US397170A

US397170A - Slide-valve

Info

Publication number: US397170A
Authority: US
Publication date: 1889-02-05
Anticipated expiration: 1906-02-05

Description

(No Model.)

F. C. OLBAVER.

SLIDE VALVE.

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UNITED STATES PATENT @Trios FRANK (l. CILEA/HIER, OF TERRE HAUTE, INDIANA.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 397,170, dated February 5, 1889.

Application tiled August 14, 1838.

To all 107mm jt may concern/.-

llc it known that I, FRANK (lL'EAVER, a citizen ot' the United States, residing at. Terre Haute, in the county el' Vigo and State et Indiana, have invented certain new and useful Improvements in Slide-Valves t'or Steam-Engines; and I do declare the :Iiollowing tobe a tull, clear, and exact description otf the invention, such as will enable others skilled in the art to which it appertains to make and use the i same, reference being had to the accompanying drawings, and to the letters and tigures of ret'ercnce marked thereon, which Vtorni a part et this specification.

illy invention relates to improvements in slide-valves for steam-engines, and the obj ects are to provide an improved balancing-ring and packingjoint, whereby the contact between the surfaces of the balancing-ring and valve-body will be maintained steam-tight, andthe contact of the halan cing-rin g with the cover of the steam chest will also be steamtight and the steam-pressure be excluded from the top of the valve, reducing or removing the steam-pressure between the back of the valve and t-he steam chest. I attain the objects of my invention by means ol the mechanisms illustrated in the accompanying drawings, wherein- Figure'l is a transver sectional view, in elevation, on the line :c of Fig. el. Fig. 2 is a longitudinal view, ink elevation, taken on the line y y of Fig. 4. Fig. i3 is a detail sectional view of a portion oit the valve-top and balancing-ring made on an enlarged scale, showing the packing-seat, the packing arranged therein, and the steam ports and ways behind the packing. Fig. 4 is a plan viewoE the balancing-ring. Fig. is a detail view wherein the packing is arranged in the balancing-ring.

Reference being had to the drawings, A designates the valve-seat on the cylinder, having steam-ports l 2 and exhaust-imrt 3, as usual, and on this cylinder over the. valve and ports is secured the steam-chest l.

I3 designates the valve,having a base to lap the steam ports, as shown, and an exhaustchamber, 5, in communication with the exhaust-port ot' the cylinder. 0n the neck (i of the valve is the yoke 7, having attached thereto the valve-rod S, working through the Serial No. 282,713. (N0 model.)

usual p.1cking,. in the side et' the valve-chest. The top portion ot the valve is formed with a groove, l0, exteinling enti relyv about it, to constitute a seat for the packing. In the back wall ot' this groove is a channel, ll, into which the steam-ports open. One of the edge walls ot the groove l0 is incl ined, as shown, in order that the packing, as it may be pressed outward, may always maintain a steam-tigl'lt joint and prevent the steam from obtaining acc over the top of the valve, causing excessive pressure between the valve and its seat. In this groove l0 is arranged the packing lil, which is packed to till the groove, except that its back is made to bridge the channel ll in the back wall to leave steam-space behind it for the steam to distriimte in as it finds access through the ports l2.

C designates 'thebalancing-ring. This ring consists of a shell formed to set aboutthe face ol the upper part of the valve, as seen in the drawings, and has its sides connected by crossbars l-l, the upper faces of which are arranged a slight distance below the upper face of the ring, in order that their surfaces will not bear on the steam-chest and increase the wearingsurface of the ring. The lower edge of the balancing-ring stops short of the inlet of the steam-ports to the packing, so that the access of steam to these may not be interfered with. I prefer to make the part of the valve above the neck of slightly smaller dimensions than the neck, so that 'if the yoke wears the neck and has to be dressed down the upper part or head, which carries the balancing-ring, need not be altered. I also make the balancing-rin tapering lfrom bottom to top ou the exterior.

0n the top ot' the valve chest are formed either seats or stu-ds l5, and on the under side of the cross-bars of the balancing-ring are similar devices, lli, which constitute stay/s or seats for springs 17, interposed between the top ot' the valve and the cross-bars of the balancing-ring, and exert their force to hear the ring upward with its top against the survlace of the valve-chest. rlhe cross-bars not only serve as means for holding the springs, and thus toV litt the ring, but they strengthen the ring.

As I make claim to the novel arrangement and construction ot the packing and IOO its functional relation to the parts, whether located in the bailan@ing-ringor in the head of the slide-valve, I have shown in Fig. 5 ot the drawings the balancing-ring' formed with thc packing-groove in its inner face and the steam-ports leadingI into the channel and the pat-king arranged in the groove, the head ot't he valve bcingsinooth and plain ou its sides.

By my construction l materially reduce the superficial Contact ol' the top ot' thebalaneingring and steam-ehest, and atthe saine time etleetually seal the steam from iindin its way over the valve, therebyv reducing,l the pressure, and consequently the friction between the valve and its seat.

'lhe packing' may consist ol` an)v suitabh-Av material adz'lipted lo resist the disinlegrating i and deleterious el'toi-ls ol' stealu-sueh as fibrous material, leather, rubber, asbestus, or

composite material now usr-d t'orlhe l'nirpose. l

l. The combination ot' the slide- Valve disposed between the top of. the valve and the cross-bars of the balance-ring', substantially as described, and for the purpose specified.

2. In combination, the slide-Valve forni ed with a lJalance-ring, seat olf less exterior diaincter than the yoke-seat and formed with a packing-seat, the packing' arranged in said seat, steam-ports leadingI to the back ol the packing, the ljialance-.ring` formed to set over the top o'l the valve an d having' upward and inwardly inclined outer faces and provided with cross-bars7 and the sprin between the top of the valve and the cross-bars, substantially as described, and for the purposes stated.

3. The coinbinatioi'i, with the slide-valve formed with a packing-scat, said packing-seat having' one ot its edges formedto incline, as shown, and having steam-passages opening through its back, of a packing arranged in said packing-seat and havinone ot' its edges formed to titthe incline ot' the seat, substantiallfY as (,leseribed, and for the purpose speer fied.

In testiinon y whereof l altix my signature in presence of two witnesses.

FRANK C. CLEAVER.

VWitnesses:

A. WEINHARDT, O. T. NOBLE.