US394930A - Valve for steam-engines - Google Patents

Description

(No Model.)

l J. P. LISK.-

VALVE FOB. STEAM ENGINES.

Patented Dec. 18, 1888..

Inl/en far;

s.. c l

NiTnD STATES PATENT Orricn.

JOSEPH P. LISK, OF MAOEDON, ASSIGNOR OF TlVO-THIRDS TO GILBERT F. EVERSON AND LOUIS P. EN lEL, OF PALMYRA, NEIV YORK.

VALVE FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 394,930, dated December 18, 1888.

l Application filed May 12, 1888. Serial No. 273,650. (No model.)

To @ZZ 'whom 1725 may concern:

Be it known that I, JOSEPH P. LIsK, of Macedon, in the county of lVayne and State of `bew York, have invented a new and useful Improvement inValves for Steam-Engin es, which improvement is fully set forth in the following speeiication and shown in the accompanying drawings.

My invention relates to the manner of letting steam into and out of the steam-cylinders; and the object is to construct the valve and ports in such a manner that steam will be admitted from the steam-chest into the cylinder through two independent openings at each end of the cylinder and out through the same in the act of exhausting, the valve being perfectly balanced as to the action of steam upon it.

The invention is hereinafter more :fully described, and particularly pointed out in the claim.

Referring to the drawing, Figure l is a view at the end of the cylinder, the latter, with the steam-chest, being transversely sectioned, as on the line in Fig. 2 and viewed as indicated by the arrow pointed thereon; Fig. 2, a longitudinal section ot' the cylinder and steam-chest, taken as either on the upper or lower dot-ted line y y in Fig. 'l and viewed as indicated4 by either of the arrows pointed on said respective lines, both views being exactly alike; Fig S, a transverse section ol' the parts, taken on the dotted line ,e in Fi 2 and viewed in the same direction as lilig. l; Fig. i, a longitudinal section of the steam-chest, taken on the dotted line fr in Fig. l and viewed as indicated by the arrow pointed on said line; Fig. 5, aview of one of the equal faces of the valve, a part being broken away; and Fig. il, a view taken at the end of the valve.

Referring to the parts shown, A is the cylinder of a steam-engine, and l5 the steamchest. I

O is a valve within the steam-chest, and a the valve-rod. The steam-chest contains within it two val ve-seats, l) l), both alike and opposite each other, as shown, said valve-seats each bei ng pierced by inlet and exhaustports c c and (l, substantially of common form. The four inlct-tmenings of the two valve-seats communicate with the interior of the cylinder through four separate ports, e e, by means of side pipes, f f. The exhaust-port in each valve-seat leads into a passage, g, which passages unite at h in a common exhaust or exit opening for the cylinder.

The valve is formed with two similar oppositely-turned faces, 'i i, to meet the respective valve-seats l) b to open and close the various ports, as hereinafter more fully explained. It will be seen from Fig. 4 that two inlet-openings for live steam to one end of the cylinder are made simultaneously by the valve, the two currents of steam liowing therein entering the same end of the cylinder, but upon opposite sides thereof. It will also be seen that the exhaust-steam from the opposite end of the cylinder has two passages out from the cylinder open to it at the same time by the valve. By this construction twice the area of opening is formed for the inflow of steam to either end of the cylinder for the same amount of travel of the valve in making either its forward or backward movement. This is important, for the shorter the travel of the valve the less is the power of the engine taxed to drive it.

Both of the workin gfaces of the valve being equal and equally acted upon bythe steam at any given moment, the valve is perfectly ballanced so far as the action of the steam upon it is concerned. I make the valve in two equal parts, 7.1, and bolt them together, as shown, back to back. The valve-rod is provided with a longitudinal conical piece, Z, litted to a conical opening formed one-half in each of said parts 1.1 k of the valve. This cone acts as a spreader for the two halves of the valve, by means of which they maybe set apart to meet more closely the opposing' valveseats b l), to compensate for the wear of the same. Collars a "a are secured to the valverod by set-screws or other similar and wellknown means-one on each side of the valve. One of these collars bears against. the large end of the cone, while the other one bears directly against the side of the valve. By this means the cone is held relatively to place when the halves of the valve havebeen properly adjusted to the valve-seats.

The valve-rod passes through a stufing-box, D, ot' common form in the side of the steam- IOO Chest, and the live steam l'roni the boilers enters the Steam-chest through an opening, E, Conveniently formed and of the usual kind.

The opening 7L for the exit of the steam from The cylinder is formed in a cap or dome, F, secured To the open sido ol' the steam-chest. To this Cap the exhaust-pipe is Secured in the usual manner.

lVhat I claim as 1n y invention is" A steam-ongine formed with similar parallel and opposing' Valve-Seats, each having inlet-ports connnunicatingl with the interior of the cylinder, and an exhaust-port, in Combination with a valve for the seats, a valverod passing through the valve, the latter bei ng divided on a plane parallel With the Valveseats and on tho axis of tho rod and formed with a longitudinal conical oavity,onel1alf in oaoh, a conical Sleeve shorter than the valve in said cavity upon the rod, and retainingoollars on the rod on each Sido of the valve, Substantially as shown.

J OSEPH P. LISK. \\"ilinossos:

E. B. WHITMORE, M. L. MCDERMOTT.

Images