TRIPLE VALVES 229 



point at which the new-equipment train had stopped, its speed 

 was 32 mi. per hr. and it had a wrecking energy of 35,810,000 

 ft.-lb. It passed the point at which the new-, or LN-, equip- 

 ment train stopped, 7.5 sec. before the new-equipment train 

 reached that point. It was running at over 20 mi. per hr. and 

 had a wrecking energy of over 14,000,000 ft.-lb. at the instant 

 the new-equipment train stopped. It ran over 100 ft. after 

 the other train stopped. The total work done, in foot-pounds 

 per second, was 3,014.5 with the new brake and 2,442 with the 

 old. The work per brake shoe was 27 ft.-T. per sec. with the 

 new and 21 ft.-T. per sec. with the old. 



CLEANING TRIPLE VALVES 



Triple valves should be inspected and thoroughly cleaned 

 at least once every 3 mo. The main piston and attached 

 valves should be immersed in kerosene while cleaning the 

 other parts. Remove and examine the emergency parts, then 

 clean and replace them without oiling, as they are seldom 

 used and the oil will only serve to collect dirt. The slide valve 

 and main-piston chamber should be cleaned with kerosene and 

 a piece of cloth, and care should be taken not to leave any 

 lint clinging to the parts. All the grooves and ports should 

 be thoroughly cleaned by means of a pointed, hardwood stick 

 to remove the gum from the grooves. Give the triple-piston 

 chamber and slide-valve seat a light coat of oil. Then remove 

 the parts from the kerosene, and clean the slide valve and grad- 

 uating valve. The main-piston packing ring should be worked 

 around until all the dirt is removed from it; it should not be 

 removed from the piston unless a new ring is to be applied. 

 Care should be taken to wipe all parts perfectly dry before 

 lubricating them, because, if any kerosene is left in the triple 

 or on any of the parts, it will tend to destroy the lubricating 

 qualities of the lubricant. Also, care should be taken not to 

 apply too much oil or grease, as practical experience has shown 

 this to be one of the chief causes for undesired quick action. 

 The face of the slide valve and graduating valve and the main- 

 piston packing ring should be lightly lubricated with oil 



