NO. 6 E T LOCOMOTIVE BRAKE 267 



A graduated independent application may be made by 

 admitting a certain amount of pressure to chamber g in the 

 distributing valve and then placing the independent brake valve 

 in lap position, continuing this as often as desired until a full 

 application is obtained. Each time the brake valve is lapped, 

 the distributing valve will assume independent lap position. 

 When a full independent application is obtained, there will be 

 a pressure of 45 Ib. in the application cylinder and the locomo- 

 tive brake cylinders, this being the pressure for which the C-6 

 reducing valve is set. When the equalizing valve SI and piston 

 26 are in release position, if the reducing valve is out of order or 

 improperly adjusted, the safety valve will prevent the applica- 

 tion-cylinder pressure rising above 68 Ib., the pressure for which 

 it is set, provided the independent brake valve is in slow-appli- 

 cation position; but if the independent brake valve is in quick- 

 application position, the larger ports in the brake valve will 

 supply air to the application cylinder faster than it can escape 

 through the safety valve; consequently, the brake-cylinder pres- 

 sure will be increased above the amount for which the safety 

 valve is set. 



Independent Release Position. If the equalizing piston 26 

 is in release position when the ^locomotive brakes are being 

 released by means of the independent brake valve, the movable 

 parts of the distributing valve will assume independent release 

 position, which is exactly the same as when the brakes are 

 released by the automatic brake valve. When the independent 

 brake valve is moved to release position, it allows air to flow 

 from the application chamber and cylinder to the atmosphere. 

 The greater pressure in the exhaust-valve chamber then moves 

 piston 10 to the left, carrying valves 5 and 16 with it. Valve 

 16 opens port d, and port /, through valve 16, registers with 

 port e. This allows air from the exhaust-valve chamber and 

 brake cylinders to escape to the atmosphere through the exhaust 

 port Ex. 



When the equalizing piston of the distributing valve is in 

 release position and the automatic brake valve is in running 

 position, the locomotive brakes can be released by placing the 

 independent brake valve in running position. Under these 

 circumstances, application-cylinder and application-chamber air 



