US412293A - Pressure-governor - Google Patents

Description

(No Model.) B, PRICE.

PRESSURE GOVERNOR. No. 412,293. Patented Oct. 8, 1889.

Wz'nesses. Inl/emol" iw/@5MM l N PETERS vnowumgnpner. wxmzngtm nv cA 'UNITED STATES PATENT trice0 GEORGE B. PRICE, OF PHILADELPHIA, PENNSYLVANIA.

PRESSURE- GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 412,293, dated October 8, 1889.

Application filed November 23, 188B. Serial No. 291,714. (No model.)

To all whom it may concern..-

Be it known that I, GEORGE B. PRICE, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented a new and useful Improvement in Pressure-Governors, of which the following is a specification.

My invention consist-s in a mechanism of peculiar construction for the purpose of automatically regulating the flow of pressure from a containing-reservoir to an expending one, where it is desirable that an even flow at a given pressure shall be maintained regardless of the rapidity of that flow. I eifect this by the combination of a spring-balance and a balanced throttle-valve and adjuncts, which, with their operation,are now to be more particularly described.

In the accompanying drawings, the valve mechanism is shown in vertical section in Figure l. Fig. 2 is a representation of the elements of the lever shown in the lower port-ion of Fig. l.

In the accompanying drawings, V is a balanced throttle-valve, having a vertical movement and actuated through stem R, yoke Y, links Ar r, and levers L L by the springs S S.

A is a cylindrical chamber with projecting lia-nge f, having also an interior chamber C, which suitably contains valve V.

D is a liexible diaphragm centrally fastened to stem R, and circumferentially fastened between flange f and ring II. Ring ll is also suitably designed with supports for hanging levers L L, and otherwise providing the necessary frame-work for the spring mechanism.

Y is a ycke,which rises and falls with valve V.

S S are'spiral springs of specially-designed proportions, which are iinely adj usted by thin washers between them and the spring-caps s s.

By means of the screw-wheel B the valve V may be thrown into full opening or secured tightly against its seats a: as.

The operation is as follows: High pressure enters through inlet I the inner chamber C, whence it escapes, upon the valve V being raised, into outlet O, at the saine time filling the interior of chamber A, and pressing upon the inside of diaphragm D causes it, and with it valve V, stem R, yoke Y, dsc., to descend; but this movement imm ediatelybeing resisted by the action of springs S S through levers L L, links fr r, ttc., the valve V is again forced upward and poises at a point where the outflowingA pressure, acting upon diaphragm D, shall exactly balance the effective resistance of the springs.

As the desired quantity of the pressure in outlet O may vary, or since the force of the original supply through I may be constantly diminishing, it is obvious that no one unvarying size of orifice of valve V would meet the requirement, but that this should vary with the need. This is accomplished by the tapering form of the under side of the upper disk of valve V, by which more or less volume is admitted to t-he outer chamber A as valve V rises or lowers. It is also obvious that to keep this fiow at a uniform pressure a given constant power mustbe exerted through stem R (in opposition to pressure within on diaphragm. D) regardless of the relative position (up or down) of valve V. Now the usual mode heretofcre employed for operating similarlyintended valves has been a simple spiral spring in direct compression. Such arrangement must invariably be faulty in this particular, since no spiral spring so acting (in direct compression) will produce the same resistance at any two points of its compression. The arrangement to produce this desirable effect comprises a very important part of my invention, and is applicable in general to mechanisms where a uniform resistance within a given movement is desirable by a springbalance. The principles upon which this part of my device is founded are the principle of the bent llever and the principle of the spiral spring in suitable conjunction with eachother. Their combined action may be brieiy eX- arm L. In position No. l the effective levern age is shown by the short dotted line Z. When in this position, the spring S (having been designedly proportioned) is in, say, ten pounds compression, an d is exerting that lifting-power upon link -r and. stem R. When lever is in position No. 2, the spring is compressed to twenty pounds resistance; but the effective leveragenowbeing represented by lines XLI-Z2, or twice as much as before, the spring S is exerting through link r only half that force,

plained by reference to two positions cf lever- IOO or still ten pounds at r and R; hence by such an arrangement it becomes simplya matter of suitably proportioning spring S and relative lengths and angles of lever-arms L to obtain a constant resulting force at stem R.

Having described the spring mechanism, I will now call attention to the peculiar features of the balance-valve V. In balancevalves which have seating-surfaces as ordinarily constructed the slightest rise of the valve enlarges at once the eiective area of resistance on account of the seating-flanges being subjected to the outrush of the ccnned pressure. In my design this difficulty is largely overcome, as it Will be seen by reference to the drawings that by reason of the prolonged depth of the upper disk or head the valve V must rise that distance before the confined pressure can have free escape, by which time the seating-anges have moved so high from their seats as to offer no additional effective area.

Having described myinvention,what I claim as new and original, and desire to secure by Letters Patent, is

l. The combination of a spiral spring and a bent lever, the arms of which shall be of such relative length and arranged at such angles to each other as that the spring shall produce continuously a uniform power in a given direction at the end of longer arm of said lever.

2. In a pressure-governor, the combination of a spiral spring and bent lever mechanism with a balance-valve, flexible diaphragm, and suitable connections between the diaphragm, valve, and spring mechanism, substantially as shown.

GEORGE B. PRICE.

Vitnesses J. D. MOFERREN, PAUL W. EVANS.

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