. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 28. Plan and Sectional Elevation of Westinghouso S-fiIndependent Brake \alve running position, as the application-cylinder pressure can thenescape through the release pipe and the automatic brake vahe. Slow-Application Position. This position is used for lightor gradual applications of the independent or locomotive brake. 46 AIR BRAKES Quick-Application Position. This position is used for quickapplications of the independent or locomotive brake. Lap Posi
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 28. Plan and Sectional Elevation of Westinghouso S-fiIndependent Brake \alve running position, as the application-cylinder pressure can thenescape through the release pipe and the automatic brake vahe. Slow-Application Position. This position is used for lightor gradual applications of the independent or locomotive brake. 46 AIR BRAKES Quick-Application Position. This position is used for quickapplications of the independent or locomotive brake. Lap Position. This position is used to hold the independentor locomotive brake after the desired cyHnder pressure is this position all communication between ports is closed. Release Position. This position is used to release the pressurefrom the application cylinder when the automatic brake valveis not in running position. The supply pressure in the independent brake valve is limitedby a reducing valve to 45 pounds. Connected to the handle of. Fig. 29. Diagrams Showing Positions of Valve Handles for WestinghouseAutomatic and Independent Brake \alves the independent brake valve is a return spring, the purpose of whichis to return the handle from the release to the running position,or from the quick-application to the sloiv-application position. Theautomatic return from release to running is to prevent leaving thehandle in that position and make it impossible to operate the inde-pendent brake by the automatic brake valve. The spring returnfrom quick application to sloiv application is to give a resistance tounintentional moving of the valve handle to quick-applicationposition when only a slow application is desired. The operation of the ^H-6 and ^^S-6 brake valves will bestudied further in connection with the study of the ET equipment. AIR BRAKES 47
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