. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ase of a leaky ap-plication valve, it would increase brakecylinder pressure above application cylin-der pressure when the brake is appliedand cause a blow at the exhaust portwhile brake pipe pressure remained at a higher figure than application cylinderand brake cylinder pressures, providedthat brake cylinder leakage is not equalto or in excess of the volume of leakagethrough the defective part. In dealing with the effect of a leakinto the brake cylinders it will be notedtliat an increase of
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ase of a leaky ap-plication valve, it would increase brakecylinder pressure above application cylin-der pressure when the brake is appliedand cause a blow at the exhaust portwhile brake pipe pressure remained at a higher figure than application cylinderand brake cylinder pressures, providedthat brake cylinder leakage is not equalto or in excess of the volume of leakagethrough the defective part. In dealing with the effect of a leakinto the brake cylinders it will be notedtliat an increase of application cylinderpressure forces the application portion ofthe distributing valve into a position to■idmit air pressure to the brake cylin-ders, and during the operation a springis compressed and as soon as the pres-sures are equal the spring forces the valveto lap position. At this time a fall inapplication cylinder pressure causes ablow or escape of air at the exhaust port,provided brake cylinder pressure does note.«cape elsewhere, and naturally an in-crease of brake cylinder pressure from. Xo. 6 DISTRIBUTIXG VALVE QUICKACTION CYLINDER CAP. some other source, application cylinderpressure remaining constant, would havethe same effect of forcing the applicationpiston, to which the exhaust valve isattached, toward release position tmtilthe port opens sufficiently to per-mit air pressure to escape from the brakecylinders as fast as it is leaking intothem and, application cylinder pressureremaining constant, the leak at the ex-haust port represents the volume of leak-age into the brake cylinders in excess ofthat leaking from the cylinders to theatmosphere through other sources. Referring to this blow of air meanseither a constant or intermittent escapeof air while the brake is either appliedor released, but a light blow occurringat the distributing valve exhaust port justbefore the brake applies and ceases im-mediately as the brake does apply andshows no leakage wha
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