Diseases of the air brake system; their causes, symptoms and cure . -for a governor to work very sensitively is something thatis not understood by many air-brakemen, and yet if agovernor does not meet this requirement it will give agreat deal of trouble in ser\ice from sticking of the brakesor loss of excess pressure where the connection is madeto the train-pipe. RELATION OF GOVERNOR TO EXCESS PRESSURE. Many men may want to know what the governor hasto do with the excess pressure when the connection ismade to the train-pipe and not to the drum. Let us con-sider a common difficulty in service t
Diseases of the air brake system; their causes, symptoms and cure . -for a governor to work very sensitively is something thatis not understood by many air-brakemen, and yet if agovernor does not meet this requirement it will give agreat deal of trouble in ser\ice from sticking of the brakesor loss of excess pressure where the connection is madeto the train-pipe. RELATION OF GOVERNOR TO EXCESS PRESSURE. Many men may want to know what the governor hasto do with the excess pressure when the connection ismade to the train-pipe and not to the drum. Let us con-sider a common difficulty in service that will help to makethis point clear. Frequently, on the road, when theengineers valve handle is in the running position and themain drum has 90 pounds and the train-pipe 70 poundspressure, with the pump stopped, the excess pressure willgradually begin to disappear, the red pointer or maindrum pressure sometimes falling a little below the black. firadli Plate 7. New York Governor. Diseases of the Air Brake System 29 one, till the black one begins to fall with it and the brakesset and drag before the pump can get to work and releasethem. Of course, it may be said that this trouble is dueto leakage; and so it is; but the fact remains, that if thegovernor were in proper shape it would not occur. Someleakage is unavoidable, such as will be lost through bellringers, sanding apparatus or other auxiliary devicesattached to the air-brake system. The case describedjust above is most liable to occur on trains where there islittle leak in the train-pipe, for a heavy leak in the train-pipe would not permit the pump to stop. BUCKLING OF DIAPHRAGM. Another part liable to get out of order is the soft metaldiaphragm (19), which sometimes gets loose at the edges,or buckles. In the experience of the writer, however,this is not of very frequent occurrence. Altering thelength of the valve (17) is a very bad thing to do, as it mayget so short as
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