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The slide valve practically explained; Embracing simple and complete practical demonstrations of the operation of each element in a slide-valve ... by examples carefully selected from - Softcover
Synopsis
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. 1880 Excerpt: ...with the iron surface of the steam chest face or valve seat face, and will amount, in a small valve, to, say 25 inches, which, multiplied by the atmospheric pressure, say 15 lbs., would give 875 lbs. in addition to the weight of the valve as the power necessary to lift the valve from its seat. As a practical fact, however, it docs not matter how perfectly any valve, when new, may fit to its seat; one month's wear will so entirely destroy the truth of the surfaces, that it may be lifted from its seat against the atmospheric pressure without the employment of 1 lb. per square inch more than that due to the weight of the valve; indeed, it is not found in practice to require anything more than the simple weight of the valve. There can be but one explanation of this well-known practical fact, which is, that the valve does not fit sufficiently closely to its seal to exclude a thin film of air which acts to counterbalance the pressure on the back of the valve. That such a film of air may exist without affecting the practical tightness of the valve is capable of indisputable demonstration. Thus, take two truly surfaced plates, and, after carefully cleaning them, lower one vertically upon the other, and it will be found to float upon the other, gliding about wilh extraordinary ease. Then lift the top plate, and it will suspend the bottom one from the partial vacuum between the two surfaces. CONDITIONS UNDER WHICH A SLIDE VALVE OPERATES. The conditions under which a slide valve operates while actually at work are widely different from those existing when it is at rest. First, as the boiler pressure fluctuates the temperature of the valve varies, causing the valve to expand or contract as the temperature increases or falls, and the irregular shape of the valve prevent...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 1151448893
- ISBN 13 9781151448897
- BindingPaperback
- LanguageEnglish
- Number of pages34
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