Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . The functions that a slide valve must perform injorder that the engine may do efficient work are five inmumber, and they are as follows: First, it must admitsteam into one end only of the cylinder at the sametime. Second, it must cover the steam ports so as notto permit the passage of live steam through both steamports at the same time. Third, it must allow thesteam to escage from one end of the cylinder before itis admitted at the oth
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Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives . The functions that a slide valve must perform injorder that the engine may do efficient work are five inmumber, and they are as follows: First, it must admitsteam into one end only of the cylinder at the sametime. Second, it must cover the steam ports so as notto permit the passage of live steam through both steamports at the same time. Third, it must allow thesteam to escage from one end of the cylinder before itis admitted at the other end, so as to give the steamthat is to be exhausted time to escape before the pis-ton commences the return stroke. Fourth, it mustnot permit live steam to enter the exhaust port directfrom the steam chest. Fifth, it must close each steamport on the steam side before it is opened on the I2C LOCOMOTIVE ENGINEERING exhaust side; this is for the purpose of utilizing theexpansive force of the steam. Figs- S3 to 58> inclusive, show the general construe-, tion of the D slide valve and illustrate the variouspositions assumed by it during one stroke. Fig. 53. Figure 53 shows the valve in its central position and explains the meaning of the word lap. Outside lap, oftenreferred to as steam lap, is the distance that the edge 1of the valve overlaps the steam ports when it standscentral or at mid-travel, and is that portion of the !