File:American engineer and railroad journal (1893) (14759192542).jpg

Identifier: americanengineer68newy (find matches)
Title: American engineer and railroad journal
Year: 1893 (1890s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York : M.N. Forney
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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ve arrangement. Steam en-ters at A, passes through the throttle-valve B, through Cand Dto the belt E, extending entirely around the cylinder and hav-ing openings shown by the dotted lines up to the valve facebelow F. The valve is an annular casting with a series ofstalls N (see fig. 4) leading in from the inner passageway F.At the upper side the valve carries the teeth of a spur-gear, A,that mesh in with those of the pinion </, which is keyed to avertical valve-rod. This valve-rod is given a continuousrotary motion by means of a worm 1 on the main shaft, thatdrives a wheel on the vertical valve-rod already alluded to.This motion is necessarily very much slower than that of theengine, and even this speed is still further reduced by the ratioexisting between the gear Aand the pinion ./. The speed ofthe valve is such that the stalls A come into line with and openthe ports G in the valve-seat at the proper time for the admis-sion of the steam between the pistons. The valve, rotating in
Text Appearing After Image:
Vol. LXVIII, No. io.) AND RAILROAD JOURNAL. 461 one direction, is an admission valve only. The exhaust is obtained by giving the pistons such a stroke that at the extremeouter ends the ports IIHal the upper and lower ends of thecylinder are uncovered, allowing the steam to exhaust intothe chamber formed by the spherical casing, from which itescapes to the atmosphere or condenser through the 2-in. pipeat the left of fig. 2, as indicated by the arrow. The regulation of the speed is obtained by means of a throt-tling governor, the construction of whose valve G and otherdetails is very clearly shown by fig. 1. The fly-wheel carriesa pair of bell-cranks, on the short arms of which are theweights. As they move outward under the influence of cen-trifugal force the long arms are drawn in, acting, in turn,upon the exterior bell-crank in a manner that is very readilytraced through to the valve by reference to the engraving. The similarity to the Westinghouse engine once more ap-pears in the dip

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