Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . k brake valve. The next notch after positivelap is the first service graduating notch, and when thehandle is in this position the brake valve will allowabout five pounds of trainpipe pressure to exhaust,when it will automatically lap itself. The secondgraduating notch will allow about eight pounds oftrainpipe pressure to exhaust, when the valve willautomatically lap itself. The next notch will causean exhaust from the trainpipe of elev
Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . k brake valve. The next notch after positivelap is the first service graduating notch, and when thehandle is in this position the brake valve will allowabout five pounds of trainpipe pressure to exhaust,when it will automatically lap itself. The secondgraduating notch will allow about eight pounds oftrainpipe pressure to exhaust, when the valve willautomatically lap itself. The next notch will causean exhaust from the trainpipe of eleven pounds pres-sure. The fourth notch causes a sixteen-poundreduction, and the fifth notch is full service position 6o2 LOCOMOTIVE ENGINEERING causing a reduction in trainpipe pressure of twenty-three pounds. When the handle is placed in any oneof the service graduating positions, the brake valvewill automatically lap itself, but when the handle isplaced in the emergency position, then the automaticlap feature is eliminated. When the valve automati-cally laps itself, the equalizing piston moves the cut-off so that it covers port F, but when the handle of. n n Figure 255Showing Poet O in Main Slide Valve Seat FACE OF SLIDE VALVE K p^r Figure 255 a the valve is moved to positive lap position, the mamvalve slide places port F over the cut-off valve. Should the handle be placed in the five-poundnotch, and while it was in this position trainpipe leak-ages should cause the trainpipe pressure to be reducedto sixty pounds or less (when working with a seventy-pound standard) then, when the handle was movedto the eight-pound notch, there would be no exhaust AUTOMATIC AIR BRAKES 603 from the trainpipe, for the reason that the trainpipeleakages would cause the pressure in chamber D topush the equalizing piston forward, and cause thecut-off valve to keep exhaust port F closed. This is asplendid feature of the New York brake valve. Asthe automatic lap feature is dependent upon theproper move
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlocomot, bookyear1916
