Articoli correlati a Indicator Diagrams and engine and boiler testing
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...defective valve setting is discovered in any engine steps should be taken to remedy it, as it is prejudicial to economicial working, as well as tending to cause irregular turning. It has already been explained that with a simple slide valve the points in the distribution of the steam are very dependent on one other--that is to say, for instance, the point of cut-off cannot be altered without affecting one or more of the other points, and as the cut-off gets earlier, the points of exhaust opening and closing will get earlier. Further, it has been explained that, speaking generally, a slide valve should not be arranged to cut off earlier than at four-tenths or one-half of the stroke. CHAPTER VI. Where it is desired for economical reasons to cut off the supply of steam to the cylinder at an early period of the piston's stroke, it is usual to adopt some form of compound valve--that is, one valve working on the top of the other; or instead of this some arrangement in which separate valves are used to regulate the steam supply and the exhaust. A very common form of the first-mentioned arrangement is that known as Meyer's, which consists of a flat valve A, fig. 70, having its back face planed as well as the front face. Two flat plates work on the back of this valve, and the spindle connecting them has right and left handed screws on it, so that the distance between the plates may be regulated for the purpose of altering the cut-off. In designing such a valve the main valve should be arranged specially with a view of getting suitable compression and exhaust opening; after this the expansion plates should be proportioned to give the requisite range of cut-off. A very prevalent fault with this type of valve gear is that the main valve has too little lap on the steam ...
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