. American engineer and railroad journal . body, the latter being elliptical in cross section. Thisarrangement permits very short and direct steam ports and actsthe same as an ordinary slide valve, being set with the samelead and given the same lap as would be used with the custom-ary construction. In addition to this main valve, which is setat an angle so as to permit room, there is an auxiliary compres-sion valve, which is of the piston or plug type and is operatedfrom a separate connection on the combination lever. This com-pression valve simply opens and closes a passage in the wallbetween
. American engineer and railroad journal . body, the latter being elliptical in cross section. Thisarrangement permits very short and direct steam ports and actsthe same as an ordinary slide valve, being set with the samelead and given the same lap as would be used with the custom-ary construction. In addition to this main valve, which is setat an angle so as to permit room, there is an auxiliary compres-sion valve, which is of the piston or plug type and is operatedfrom a separate connection on the combination lever. This com-pression valve simply opens and closes a passage in the wallbetween the cylinder steam ports and the exhaust passage. Itremains open after the exhaust closure of the main valve andpermits the steam to escape from the cylinders to practically theend of the stroke. The cylinders are so constructed as to givetlie minimum amount of clearance, permitting the exhaust closureto be carried up to a very late point in the stroke and still givesufficient compression to avoid shock. The compression valves #1fc 1 ( ^. .\RR.\NCFMENT OF \LVE GE.^R ON MEXICAN INTESX.\TIONAL 2-6-6-2 TYPE LOCOMOTIVE. Locomotive Works and are designated as Class H in the rail- have no other duty than to simply open this passage to the ex-road companys classification. They are designed for service on haust at the same time that the main valve opens its exhausta line having curves of 21 degs. and grades of three per cent. and to remain open as just explained. The compression valve 240 AMERICAN ENGINEER AND RAILROAD JOURNAL June. rJll. in this case is sVi in- diameter and is packed with broad castiron rings which have leakage grooves turned in them. Refer-ence to the illustration will show the arrangeinent of the gear asfitted to operate both valves properly and of the high pressurecylinder castings. VALVES. Kind Hobart-Alf ree Greatest travel 6 in. Outside lap Ifi in. Inside clearance, H. P 7/16 in. Inside clearance, L. P % in. Exhau st clearance, compression valve ^ ^
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
