[Download] "Scientific American Supplement, No. 787, January 31, 1891" by Various Authors # Book PDF Kindle ePub Free

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eBook details

• Title: Scientific American Supplement, No. 787, January 31, 1891
• Author : Various Authors
• Release Date : January 01, 2012
• Genre: Antiques & Collectibles,Books,Lifestyle & Home,
• Pages : * pages
• Size : 1689 KB

Description

In considering the slide valve in its simple form with or without lap, we find there are certain limitations to its use as a valve that would give the best results. The limitation of most importance is that its construction will not allow of the proper cut off to obtain all the benefits of expansion without hindering the perfect action of the valve in other particulars. At this economical cut off the opening of the steam port is very little and very narrow, and although this is attempted to be overcome by exceedingly wide ports, sixteen inches in width in many cases in locomotive work, this great width adds largely to the unbalanced area of the valve.

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