File:Porter-Allen cylinder and valves, sectioned (New Catechism of the Steam Engine, 1904).jpg

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Fig. 83 Horizontal section of cylinder through steam and exhaust valves

Porter-Allen engines were the first truly high-speed steam engines. They combined Allen's design of balanced slide valves and trip valvegear with Fink's stationary link to adjust cut-off under the control of Porter's high-speed governor. Like the Corliss, they were four-valve engines with two separate admission and exhaust valves, each operated and adjustable independently.
Source Scan from Hawkins (b.1833), Nehemiah (1904 edition of 1897 book. Originally published in 1897, later expanded to cover internal combustion engines.) New Catechism of the Steam Engine, Category:New York: Theo Audel, pp. fig. 83
Author Andy Dingley (scanner)
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current17:16, 26 June 2009Thumbnail for version as of 17:16, 26 June 20091,164 × 822 (182 KB)Andy Dingley (talk | contribs){{Scans from 'New Catechism of the Steam Engine', 1904}} <!--{{ImageUpload|basic}}-->

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