. Science of railways . s of the valve. The valvewill then fit tightly on the valve shell. If no lathe isat hand then grind the valve proper on a perfectly flatsurface of iron or steel, until its two bearings areexactly on a plane and with good, smooth surfaces;then take the shell and grind its seats in precisely thesame manner; rinse both parts in water and puttogether, and the valve will be found to be tight; toascertain when the bearings are on the same plane,use a good steel straight edge. Do not grind the valveto its seats on the shell by grinding them together, butgrind each part separat
. Science of railways . s of the valve. The valvewill then fit tightly on the valve shell. If no lathe isat hand then grind the valve proper on a perfectly flatsurface of iron or steel, until its two bearings areexactly on a plane and with good, smooth surfaces;then take the shell and grind its seats in precisely thesame manner; rinse both parts in water and puttogether, and the valve will be found to be tight; toascertain when the bearings are on the same plane,use a good steel straight edge. Do not grind the valveto its seats on the shell by grinding them together, butgrind each part separately, as above stated. Other types of Crosby plain and muffled pop safetyvalves are shown in the four next succeeding engrav-ings. Figs. 9 and 11, both sectional views, also show^the lever with which these valves are supphed w^henso desired. It is quite customary to supply a capwhich may be locked over adjusting nut (L), Fig. 7,so that no one without a key can alter the adjustmentof the valves. 234 LOCOMOTIVE
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