ENGINEER'S BRAKE VALVES 



117 



OPERATION OF THE H-5 AUTOMATIC BRAKE VALVE 



This H-5 automatic brake valve, although modeled to a 

 considerable extent upon the principles of previous valves, is 

 necessarily different in detail, as it not only performs all the 

 functions of the other types but also those absolutely necessary 

 to obtain all the desirable operating features of the distributing 

 valve, which is used in connection with this brake valve. The 



FlG. 2 



positions of the brake-valve handle are shown in Fig. 2, from 

 which it will be noted that there is an extra position, called 

 holding position. In describing the operation of this brake 

 valve, the positions are taken up in the order in which they 

 are most generally used. 



Running Position. To release the engine and tender brakes, 

 or when the brakes are not being used and the system is charged 

 and ready for an application, the handle should be placed in 

 the running position. In this position, cavity / in the rotary 

 valve connects ports b and d in the valve seat, affording a 

 large direct passage from the feed- valve to the brake pipe, so 

 that the latter will charge up as rapidly as the feed-valve can 



