. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . the past or the manwho repaired triple valves before the in-troduction of the test rack, or withoutmodern facilities merely filed-down theslide valve and seat a little, hunted up aring that would make a pretty fair fit inthe bushing, ground it for a few minutes—and then considered the triple valve readyfor service. This mav be correct in some, but not principally upon tightness of the slidevalve, graduating valve, check valve, triplepiston packing ring, the capacity of thefeed groove, freedom
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . the past or the manwho repaired triple valves before the in-troduction of the test rack, or withoutmodern facilities merely filed-down theslide valve and seat a little, hunted up aring that would make a pretty fair fit inthe bushing, ground it for a few minutes—and then considered the triple valve readyfor service. This mav be correct in some, but not principally upon tightness of the slidevalve, graduating valve, check valve, triplepiston packing ring, the capacity of thefeed groove, freedom from undue resist-ance to motion and leakage to the atmo-sphere, the following form of test wasusually applied. After the check valve and seat wascleaned or ground to a bearing it wastested by removing the drain plug fromthe check valve case and filling the caseabove with water, if no water appearsat the drain plug opening in a reasonablelength of time the valve was consideredtight, and was then bolted to the valvebody with emergency valve, spring, pistonand guide in their proper positions. The. WESTIXGIIOUSE TRIPLE \ TEST RACK. safety valve and graduated release the space in this issue will not per-mit of a complete description this veryimportant machine will be referred to inthe following issue. Triple Valve Tests. The triple valve testing machine, or testrack that is used in all up-to-date airbrake repair rooms is considered by airbrake men to be an absolute necessityeven if the air brake equipment is to bemaintained in only a reasonable, not tosay, a high, state of efficiency. There is no question but that theseopinions are correct and it is a wellknown fact that a triple valve that ap-plies and releases perfectly among 10,15, or 20 other brakes gives no assur-ance that it will do so when it is coupledwith 60 or 80 other brakes in a train ofcars, and such being the case it naturallyfollows that better workmanship and amore rigid and exacting test is requi
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