. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . d the vio-lent rush of air to the under side of thepiston will blow the dirt off the seat, ifit can be done. Under no circumstances should thehandle be placed in emergency positionfor the purpose of removing any dirt atsuch a time, as this would quickly with-draw the brake pipe pressure under thepiston and allow the pressure remaining inthe equalizing reservoir to force the valvedown hard on the seat, and if the obstruc-tion on the seat was a piece of metal, itwould be imbedded in the brass,
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . d the vio-lent rush of air to the under side of thepiston will blow the dirt off the seat, ifit can be done. Under no circumstances should thehandle be placed in emergency positionfor the purpose of removing any dirt atsuch a time, as this would quickly with-draw the brake pipe pressure under thepiston and allow the pressure remaining inthe equalizing reservoir to force the valvedown hard on the seat, and if the obstruc-tion on the seat was a piece of metal, itwould be imbedded in the brass, and couldnot be removed without taking the valveapart, and even if it was to be removed,the valve or seat would probably be badlycut, at least enough to practically disablethe brake valve for service operations. April, 1911. RAILWAY AND LOCOMOTIVE ENGINEERING. 169 I lie same thing would likclj occur, iiunder the same circumstances, the cut-outcock was to be turned and the handle placed on lap position, while a high prisure was stored in the equalizing reser-voir, as the leakage at the exhaust port. II 6 VALVE, VERTICAL SECTION. would quickly exhaust the brake pipepressure under the piston. If such anaction does occur at any time while outon the road, and the dirt cannot be re-moved in the manner described, it is bestto close the brake valve cut-out cock asthe opportunity presents itself, and thehandle can be placed in lap position andthe exhaust port plugged and the brakevalve will be handled in the same manneras though the port was plugged to over-come a broken equalizing reservoir a brake valve apart while out onthe road is a thing of the past, and is nolonger permitted. If a blow should start at the exhaustport while running along and the brakevalve handle has not been moved it mightconstitute a pretty severe test of a mansknowledge of the air brake. If this shouldoccur, and if a man could think fastenough in a case of this kind, and realizeat once that the pisto
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