US184294A - Improvement in steam stop-valves - Google Patents

Description

` zamen-sheen.

STEAM STOP-VALVE.

No.'184,2944, Patented Novym, 187s.l

THE GRAPHIC COMM 2 Sheets-Sheet. 2.

A. ORME. STEAM STOP-VALVE.

Patented N'ov.14,1876.V

THE GRAPHIC CDROM ner.

UNITED STATES PATENT OFFICE.

ALEXANDER ORME, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN STEAM STOP-VALVES.

Speeication forming part of Letters Patent No. 184,294, dated November 14,1876; application filed August 17, 1876.

To all 'whom it may concern Be it known that I, ALEXANDER ORME, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Safety-Valves; and I .do hereby declare the following to be a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure 1 represents a vertical central section of a safety-valve embodying my said invention. Fig. 2 represents an elevation of the same, a portion of Ithe outer shell being broken away, showing a part of the operating parts. Fig. 3 represents a sectional plan of the same taken on the line a: Fig. 1. Fig. 4. represents a top view of the valve-seat detached and Fig. 5 represents an elevation of the same.

Like letters of reference indicate like parts.

My invention relates to that class of safetyvalves used upon steam-boilers for the purpose of relieving the boiler of any excessive pressure of steam above that which it is designed to carry; and the object of my invention is to improve the safety-valve for which I obtained Letters Patent dated March 16,

My invention consists in the means em- '.ployed in holding the valve upon its seat against the pressure of steam in the boiler, and in the means employed in holding the adjustable angular seat in a fixed position when adjusted, and also in the arrangement of the parts employed in locking the `outer case to the base, so as to prevent the valve from being tampered with, all of which will be hereinafter more fully set forth.

In the drawing, A represents 4the base of the valve-case, which may be attached to the dome-plate ofthe boiler in any known man- B is the case inclosing the operating parts, and which is provided at its lower end l with an outward-projecting ilange, a, titted to rest upon a like flange, a', on the base A,

i as shown in Fig. 1, and is firmly held thereon by screw-bolts b passing through the said flange a into the flange a', as shown in Figs. 2 and 3. The base A is provided at its center with an annular opening, C, which communicates with the interior of the boiler through a corresponding opening in the domeplate. (Not shown.) D is annular bushing, which is tightly tted within the opening C, and extends upward above the base, and is screw-threaded at its upper end externally, as shown in Fig. 1.

E is an annular ring fitted upon the threaded portion of the bushing D, and so arranged as to admit of being turned around on the said bushing, the object of which is to allow the ring to be raised or lowered as may be desired. The upper edge of this ring is chamfered on its inner side, forming an angular face, d, the latter extending downward to the end of the bushing.

F is the valve, which is provided on its lower surface with radial wings e adjusted to fit the bore of the bushing in the usual manner. The diameter of the upper portion of this valve exceeds the diameter of the wings formingan annular horizontal face, f, adjusted to bear upon the upper end of the bushing, as shown in Fig. 1, and the valve is leveled on its outer side, forming an angular face, d', the plane of which is parallel with the plane of the angular face d on the ring. G Gr are vertical studs, which are permanently secured within the flange a. of the base, and extend upward to a point slightly above the center of the case. H is a cross-head, mounted on the upper end of the studs, and secured in a fixed position thereon by screwnuts g g arranged upon the respective studs above and below the cross-head. J is a primary spindle, which passes loosely through an opening formed centrally through the cross-head, and extends downward to a point immediately over the valve, as shown in Fig. 1, and is provided at its lower end with an annular flange, n, formed thereon. K is a spiral spring, which is loosely fitted' upon and around the primary spindle between iiangen and the cross-head. The primary spindle is made hollow, as shown in Fig. 1, the said hollow or cavity extending upward to a point near the center of the cross-head, and converging at its its" upper end to one common center, as shown atK. L is the valve-spindle, which is loosely fitted within, the. cavity inthe primary spindle, and is. made pointed atits ends, as shown at jj. The upper point of the spindle is fitted into the converging point of the cavity in the primary spindle, and the lower point is tted into a conical recess, m, formed centrally in the upper surface of the valve, as shown in Figure l.

rEhe object of loosely Iitting the primary spindle within the opening in the cross-head, and of fitting the valve-spindle within theprimary spindle and recess in the valve, as described, is to admit of a slight radial movement oi' the valve-spindle and primary spindle independent of any movement of the valve, and .thereby prevent any unequal pressure of the spring upon the valve, which would otherwise be produced by anyimproper adjustment of the cross-head.

M is a horizontal lever, which is fulcrumed to a ybracket on the inner surface of the case, near its upper end, and extends outward through a mortise formed therein, and is so .arranged as to admit cfa free-and-easy tilting movement. This lever is fork-shaped at its inner end, and passes into a groove, z', formed around the primary spindle near its upper end, the object of which is to provide a means of lifting the primary spindle so as to relieve the valve from the pressure ofV the spring, and thereby allow the valve to li't from its seat when the pressure of steam in the boiler is below the pressure at which the spring is adjusted to carry.

The diameter of the upper end of the case is less than the diameter of the lower end, forming a neck, A', through which the steam escapes from the case.

N is an annular concaved plate, which is attached to a cross-bar, a', extending centrally across the opening in the neck, as shown in Fig. l. The varea of this plate exceeds the area of the opening in the neck, and it is located below the same, so as lto form an annular space, a, between the periphery and the converging surface of the case, through which the steam escapes. The obj-ect of this plate is to provide a guard which `will prevent any substance from being dropped into the case that would in any way prevent a complete operation ot' the valve.

Looselymounted upon and around ring E is a supplemental ring, E', adjusted to turn thereon. 'The supplemental ring is made of a Strip of suitable metal, bent in an annular lform, and bolted together at its ends, as

shown in Fig. 3, forming an outward-projecting lug, t, arranged to bear against one ofthe studs Gr when the ring is turned to the proper point; or the .ring may be cast in an annular shape, with the lug t formed thereon, if desired. 'The ring E is provided at its base with an outwardly-projecting ange, 11e/,with- -in which is formed a series of notches, h, as -shown in Fig. 4, which notches are each adjusted to alternately receive a depending lug, h', on the lower edge of the supplemental ringE, by which means the ktwo rings are locked together, so that neither one of them can turn independent of the other, the object of which is to lock the ring E in a fixed position, when properly adjusted, by so adjusting the supplemental ring thereon as to bring the lug t against one of the studs.

D is an annular ring, loosely fitted upon and around the base of the case B, and ar-l loosely through the notches c in the flange of the ring, and are located on the case, at the proper distance from the bottom thereof to admit the ring between them and the ange a of the case. The ring D is also provided at its lower edge with an outwardly-projecting lug, p, corresponding with a like outwardlyprojecting lug, p, on the flange a of the case, which are each provided with an opening, lo", formed through themto receive the bolt of an ordinary padlock, by which means the ring can be locked so as to prevent it from being removed or displaced. p

The arrangement of the ring D is such as to wholly surround and cover the bolts uniting the case B to the base, and the notches in the flange are so arranged relatively to the position of the lug lo that when adjusting the ring upon the case, and in position to admit of passing the lock-bolt through the openings p, the ring must be placed in proper position on the case to allow the lugs e e to pass through the notches'iu the flange. The ring is then dropped down so as to rest upon the flange a, when it is turned partly around to bring the openin gs p in the same plane, thereby causing the flange on the ring to pass under the lugs, thus preventing the ring from being so elevated as to give access to the bolts connecting the case to the base without removing the lock-bolt, and thereby preventing the bolts from being unscrewed, so as to admit of removing or elevating the case, the object being to prevent the valve from being tampered with.

The spring K is compressed to produce a pressure on the valve persquare inch equal to the desired pressure of steam which the boiler is intended to carry by lowering the cross-head H and'tightening the nuts g g, so

-as to hold the cross-head at the requisite adjusted point. The ring E is so adjusted as to form a slight space between the angular face d and the corresponding face d on the valve, and is locked in position by the supplemental ring E', as previously described.

When the several parts are adjusted the operation of the valve is the same as described in my previous Letters Patent.

Having thus described my invention, what I claim as new, and desire to secure by Letvided with lugs e" e", ofthe ring D', ange a,

ters Patent, islugs p p', and lock-bolt openings p, substan- 1. The combination, with lghe valve F, of tially as and for the purpose specified.

the hollow primary spindle J, valve-spindle L, 4. The combination, with the case B, of the spring K, and cross-head H, substantially as annular concaved guardplate N, substanand for the purpose specified. tially as and for thev purpose specified.

2. The combination, with the ring E, base A, bushing D, and studs G G, of the supple- ALEXANDER ORME. mental ring E', substantially as and for the Witnesses: purpose specified. Y l N. H. SHERBURNE, 3. The combination, with the case B, pro- WILLIAM JONES.

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