276 PC PASSENGER-BRAKE EQUIPMENT 



to service position is then built up as the brake-pipe reduction 

 progresses. 



Quick rise in brake-cylinder pressure, which is provided for 

 by prompt movement of the parts of the control valve and by 

 direct, unrestricted passages from the reservoirs to the brake 

 cylinders during applications. 



Uniformity and maintenance of brake-cylinder pressure dur- 

 ing service stops, which are provided for as in the distributing 

 valve of the ET equipment. 



Predetermined limiting of the service braking power, which is 

 freed by the equalization of the pressures in the application 

 chamber and the pressure chamber of the control valve. This 

 feature does away with the necessity of the safety-valve feature 

 of the ET and other equipments. 



Automatic emergency application on depletion of brake-pipe 

 pressure, which is insured automatically by the movement of 

 the parts of the control valve to emergency position just as 

 soon as the brake-pipe reduction becomes less than the pres- 

 sure at which the pressure chamber and the reduction-limiting 

 chamber equalize. 



Full emergency braking power at any time; the operation of 

 the emergency and quick-action parts of the control valve is 

 such as to give the full emergency braking power whenever 

 the parts move to emergency position. The parts can be 

 moved to emergency position at any time by making an emer- 

 gency application either with the brake valve or the conductor's 

 valve, or by other means; hence, full emergency braking power 

 can be obtained at any time, even after a full service applica- 

 tion has been made. 



Separate service and emergency features, thus giving the neces- 

 sary flexibility for service applications without interfering in 

 the slightest with the emergency features of the equipment. 



A law total leverage ratio and greater brake efficiency, due to 

 the use of two brake cylinders on each car; also, this arrange- 

 ment gives a higher service equalization pressure. 



Less tendency to undesired light applications of the brake, 

 because the apparatus is less sensitive than others to the 

 light fluctuations of brake-pipe pressure; this insures against 

 brakes creeping on and dragging. 



