. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . sion pistonvalves. The lettering indicates the namesof the various parts. .A indicating thevalve, R the valve stem. C the coml)ina-tion lever, D the crosshead link, E theradius rod. F the reverse shaft. G thelifting link. H the reach rod. K the re- 78 RAILWAY AND LOCOMOTIVE ENGINEERING. March. 1917. verse Itvcr, L the oscillating or reverselink, M the eccentric rod, N the eccentriccrank. The reverse lever is in the mid-dle position, with the link block in thecenter of the link. In the adjustm
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . sion pistonvalves. The lettering indicates the namesof the various parts. .A indicating thevalve, R the valve stem. C the coml)ina-tion lever, D the crosshead link, E theradius rod. F the reverse shaft. G thelifting link. H the reach rod. K the re- 78 RAILWAY AND LOCOMOTIVE ENGINEERING. March. 1917. verse Itvcr, L the oscillating or reverselink, M the eccentric rod, N the eccentriccrank. The reverse lever is in the mid-dle position, with the link block in thecenter of the link. In the adjustment of the gear, when ir-regularities are noted in the opening ofthe valves when running ahead, if the ec-centric rod is shortened the valve ! while it would be impossible to lay downrules to cover ever>- condition that mightarise, the accidents may generally he di-vided into two classes: those in which itis not necessary, and those in which it isnecessary to block the valve. The lirst class of accidents includes only thriif cases in which it is not necessary to \vn the main rod. The valve must. moved ahead in a ratio corresponding tothe throw of the eccentric to the travelof the valve, or in the figures referredto, 12 to SA, so that the valve will bemoved a little less than half of the varia-tion made on the eccentric rod. If theeccentric rod is lengthened the valve ismoved back. In the backward motionwith the link block in the top of the linkthe opposite effect will be produced inlengthening or shortening the eccentricrod. In the case of alterations made onthe radius rod the same variation will bemade on the position of the valve, regard-less of whether the link block is above orbelow the center of the link. Changesnecessary will quickly suggest themselvesto the experienced mechanic, but organicdefects in the Walschaerts valve gear arenot easily remedied, and some authoritiesclaim that in case of any important varia-tion from the exact action or position ofthe valves to ad
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
