-268 NO. 6 ET LOCOMOTIVE BRAKE 



"will flow through ports h and w, cavity k, and port * into the 

 distributing- valve release pipe, and then through the independ- 

 ent brake valve into the release pipe and out to the atmosphere 

 through the automatic brake valve. 



The locomotive brakes may be released by the independent 

 brake valve after they have been applied in service or emergency 

 by the automatic brake valve by moving the independent 

 brake valve to release position. This allows the air in the 

 application cylinder to escape through the application-cylinder 

 pipe and the independent brake valve. However, if the auto- 

 matic brake valve is in emergency position when releasing the 

 locomotive brakes through the independent brake valve, it will 

 be necessary to hold the independent brake valve in release 

 position in order to prevent the brakes from reapplying, because, 

 with the automatic brake valve in emergency position, main- 

 reservoir air will be supplied to the application cylinder through 

 the maintaining port n in the rotary valve of the automatic 

 brake valve. 



To graduate the release of the locomotive brakes through 

 the independent brake valve, the handle of this valve should 

 be moved to full-release position (or to running position, if 

 the automatic brake valve also is in running position) long 

 enough to reduce the pressure in the application cylinder the 

 desired amount, and then moved to lap position. As the 

 pressure in the application cylinder and chamber is reduced, 

 the greater pressure in the" exhaust-valve chamber will move 

 the application piston 10 and exhaust valve 16 to the left and 

 reduce the brake-cylinder pressure a trifle below the application- 

 cylinder pressure, when the application piston 10 and the 

 exhaust valve 16 will move to the right and close ports d and e 

 and retain the remaining pressure in the locomotive-brake 

 cylinders. 



PRESSURE-MAINTAINING FEATURE OF DISTRIBUTING 

 VALVE 



The pressure-maintaining feature of the distributing valve 

 is very valuable in connection with the ET equipment, for as 

 long as there is air pressure in the application cylinder of 

 the distributing valve, the same amount of pressure will be 



