US304974A - strong - Google Patents

Description

2 Sheets-Sheet 1.

Patented Sept. 9, 1884.

G. S. STRONG.

VALVE FR STEAM ENGINES.

(No Model.)

2 sheets-sheen' 2.

G. S. STRONG.

VALVE YEOE ETEEM ENGINES.

(No Model.)

,974. Patented Sept. 9, 1884.

M, WENEN N. Evans Phono-umol;

E me m W UNirnD STATES Afri-Nr ptica.

GEORGE S. STRONG, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JOHN T. MORRIS, TRUSTEE, OF SAME PLACE.

VALVE FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 304,974, dated September 9, 1884.

Application filed February 4, 1584. (No model) lo (1H whom it may concern:

Beit known that I, GEORGE S. STRONG, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Valves for Steam- Engines, of which the following is 'a specification.

My invention consists of the combination, substantially as described and claimed hereinafter, of the cylinder and ports of a steam-engine, asteam and exhaust valve, and a fixed partition-plate between the two, with passages by which live steam is directed to the opposite ends only of the said steam-valve.

In the accompanying drawings, Figure l, Sheet l, is a transverse vertical section on the line l 2, Fig. 2, of one ofthe cylinders of a locomotive-engine illustrating my improve-` ments; Fig. 2, a sectional plan on the line 34, Fig. l; and Fig. 3, Sheet 2, a longitudinal section on the line 5 (i, Fig. 2.

A is the cylinder, provided at the rear end with the cover B, and at the front end with a cover, D, having the usual stuffing-box for the rod a of t-he piston E.

There are two slide-valves, G and H, of the character described hereinafter; but it should be stated here that so far as the construction of the valves, viewed apart from their special arrangement in respect to the other parts of the device is concerned, it is not of my invention. The cylinder has steam-ports b b and exhaust port d, the latter communicating, through a passage, d', with the curved pipe F, which communicates with the usual draft-pipe of the locomotive. It will be observed on referring to Fig. l that the exhaust-passage d is not bounded at any points by the steamcylinder, but is isolated therefrom by a partition, w, forming aY continuation of the lower portion of the exhaust-pipe F, between which partition and the cylinder A isa space, e, communicating with the space e/ between thensual lagging, f, and the said cylinder, an arrangement by which the latter is isolated from the exhaust-passage, and is consequently uninfiuenced by the temperature of the exhaust-steam. The lower face of' the valve H is adapted to the face m, formed on the cylinder, and has an extended central opening, h., and two ports, ifi', the upper surface of this valve being arranged to bear against the under side of a partitionextended central opening, a, and its upper face is arranged to bear against the under side of the cover-plate I.

There are two chests, M M', the lower chest, M, of which thcpartition-plate XV in the present instance forms a part, having its bearings on an extension of the valve-face x, and the upper chest, M, having its bearings on the lower chest, and both chests being secured to the cylinder. The chest M is extended laterally, so as to have an additional bearing at f, and so as to form a passage, T, which communicates at two points, y y, Fig. 2, with curved passages, (indicated by dotted lines,) which passages terminate at the steam-inlet w', the said passageT communicating with the interior of the chest M at opposite ends of the valve G, which, when the engine is in operation, are always exposed to the pressure of live steam. Each valve is composed of two plates, with strips let into both plates, and preventing the steam from entering between them, suitable springs intervening between the said plates, so as to maintainboth in conta-ct` with their seats. This construction of valve forms no part of my invention, as it has been heretofore used.

To each valve is fitted a yoke, r, forming part of the spindles K K.

The valves are combined with any of the well-known mechanisms by which jan invariable full stroke is imparted to the valveH and a variable vstroke to the valve G, or in some cases where an unchangeable cut-off is required, the valve G may have an unvarying movement. It will be seen that both valves are balanced-that there is no pressure of steam on the top of the valve-that the valve G is in no way influenced as regards its movements by the steam, as the pressure of the same on both ends is alike-and that the valve H can not be influenced by the live steam, as the opening h extends entirely through it,

It will be unnecessary to introduce aminute description ofthe movements of the two valves, as they will be readily understood by those familiar with inventions of this class. It will IOO suliioe i'o remark that the va'ly'e H is practically an exhausbvalve solely, the valve G he ing` a steam out-off valve, which performs the duty of admitting steam to the two ports I) b ofthe cylinder7 the valve G and the ports m m determining ihisintroduotion ofsteam7 and the ports t' t" being always in such a position that,no matter which of the two polis 'In m 'be opened by the valve G, there will be a free passage for the steam through a port, 1', of the lower'valve to a cylindenpoi't.

I Claim as my invention- The wmbination oi the cylinder' and its ports, the exhaust-valve H, iixed partitionplate Vx', and steam-valve G, with passages by which live steam is directed to the opposite ends only of the said steam-valve, substantially as set forth.

In testimony whereof I have sign ed iny naine to this specification inthe presence of two 2o subscribing Witnesses.

GEO. S. STR-ONG.

lVitnesses:

JOHN E. linnnn, HARRY SMTTH.

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