US112222A - Improvement in steam safety-valves - Google Patents

Description

G. H. CLEMENS'.

STEAM SAEETY VALVE.

No. 112,222. Patented Feb. 28, 1871.

l i Y, illllr `chamber communicating with the boiler.

fitte GILBERT H. CLEMENS, OF CHICAGO, ILLINOIS.

Letters Fatent No. 112,222, dated February 28, 1871.

IMPROVEMENT IN STEAM SAFETY-VALVES.

The Schedule referred to in these Letters Patent and making part of Athe same.

To all whom it may concern:

Be it known that 1, GILBERT H. CLEMnNs, ot"

Chicago, in the county of Cook and State of Illinois, have invent-ed certain new and useful Improvements in Combined Steam Safety-Valves and Whistles; and I do hereby declare the following to he a full, clear, and exact description thereof, whichwill enable others skilled in the art to make and use the same, reference being hadto the accompanying drawingibrining part of this specification, in which- Figure 1 is a front elevation oi my invention Figure 2 is a vertical section of the saine cutting the whistle through the center, showing the external parts ot'v the valve-case;

Figure 3 is a vert-ical central section of the valvecase taken on a line, a u, with whistle removed; and

Figure 4 is a cross-section or plan taken on line l (I.

Similar letters of reference indicate corresponding parts in the several figures ol' the drawing.

The object of my invention is to provide a selfolosing safety-valve combined with a whistle for `steam-boilers, each being so arranged as to perform their separate and necessary function and rIhe improvement consists in providing the lower portion or base of the valve-case with a receptacle- \Vithin said chamber is secured the main valve, which is so arranged, together with the arrangement of the case,` las lo forni a lateral enlarged supplernetal-chamber between the lower side of the bulk-head or c ap of the base and upper surface of the valve, into which the steam is admitted from the receptacle-chamber, by lwhich the valve is iirrnly secured in a closed position by the pressure of steam against the upper surface of the same.

Also, in providing said base with a hollow tube, within which is secured a prhnary valve having its seat upon the upper surface of the bulk-head, and communicating with the receptacle-chamber through the main valve, by which means the steam is couiined in said supplementalchamber, or allowed to escape therefrom by the opening-or raising of thc same. n

Also, in the manner of seeming the base ofthe valve-case to the boiler' or do|nc-plate of the saine.

Also, in the combination ol a steam-whistle with the saiety-valve, a description oi' which in` detail will bchereinaltw fully given. f

in the dra\\'ing f l A represents the hase of the valve-case, the lower enr`lot"wliich is ground a steam-tight joint, and

Vfitted upon the upper surface of the dome-plate B ol' the boiler.

C is a screw-threaded disk, which is firmly ailixed within said case, and is provided with a series oi' The upper end of said case is screw-tlueaded externally, upon which is fitted the bulk-head or cap F.

The lower portion of said base is provided with a receptacle steam-chamber, G, which communicates with the boiler thronghth6- openingsv ct ot' the disk.

The inner side of said base at the upper cud of the receptacle-chamber is so arranged as to form a valve-seat, upon which is fitted the main valve H, by

which the steam is secured iu the case.

Within the sides of said ease is a series oi' openings, d d', which extends inward and upward from the outer side of thecaseeto the main valve, through which the steam escapes from the receptacle-chamber when said valve is raised.

Ilieupper lsurface of said valve H is Slightly con- 'cave toward its center, and is so arranged as to form a supplemental steam-chamber, G', between its upper side and the lower surface ofthe hulk-head or cap of the basc,thc horizontal area of which is near twice the area of the upper portion of the receptacle G.

Aiixcd to the upper portion of said bulk-head or cap is a hollow tube, I, the lower end of which is screw-threaded externally, by which the same is attached to the upward-projecting portion F' oi the hulk-head. i

Within the upper end of said tube is a sorewthreaded' coupling, J, upon the outer s ide of' "whichiis attached the cap Jo'f the tube. l

K isl a primary valve, which is fitted Within the upward-projecting "portion Il" of the buik-head, below the end of tube Land is so arranged' as to admit of a 4slight vertical movement, the seat of said valve being formed in the upper surface of the' inner portion of' thesame.

Attached to the center and lower port-ion of said valve is stem e, the lo'weiend oi' which is slightly enlarged, and is looselyr fitted within an aperture, f,

in the center of the main valve H, the diameter' of said aperture being such as to allow the steam from the receptacle-chamber G to pass through the same around the sides of the enlarged portion of stem c into the supplcmental-chaiuber G'.

The upward-projecting portion F of the bull'- liead is provided with a series ol' openings gp through which the steam escapes from said supplemental-ehamber when the primary valve 1i is raised.

Aftixed to the upper surface of said primary valve is a stem, L, which extends upward through tube I, and is provided at its upper end with a bolt or rod, h, to which is attached a stirrup, M.

'lhe lower end ot' said valve-stein, near the valve, is slightly' enlarged, forming a shouhler, upon which is supported a collar, ai, which is loosely fitted around the same.

Upon and around the said valve-stem, between the upper surface of said collar and lower cud of coupling J, is a coiled spring, N, which is so arranged as to hold the valve iirmly against and within its seat.

Attached to and around cap J ot' tube l is a colf lar, O, which rests upon -a shoulder, on, formed ou the lower portion of said cap.

. he said collar is secured in properV adjustment by a set-screw, n, which passes through its side and against the side oi'v the cap.

Aiiixed to the side of said collar is a vertical arm,

P, to which is pivoted level' (4),.

Firmly bolted to the outer side of said arm is a curved spring, It, which extends outward and upward against the lower side of lever Q, by which the same is secured in proper position, the said spring being so arranged as to allow the outer end ofthe level' to be moveddmvnward when desired, and to forcel the same back to its normal position as power is removed trom the lever.

livoted to the forward end of said ieveris a stirrup, S,'to Ythe lower end of which is attached the whistle-ring T, the same bfiug so arranged as to admit ota vertical movement.

The said lever is torked-shape, andv is also attached to stirrup M of 'the primary-valve stem by means ot bolt p passing through the same, said bolt also passing through stirrup b, thus properly connecting the whole. l

' Stirrup M is provided with a vertical mortise, 1', through which said bolt passesfthe length of said mortise beingsuch as tm allow the leverto be tilted; upward suliciently to raise ringl nearly to or against the Hannes ofthe base as boltp is brought-in contact -with the said stirrup; thus the whistle-ring is raised to its proper position beforev the' steam is discharged ii'om the respective chambers by the raising ot' the primary valve.

Atlixed to the upper end of said stirrup M is a rod, t, the object ot' which is to raise said primary valve independent of the whistle-l'ing, the length of the xnortise being such as to admit of the same.

lhe upper portion of tube I, below cap J', is screwthreaded externally, upon which is fitted the whistle case U, said case being so arranged as to admit of being adjusted to a proper position with the openings gg ot' the buik-head, and is firmly secured by a screw-tlneadedwasher, V, upon said tube, above the same. V

I provide the upper portion of' the base A with an'adjusting-nut, A', which is fitted upon the screwthreaded portion of the same between its shoulder and the shoulder of the bulk-head or cap,l1`, the object of which is to secure a steam-joint, and to rhold the said bulk-bead firmly in position when adjusted to the required height, thereby graduating the space, vertically within the supplemeutal-chamber.

I do not wish to confine myself' strictly to a screwtln'caded disk, C, as described, as I sometimes construct the base ot' the case and disk in one piece with the proper openings, either of which will produce the saine result.

Nor do I wish to be confined exclusively to the bolt or rod 7a, bywhich stirrup M is connected to the primary valve-stein, as a chain may be used to connect the saine and with-the same result.

'lhe manner oi" att-aching my invention to the boiler and its operation is as follows:

The yoke E is first passed through thc hole in the dome-plate B, and brought to its proper position under the same. Base A of the valve-case is then placed upon the upper side 0f said dome-plate, and bolt D passed downward through disk C and screwed firmiyinto tbe yoke, 'lhus the said case is firmly attached to the boiler, and as steam is generated in theboiler it tlows into chamber G ot' the valve-ease, through the openings ab ot the disk and dome-plate, filling the said chamber. The steam then passes through the opening 4in the main valve H, around the enlarged portion ol the primary valve-stem c, into the siuiiplemental chamber Gr', filling the same, by-which means the main valve H is tightly closed by the overbalanced pressure oi' steam upon its upper suri'ace.

lhe primary valve K being arranged to weigh the 'steanrin -the boiler, and as the same exceeds the limit allowed, the said valve is raised from its seat by the pressure of steam against the lower end'ot' stem c, which allows the steam within the supplementalchambcr to escape through the openings in the bulkhead, thereby-reducing the pressure against the upper surface of valve Hs"utlicient to cause the pressv ure beneath the same to overlmlauce that above, by which the said valve is raised, and the steam trom the boiler escapes over the valve and, through the openings il' d oi' the case. v

'As soon as the steam iu the boiler is sufliciently reduced to -bring thc pressure Vwithin the limit required, the primarywalve reseats,`aml the supplevmental-chamber instantly fills, thereby closing the Vmain valve.

Y seat, consequently giving greater surface for the steam to act thereon and a greater pressure upon the springs when the primary valve is raisedfrom its seat, and, at the same time, reducingv the Apressure of the steam in supplemental-chamberG' downward upon the upper' surface of said enlargement.

Having thus described my invention, What I claim as new, and desire to secure by YLetters, Vvlatent, is-

y main, valve. 1I, the whole arranged substantially as Aand for the purpose described.

3. The enlarged stem e ot': the primary valve K, in coinbination'with opening f of valve H.

4. The adjusting-uut A', in combination with base A and bulk-head or cap F, substantially as and for the purpose described.

5. The bolt D and yoke E, iu combination with adjusting-cup T and whistle, substantially as and fol. base A, the whole larranged substantially in the mauthe purpose described. ner and for the purpose specified. Y

6. The combination of the strrup M with lever Q, bolt h and valve-stem L with spring N, substan- Witnesses: tially as and for the purpose described, N. C. GRIDLEY,

7. In combination, the steam safety-valve, with N. H. SHERBURNE.

GILBERT H. GLEMENS.

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