to the atmosphere. As the air pressure be-low valve 4 decreases, and the tension of the springforces the stem and valve do
Size: 987px × 2533px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
