US842060A - Relief-valve for locomotives. - Google Patents

Description

l PATENTLD JAN. 22, 1907. y TpL. BLAGHAMH. B. REID LJ. H. BEST.

RELIEF VALVE POR LoooMoTIvBs.

APPLICATION FILED FEB. 3, 1906.

2 SHEETS-SHEET 1.

wifi/W05@ No. 842,060. PATBNTBD JAN. 22, 190V T. E. BBAGHAN, H. B. REID @L J. H. BEST.

RELIEF VALVE POR LOCOMUTIVES.

APELIGATION FILED PBB.3.1906.

2 SHEETS-SHEET 2 pico onacoo OQIOOO ooe'ooo ATTORNEYS.

UNITED STATES PATENT onirica.

THOhllAS EDWARD BEAGHN, HUBERT BIRD REID, AND JACQB H. BEST,

i OF SHENANDOAH, VIRGINIA,

RELIEF-VALVE Fon LocoMoTivEs. i

I Specicationof Letters Patent.

Application tiled February 3, 1906 Serial No. 299,318.

Patented Jan. 22,1997.

" To all whom, it may concern:

" and exact description.

Be it known that \ve,"l.`HoMAs EDWARD BEAGHAN, HUBERT Bini) REID, and JACOB H. BEST, citizens of the United States, and residents of Shenandoah, in the county of Page and State ot Virginia,fhave invented a new and Improved Relief-Valve for Loco.- motives, of which the following is a full, clear,

This invention relates to locomotive attaclunents. While thel invention may be applied to Athe cylinders of locomotives using slidevalves, it is especially applicable where piston-valves are employed.

The object of the invention is to provide an arrangement which will operate to prevent compression in the ends oi the cylinders or steam-chest when the pistons are moving freely therein and Without steam and under such conditions as arise wh en the locomotive 1s dril'iing or running Alreely without steam, as 1n stopping or 1n going down a grade.

The invention consists in the construction and combination 0i' parts to be more fully described hereinafter and particularly set forth in the claims.

Reference is to be had tol the accompanying drawings, forming a part ofthis speciii'ca tion, in which similar characters of reference indicate corresponding parts in all the iigures.

Figure l is a side elevation of the cylinder and adjacent parts of a locomotive with which our invention'is employed. Fig. 2 is a vertical section taken through a relief'ryolve which constitutes a part of the invention 'ami taken inaplane parallel with tle axis jof the cylinder. Fig." 3 is a vertical section taken tl irough ilze lower portion of the relief-valve shown in Fig. 2, and taken in the plane of the line 3 3 of Fig. l-'-that is', Aat right angles` to the axis ofthe cylinder-and Fig. 4f is a plan of the relief-valve.V v

Referring more particular y to the parts, 1 represents the front and lower portion of the boiler, t-owhich the usual cylinder-castings 2 attach on each side. rll'iis cylinder-casting is formed below into a cylinder 3 and above into a steam-chest -l for the accommodation, respectively, of a piston having a pistonrod 5 and a piston-valve having a stem 6.

. In applying our invention in. each of the heads 7 of the cylinder 3 We providel tubular thimbles 8, one of which is illustrated in Fig.

L'. l The inner extremities of these thinibles are threaded into the-heads, as Will be readily understood, and their outer extremities are provided with similar threads 9, so as to en I able the' attachment of reliefevalves 10, one valve' being attached to each thimble, as

shown most clearly in Fig. 1. yThe construcA tion vof one Vof these valves is very clearly shown in 2 and '3. 'It has a substantially cylindrical. body 1l, having a vertical central axis, and from this body a hub i2 projects laterally, which screws onto the threads 9' and opens communication betweenthe interior of the body llt' and the interior of the cylinder 3. l v

The upper portion of the body l l is formed into a .contracted neck i3, beyond which' an expanded head 14 is formed, the said head being provided with a plurality of perforations 15, so that it constitutes a rose-nozzle- At its lower end the neck 13 is pro vided with a conical counterbore 16, Whichconstitutes a seat for a plunger or ping 17. This plug has a cylindrical bodylS, Which is of reduced diameter with respect `to the body 1l, as shown, so that an annular steam-space 19 is formed thereabout, as will be readily 'understood. The lowerl extremity of this body is enlarged into a head 20,Which its nicely in the bore ofthe body 1i and is preferably provided with packing-rings 2l, as shown.

The upper extremity of the plug 17 is formed into guide-Wings 22, which project upwardly into the bore of the neck 13 and vconstitute guides which assist the seating of the plug when it moves upwardl to its seat. The lower extremity of the bo y "il oi the valve is closed by a removable head 23, which preferably .makes threaded engagement tierewith, as shown, in this head there is mounted'centrally a stein 24, which is provided'with a thread 25, making av ICO tremity of the stem 24 projects as shown and is providedwith a bolt-head 27, which facilitates the adjustment of the stem by means of a wrench.

' ward movement ol the plug).

The lower portion of the plug 17 is formed with a'tapered bore 28, (indicated indotted lines in Fig. 2,) so that an elevated end face 29 is provlded. The stem 24 just described projects into this bore 28, and its extremit lies a short distance 'from thefaee 29. `t should be understood that this stem 24`constitutcs an adjustable stop to limit the down- It has also another function, which will described more fully hereinafter.

As indicated in ll1 ig. 3, the head 23 is provided w"ith a laterally-projecting nipple 30, which communicates through a duct 31 with a chamber 32, formed within the body 11 be- "iw the plug. This nipple is preferably substantially horizontal, and at a suitable point in its lower side we attach drip-cock 33. The valves 1,0 are attached at the heads of the cylinder, as shown, so that the nipples 30 roject outwardly or toward the side of the ocomotive. To these nipples` 3() we attach branch pipes 34, which lead upwardly and their seats.

. nozzles 14 with the outer air.

.ningunder steam.

does so with perfect freedom.

connect, by means ol' a suitable T', with a main pipe 35. This pipe extends upwardly over the steam-chest 4, at which point it is rovided with a suitable globe-valve 36.

eyond this glebe-valvc it passes into the interior of' the cyiinder-casting and communicates with the live-steam port, which leads from the dry pipe to the steam-chest.

With the construction described it should be understood that when steam is admitted to the under sides of the plugs 17 in the chambers32 it will operate to hold the plugs 17 upwardly and upon their seats 16. This the normal condition `when the engine is run- When the engine is to he allowed to run freely, as on a downgrade or when coming to a stop, when the throttle-is closed to shut oil' steam from the cylinder, the plugs 17 are no longer supported by the steam-pressure and fall by gravity away from In this way communication is opened through the thimblcs 8 and the rose- Ilence as the piston reciprocates within the cylinder it In this way no compression or rarefaction of the air or exhaust-steam Within the cylinder can take place. As the steam-chest 4 is in communication with the cylinder 3 through the usual steam-ports, it follows that the condition of the air within the steam-chest would become substantially the-same as that in the cylinder, and in this .way compression in the steam-chest is always prevented. This is liighly desirable, as it relieves thelvalve-stem 6 and. .valvc-geer-of severe strains to which l they lmight otherwise be subjected.

:in case the'rpipeconncctidns34 35, leading A'[L''the relief-valves; shouiitbecbme broken can proceed on one cylinder.

the .relief-plugs-U may be held against their y seats by means of the adjustable stems 24 by adjusting the same inwardly a sufficient amount. In this connection it should be understood that lthe inner extremity of the stem will advance until it engages the face 29 when the'plug' is upon its seat. From this arrangement in ease of the failure of the pipe connections the locomotive may still rmaintained in substantially goed running order.

In case of a breakdown affecting one cylinder the globe-valve which admits steam to .that cylinder will be closed, and the engine There is no danger o -the relief-valves freezing by reason of te drip-cocks 33.

Where ari-engine fitted with our attachment is standing in a roundhouse, there is no danger of the engine starting accidentally, as they sometimes do by reason of a leaky throttle-valve.' It being understood' that the plu rs 17 would be in a depressed position when t 1e engine was'standing, communication would be opened from the cylinders, so that any steam that escapes thereto would pass out into the atmosphere without tending to collect under pressure.

The relief-valves are adapted to be used with. four-cylinder tandem and cross-compound locomotives, and in this instance the valves are connected to the low-pressure cylinders. -'l`he use of the relief-Valves tends to imrrease the life of the piston-packing, because they prevent back pressure.

llaving thus described our invention, we claim as new and desire to secure by Letters latentl. .ln cimibination, an engine-cylinder, a relief-valve having a bodynvith a seat formed therein, a plug movably mounted in said body and adapted to rest against said seat,

.said valve having a chamber beyond said plug, means for admitting live steam to said chamber, and means for opening communilation from said cylinder to said body between said seat and said chamber whereby when said plug is unseated the interior of said cylinder may communicate with the atmosphere. 1

2. A relief-valve consisting of a body having a seat, a plug movably mounted in said body and havin;r a substantially cylindrical body with a saouldcr normally resting against said' seat said body having an inlethub'adapted to admit steam to the space around said plug, said body having a steamchainber beyond the end of said plug whereby steam-pressurc in said chamber will hold said plug against said seat.

3. An engine-cylinder in combination with a relief-valve having a body in communical panded l valves presenting seats in the lower portion mouiited in said valve-body, said plug having a shoulder normally resting against saidseat, said valve-body having a chaniberadapted to receive steam-pressure to hold said plug on said seat.

4. In combination, an engine-cylinder, relief-valves mounted in the heads thereof and communicating with vthe interior of said cylinder, .said relief-valves having reduced necks in the upper portions thereof and ex- (perforated heads therebeyond', plugs mounte respectively in said valves and having guide-rings received in said necks, said of said necks to receive'said plugs, said plugs having heads guided in sai valves, means for admitting steam to the under sideof said lugs, and adjustable stops for limiting the downward movement of said plugs.

5. A relief-valve for a locomotive-cylin der, having a substantially cylindrical body with a hub communicating withthe interior thereof, said body having a contracted neckand an expanded perforated nozzle therebe` yond, -a plug having a head guided in the lower portion of said body and adapted to come upon said seat, said plug having guiderings formed at the upper extremity thereof means for admitting steam to the interior thereof.

In testimony whereof we have signed our names'to this specification in the presence of two subscribing witnesses.

THoMA's EDWARD BEAGHAN. HUBERT BIRD REID. JACOB H. BEST. f

Witnesses as to Beaghan and Reid:

Jos. R. ELLIS, J. S. KELLEI.

Witnesses as to Jacob H. Best:

W. B. SPRINKEL, W. A. KooNTz.

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