Diseases of the air brake system; their causes, symptoms and cure . ly it was very hard to move, and if it was left looseit was constantly leaking. BRASS ENGIXEERS VALVE. The next valve to come into general use was a smallbrass valve with a rotary disk as the main operative had an excess pressure valve and a spring devicefor cushioning the valve, which cut off the exhaust of airin applications of the brakes. This valve had severalsprings in it which gave considerable trouble from weak-ening, and one which bothered considerably because ofthe corrosion making it brittle and stiff. The
Diseases of the air brake system; their causes, symptoms and cure . ly it was very hard to move, and if it was left looseit was constantly leaking. BRASS ENGIXEERS VALVE. The next valve to come into general use was a smallbrass valve with a rotary disk as the main operative had an excess pressure valve and a spring devicefor cushioning the valve, which cut off the exhaust of airin applications of the brakes. This valve had severalsprings in it which gave considerable trouble from weak-ening, and one which bothered considerably because ofthe corrosion making it brittle and stiff. The one whichweakened the most was that which was placed just abovethe main or rotar\^ valve, or more accurately, just withinthe head of the handle, and the result of this was tocause leakage in the train-pipe in the running positionor on lap. The excess pressure valve was the onewhich bothered by getting corroded, and this was becausethis was placed right in the center of the main body ofthe valve, and arranged in such a way as to be exposedto all the oil and 02) Plate 10. Diseases of the Air Brake System. 43 Strange as it may seem, this small valve, the onerequiring cleaning and repairs most frequentl}^ wasplaced in the position most difficult to reach. To get itout required the taking apart of the whole valve. EQUALIZING DISCHARGE-VALVE. Following the second one came the equalizing discharge-valve, and this we have shown on plates 8, 9 and 10, asit was first put into most general use. The modifiedform now supplied b} AVestinghouse, of which we shalltreat later, is, in most respects, the same in principle, themain difference being in the use of the feed-valve insteadof an excess pressure valve. The parts of this valve most frequently requiring atten-tion are, the rotar}^-valve (13), excess pressure valve (21),and equalizing piston (17). These should all be taken outfrequently and cleaned. OILING PARTS. The rotar} and piston should be carefull}^ oiled beforereplacing, some
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