A treatise on the steam engine : historical, practical, and descriptive by Farey John 1766-1826

Author:Farey, John, 1766-1826
Language: eng
Format: epub, pdf
Tags: Steam-engines, Steam-engines
Publisher: London : Printed for Longman, Rees, Orme, Brown and Green
Published: 1827-03-25T05:00:00+00:00

The catch which is to retain the handle s in that position, is so connected with the other catch which retains the handle 3, that, in the act of latching the handle s, the other handle 3 is released from its catch, and then it falls by its weight, and suddenly opens the equilibrium-valve e.

Action during the returning stroke. Let us now consider the position of the engine. The middle handle s will be held down by its catch or detent, so as to keep the exhausting-valve i shut; the handle r of the expansion-valve b, is also kept down by the same chock 1, which kept it shut during the latter half of the descent of the piston. Under these circumstances the piston is at liberty to rise by the action of the counter-weight M, because the opening of the equilibrium-valve e has established a free communication between the top and bottom of the cylinder, so that the,steam in the top of the cylinder can flow through the pipe </, and enter into the bottom of the cylinder, as fast as ever the piston is drawn up by the action of the counter-weight.

When the piston has thus risen about half way to the top of the cylinder, the chock 1 in the plug, quits the expansion handle r; but this handle cannot yet be thrown up by its weight, so as to open the upper valve, because its catch keeps it down until the piston arrives nearly at the top of the cylinder, as in the figure ; a third chock ^, which is fixed to the plug /, then raises up the lower handle 3, and closes the equilibrium-valve e; and when the piston is quite up, another small pin in the plug releases those catches which detain the other two handles r and s ; consequently the weights of those handles cause them to rise up, as in the figure, so as to open the exhausting-valve «, and injection-valve7, and the expansion-valve ^, immediately after the equilibrium-valve e is shut.

Repetition of the 'working stroke. The steam from the boiler is now admitted to press upon the upper surface of the piston, whilst the steam from the lower part of the cylinder, beneath the piston, rushes into the condenser, where, being met by the cold injection water, it is condensed, and a vacuum being formed in the lower part of the cylinder, the steam presses down the piston to make another stroke.

At one-half of the descent, the chock 1 of the plug depresses and holds down the upper handle r, as before, to close and keep the expansion-valve b shut ; and when the piston has arrived at the bottom, the plug presses down the middle handle 5, to shut the injection and the exhausting-valves ; and in catching, it disengages the catch of the lower handle 3, and the weight thereof opens the equilibrium-valve /.

The piston then rises by the counter-weight, and when at the top of

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