Brake Tests

53 A pipe bracket, Fig. 34, to which all pipe connections are per- manently made and to which the various portions of the valve device are bolted. This bracket contains two small chambers, the quick action chamber and quick action closing chamber. The quick action closing chamber provides means whereby the quick action outlet from the brake pipe to the atmosphere is open when an emergency application is made and is closed when a predetermined time thereafter has elapsed. The quick action chamber in connection with the quick action closing chamber controls the operation of the quick action parts of the valve in accordance with the rate of brake pipe reduction. 115. In addition to the above the equipment on each car comprises:— An auxiliary reservoir which is the same size for all sizes of brake cylinders, the pressure in which controls the movement of the equal- izing piston and slide valve of the universal valve and supplies air to the brake cylinder. A service reservoir which varies in size with the size of the brake cylinder. This, together with the auxiliary reservoir, supplies air for operating the brake cylinder in service and emergency brake appli- cations. An emergency reservoir which varies in size according to the size of brake cylinder used and the amount of emergency brake cylinder pressure which the installation is designed to afford. This reservoir supplies air required to graduate the release of the brakes and to obtain the quick recharging of the service and auxiliary reservoirs after a service application of the brakes. It also provides the additional supply of air required to obtain the increased brake cylinder pressure desired for emergency applications. I16. In addition to the above, various electrical details are used on the locomotive and cars as illustrated in Fig. 27 and Figs. 35 to 40. Complete Pneumatic Equipment. Charging AND RECHARGING AFTER BRAKE Application. 117. The compressed air required for charging the reservoirs initially must all come from the brake pipe, its flow to the various reservoirs and chambers being controlled by the equalizing portion of the universal valve. Graduated Release Cap Set for Graduated Release. 118. In charging after a service brake application the air from the emergency reservoir (in whicli the pressure has not been reduced from its original value of 110 pounds during the preceding service applica- tion) flows to the auxiliary reservoir. When this is recharged to within five pounds of the pressure then remaining in the emergency reservoir, the service reservoir charging valve opens and permits the air from the