. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . 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
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . 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. Fig. 30. WestinghouseDuplex Air Gage The plan view of both the TI-G and S-G brake valves shownin Fig. 29 presents a little more clearly the different positions ofthe brake-valve handles. Duplex Air Gage. The duplex air gage previously referredto is located on a convenient place in the cab in plain view of theengineer. In the ordinary equipment onlyone gage is required. In the ET equip-ment two are provided. The gage, see , is of the Bourdon type and has two pipeconnections to the brake valve, one of whichis in constant communication with the mainreservoir (red hand) and the other is in con-stant communication with the equalizingreservoir (black hand). The second gagefurnished with the ET equipment hasone of its two pipes connected to the brake cylinder (red hand) andthe other to the brake pipe (black hand). FEED VALVES The function of the feed valve has already been the G-6 brake valve it forms a part of the valve. The twoforms most commonly found inservice are the
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