214 TRIPLE VALVES 



It will be noticed that port e in the cylinder-cap end leads to 

 port e in the check- valve-case end; also, that the ports a in the 

 auxiliary-reservoir end lead to the ports a in the check- valve-case 

 end. The ports a connect with corresponding ports in the brake- 

 cylinder head and convey brake-pipe air to the space under 

 the check- valve 15, thence through port e and passage G to 

 chamber H. Port C in the auxiliary-reservoir end connects 

 with a port in the brake-cylinder head that leads into the brake 

 cylinder. Port C leads from the auxiliary-reservoir end of the 

 triple valve to chamber X, and the ports r in the slide-valve 

 seat lead into port C; hence all air entering in the brake cylinder 

 through the triple valve must pass through port C. Port p 

 in the auxiliary-reservoir end leads to port p in the slide-valve 

 seat and connects with a port in the brake-cylinder head that 

 leads to the atmosphere. Port x in the auxiliary-reservoir end 

 divides, one branch leading to port x in the slide-valve seat and 

 the other branch leading to chamber x back of the by-pass 

 valve. Also, port x connects with a port in the brake-cylin- 

 der head that leads to the supplementary-reservoir connection. 

 Port c in the slide-valve seat leads to the chamber back of the 

 by-pass piston. Port g, located in the upper part of the slide- 

 valve bushing, is used to supply auxiliary-reservoir pressure 

 to chamber /, in front of the by-pass valve, and through port 

 h to the chamber in front of the by-pass piston. Port y in the 

 check- valve-case end leads to port y in the slide-valve seat; 

 also, it connects with a port in the check- valve case 13 that 

 leads to chamber F, between the emergency valve and the 

 check-valve. Port t leads from the slide-valve seat to the 

 chamber above the emergency piston. Port b in the slide-valve 

 seat leads through the triple- valve body to the chamber below 

 the safety valve. In most of the illustrations, port b is indi- 

 cated as being but one port, whereas, there is one port b in the 

 slide-valve seat and two ports extending from the outer surface 

 of the slide-valve bushing to the chamber below the safety 

 valve. The only reason for having the two ports b is that it is 

 desirable to drill the ports and the thickness of the metal in 

 the triple-valve body will not permit of a single drill of suit- 

 able size to be used. As the ports b are drilled, the drilling 

 must naturally commence at the check-valve-case face of the 



