US263338A - And edwin smedley - Google Patents

Description

(No Model.) 3 Shets-Sheet 1 0. H. HUDSON & E. SMEDLEY.

VALVE FOR STEAM PUMPINGENGINES.

No. 263,338. Patented Aug. 29, 1882.

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(No Model.) 3 Sheets-Sheet 3. 0. H. HUDSON & E. SMEDLEY.

VALVE FOR STEAM PUMPING ENGINES.

No. 263,338. Patented Aug. 29, 1882.

CHARLES H. HUDSON,

or HINSDALE, ILLINOIS, AND EDWIN SMEDLEY, or

DUBUQUE, IOWA.

VALVE FOR STEAM PUMPING-ENGINES.

SPECIFICATION forming part of Letters Patent No. 263,338, dated August 29, 1882. Application filed November 1, 1881. (No model.)

To all whom it may concern:

Be it known that we, CHARLES H.HUDSON, of Hinsdale, in the county of Du Page, State oi'Illinois, and EDWIN SMEDLEY, of Dubuqne,

in the county ot'Dubuque and State of Iowa, have invented certain new and useful Improvements in Valves for Steam Pumping-Engines; and we do hereby declare the following to be a full, clear, and exact description of the invento tion, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters or figures of reference .marked thereon, which form a part of this specification.

Our invention relates to a special construction of the steam cylinder, valves, and other parts of a direct-actin g steam-pump, whereby live steam is not only kept constantly in the cylinder between the auxiliary valves at one end or the other of the cylinder, but in which there is no dead-center, the main valve being practically balanced and incapable of being forced against the cylinder-heads, because it is steam-cushioned, the pump always starting promptly when steam is put on, all as more particularly hereinafter described.

Figure 1 represents a longitudinal section, in the line a b of Fig. 3, of a steam-cylinder o constructed in accordance with our invention;

Fig. 2, a longitudinal section in the line 0 cl of Fig. 4; Fig. 3, a vertical transverse section in the line cf of Figs. 1 and 2, the end pieces and tappets being removed Fig. 4, an end view,

5 the cap or end piece being removed; Fig. 5, an elevation and a bottom and top view, re spectively, of the main valve and piston, showing the D-shaped valve on the main-valve piston Fig. 6, an elevation and a section of '40 the auxiliary valve; Fig. 7, an elevation of the auxiliary-valve stem.

A is the cylinder or casing, within which are the piston 13, the main piston or cylinder valve 0, and the auxiliary valves D D.

e e are ports or steam-passages for steam, connectingthe piston-chamberf with the main valve chest or chamber 9, as indicated by arrows in Fig. 1.

The auxiliary valves D D have a rigid stemconnection, h, between them, and which is common to both, and is acted upon by the in- Word movement of each of them; and this stem serves to keep them in position when the pump is at rest, and at all other times the pressure of steam keeps them in proper position. These valves D I) may be fixed upon or removably attached to the stem, and each has a slot or cavity, h, which is always in place over its port or ports. The stem It has a flat side, and

a screw, as, passing through the side of the case A, serves to prevent its turning the valves out of position and to limit their lengthwise motion. This stem may be made to drop into the valve-pieces D D, as seen in Fig. 2.

The tappets 2' i, projecting into the pistonchamberf, when respectively operated by the piston-head, actuate, by means of the levers j j, the tappets 7c to move alternately the auxiliary valves D D.

Fig. 3 shows the auxiliary-valve chamber at 70 the side of the -main-valve chamber, from which the steam is admitted through the port y. (See Figs. 2 and 3.) When the piston strikes a tappet 13 motion is transmitted to the auxiliary valve D, which opens it, and thus admits steam to the end of the main valve through the port or passage Z, and throws it. The instant the piston, by means of the tappet, opens the auxiliary valve, steam fromthe latter throws the piston-valve 0, thus forcing the piston, and with it the valve, to change position, and live steam from the opening m on top being permitted to pass through one of the transverse passages, 1 or 2, and through one of the longitudinal passages, e or c, steam is admitted to the other end of the piston or cylinder chamber], and the piston Bis forced in the opposite direction. The same movement of the auxiliary valve closes the steamport Z and opens the exhaust-port Z from the 0 back of the valve-piston at the other end of the auxiliary valve, and allows the steam behind the main-valve piston to escape through the passage E. (See Figs. 2 and 3.) The auxiliary valve remains in the position gained until the 5 piston reaches the other end of its stroke, and moves the tappets t" k, and thereby the auxiliary valve. Live steam is thus kept at one end or the other of the main-valve piston, holding it in place positively.

In order to prevent the pounding of the valve-piston, a set or adjusting pin or screw, to, is placed with its point or end in a small passage communicating with exhaust-portE, (see Fig. 3,) so arranged that the area or size of the exhaustopening may be enlarged or decreased until the back-pressure shall be just enough to cushion the piston, and at the same time there shall be no rebound.

The main-valve piston C has steam-passages 1 2 transversely through it, and the D-shaped valve-piece 3 inserted therein at its bottom, as shown, and with an open space, 4, at its top. A set-screw, 5, inserted through one side of the casing, enters a recess formed by a fiat portion of the valve-piston C, (see Fig. 3,) thus preventing the piston from turning axially and insuring the proper action of the piece 3 during the longitudinal movements of this piston. A steam -passage, it, below the auxiliary-valve chamber and a small steam-passage, zz', near each end of the main-valve chamberg open a communication between the same and the auxiliary-valve chamber. Steam being always in the chest or chamber containing the main or cylindrical valve 0, and the ports communicating directly with the eylinderf, containing the piston 13, motion is imparted to the piston, and thence, by means of the tappet k, to the small auxiliary valve 1)., admitting steam to thevalve O, which then starts at once, carrying with it its D-shaped valve, and thus steam is admitted first into one end and then into the other end of the chamber g. Thus there can be no deadeenter as long as steam turned on. The piston-valve which carries the main valve moves instantly as soon as the piston strikes the tappet, (k or k, as the case may be,) thus instantly reversing the motion ofthe valve-piston (J, and at the same time supplying it with a steam-cushion, and thereby preventing the piston from ever striking the cylinderhead.

In all other constructions with which we are familiar there is none that has not a dead-center,though we are aware that some do havelive steam constantly in the cylinder-chamber.

It will also be observed that by our peculiar combination of the D-valve with the large cylindrical or piston valve this D-shaped valve is practically a balanced valve, because it is so from the boiler is locked into the piston-valve that there is little or no downward pressure upon it.

A trough, Q, may connect the steam and water portions of the pump and extend under and parallel with the piston-rodp to catch any drippings and waste water and oil from the rod. (See Fig. 2.)

We claim- 1. The rigid stem h, serving to connect the valve-piecesD D, and provided with a fiat side, in combination with a set-screw, m, serving to prevent its turning, while allowing its proper lengthwise movements.

2. The steam-actuated piston-valve C,constructed as described-namely, ot' a solid cylinder throughout its main body, with a recess at the center of its top,with a cavity at the center of its bottom to receive the main valve having an exterior conformingto the circumference of the cylinder, and with the vertical passages 1 2 through the cylinder, as and for the purposes set forth.

3. The main valve, made as shown and described-that is, piano-convex in its cross-see tion and with parallel ends, and with a single cavity on its convex side, and adapted to fill a space made in the piston-valve for its reception, and provided with means to prevent its turning relatively to the piston-valve.

4. In combination, the piston-valve 0, being a solid cylinder throughout the main part ofits body, its piano-convex main valve conforming at all its sides thereto, exhaust-pipeE, and passage communicating therewith, and conicalpointed screw or pin 10, the combination being and operating as set forth.

5. In com bination, the auxiliary-valve stem h, removable auxiliary valves D D, and setscrew a;, with the piston-valve O, and its main valve constructed and applied thereto, as described, and with the steam ports or passages, all as and for the purposes set forth.

6. In combination,thepiston audits tappets, the auxiliary valves removably held on their rigid connectin g-stem and its tappets, the main valve constructed and applied to the pistonvalve, as set forth, and appropriate ports and passages, as and for the purpose described.

CHARLES H. HUDSON. EDWIN SMEDLEY.

Witnesses:

J. It. Fnosr, S. I. ADAMS.

ICC

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