US25794A - Nathan c - Google Patents

Description

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UNTTED sTATEs PATENT orrioia NATHAN C. TRAVIS, OF AIJION, ILLINOIS, ASSIGNOR TO HIMSELF, NATHAN JOHNSON, AND R. EMERSON, OF SAME PLAGE.

REGULATOR-VALVE FOR STEAM-ENGINES.

` Speccaton forming part of Letters Patent No. 25,794, dated October 11, 1859; Reissued September To @ZZ whom it may concern:

Be it known that I, NATHAN C. TRAVIS, of Alton, in the county of Madison and State of Illinois, have invented a new and Improved Balanced Regulating and StopA Valve for Steam-Engines; and I do4 hereby declaie that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specication, said drawing represent-ing a vertical section of my improved valve with governor and stopscrew applied.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

A, is the valve box of upright cylindrical form having a closed bottom and a close cover B, fitted with a stuffing box c.

L, and c, are the two valve seats of the form commonly usedfor puppet valves one at or near the bottom of the box and the other some distance above.

el, (Z, are the openings which may be of square or rhombic shape, arranged with their angles at top and bottom in what is commonly termed diamond form, said openings being two or more iii number arranged at equal distances apart.

C, is tli-e annular steam casing surrounding the lower part of the valve box A, and ooinmuiiicating therewith by means of the openings CZ, CZ. This oasiiig forms a base to the valve box and has an outlet g, in the bottom surrounded by a ianch f, by which it is to be bolted to the steam chest or steam pipe of the engine. lAbove the upper valve seat is the inlet of the valve box, to which is bolted the steam pipe from the boiler.

D, is the valve consisting of a short cylindrical tube having a narrow flaiich c, around its upper part and having its lower extremity and the lower face of its fiaiicli c, beveled like the faces of ordinary puppet valves and fitted to the two seats Z), c, said seats and faces being at such distances apart that the valve may tit steam tight into both The cylindrical portion of the valve below the flanch c, is tted to work snugly but easily within the portion of the interior of the box between the valve seats. rlie valve has a bridge piece t', across its top, connecting it with the stem j, which works through the stutiing box c, and which has a screw thread j, out on its upper part to tit the screwed interiorof a socket 7c, which is fast on the lower end of' the governor rod Z.

E, is the pillar which supports the governor supported by a bridge piece F, on the cover B, of the valve box directly over the center of the valve.

G, is the mainspindle of the governor made hollow and fitted to rotate within the pillar E.

I-I, H, are the ball arms attached to the spindle by pins m, m, and having their upper or inner extremities fitted into a groove a, in the head of the rod Z, which is suspended therefrom within the main spindle and which is prevented turning with the governor, though permitted to work up and down with the movement of the balls by means of au arm p, which projects from its socket 7c, into a vertical groove g, provided iii the bridge piece F.

I, is the driving shaft of the governor geared with the main spindle G, by a pair of bevel gears r, s.

J, is a hand wheel on the valve stem for adjusting or closing the valve.

The valve is raised and lowered and thereby caused to uncover a greater or less portion of the openings cl, d, of the valve box by the changes in the plane of revolution of the governor balls consequent upon increased or diminished velocity. rIhe steam entering the box at h, passes down through the interior of the valve and under the bottom thereof through the openings el, d, into the hollow base or casing C, and thence through the outlet g, to the steam chest of the engine. As the valve is exposed on all opposite surfaces alike, to the steam, it is perfectly balanced and therefore works with the greatest freedom. The diamond form of the openings causes the movement of the valve up or down from the position in which the openings (Z, d, are severally half uncovered to produce at rst a rapid increase or dimiiiution of the movement and causes such increase or diminution to be less rapid as it progresses, thereby making the governor act very quickly on the engine and yet preventing its action being followed by an unsteady motion of the englne.

When it is desired to stop the engine, the valve, though connected with the governor, may be screwed down like an ordinary stop valve, by turning the Wheel J, in a direction to make the screw thread on the stem Work down Within the screw of the socket 7s. When the Valve is closed in its two seats the Steam is shut off from the openings d, el; and the two seats and valve faces are necessary for this purpose.

It will be observed that the lower end of the Valve box is suspended Within the easing C, and is entirely independent thereof, whereby the flow and entrance of the steam is not impeded by any braces or other obstacle, but the interior of the casing is left entirely open and free. rIhe Valve box be! ing thus independently suspended Within the casing C, the latter may be at any time (yn) groove (q) and band Wheel J, so that by turnlng the band wheel J, the stem may be elevated and depressed, irrespective of the rise and fall of the rod (l) and without rotating the latter, all as herein shown and described.

N. C. TRAVIS.

vWitnesses: a

A. E. S'I'EARNS, WILLIAM G. PINKARD.

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