. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . iripe Tap Fig. 65. Single-Pressure Retain-ing Valve, Open. Fig. 66. Single-Presi3ure RetainingValve, Closed is then closed between the two reservoirs by means of the by-passvalve spring and valve. In emergency position the communication with the safety valveis cut off and the pressure is held until the brake is released. MISCELLANEOUS TYPES OF VALVES Pressure Retaining Valve. The pressure retaining valve is aregular part of all freight car equipment and is fu
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . iripe Tap Fig. 65. Single-Pressure Retain-ing Valve, Open. Fig. 66. Single-Presi3ure RetainingValve, Closed is then closed between the two reservoirs by means of the by-passvalve spring and valve. In emergency position the communication with the safety valveis cut off and the pressure is held until the brake is released. MISCELLANEOUS TYPES OF VALVES Pressure Retaining Valve. The pressure retaining valve is aregular part of all freight car equipment and is furnished with passen-ger car equipments only on special order. It is usually fastened onthe end of the car, by means of lag screws, in a convenient position. 88 AIR BRAKES and is connected to the triple-valve exhaust port by the retaining- valve pipe. Pressure retaining valves are built in two types: namely, plain, or single-pressure; and com-bined high- and low-pressure. The plain, or single-pressure, re-taining valve. Figs. 65 and 66, con-sists of a plug cock 6 connected tothe retaining valve pipe at X andhaving two outlets, one to the atmos-phere and the other to the retainingvalve prop
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