US937288A

US937288A - Check-valve.

Info

Publication number: US937288A
Authority: US
Inventors: Charles J Drury
Original assignee: Individual
Current assignee: Individual
Priority date: 1908-07-20
Filing date: 1908-07-20
Publication date: 1909-10-19
Anticipated expiration: 1926-10-19

Description

C. J. DRURY.

Patented Oct. 19,1909.

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cnAnLEs J. nanny, or La JUNTA, eoLoaAno.

CHECK-VALVE.

To all whom 'it may concern:

Be litknown that I, CHARLES J. DnunY, of La Junta, in the county. of Otero and Staf/e of Colorado, have invented a new and useful Improvement in Check-Valves, and do hereby declare that the following is a full and exact description thereof.

The object of my invention is to' provide a check valve which is especially designed for use in the injector. inlets of boilers, although it is capable of application to various other devices. In the past, great diicult-y has been encountered in obtaining a checkjvalve of this nature that was thoroughly satisfactory. The check valves that have been in use become readily stuck through the interference of particles of foreign lmatter of different kinds, such as bolt heads, solid impurities in the water, parti-- cles of rubber, etc. When this has occurred,

it. has almost invariably been found necessary, owing to the inaccessibility of the parts of the check valve, to allow the steam to escape from the boiler, to remove the water,

and overhaul the l-boiler generally; and in' the case of locomotives it has been found necessary to return the engine tothe round house and overhaul the boiler in the same Y 1 v he check valve, which is an embodiment of my invention, has been designed to avoid all of these diliculties. In general, it is a double .check valve. The lower one of the valves, the valves being so constructed that they operate independently of each other, is smaller in diameter than the upper one of the valves, and has a very .much smaller throw or lift than the upper valve. In fact, the throw or lift of the upper valve is preferably, although not4 necessarily, exactly twice as great as that of the lower valve.` In a construction of this kind it will be readily seen that any foreign particles that might get into the injector pipe might,.by some possibility, stick the lower valve, and retain it in .an inoperative position. Under these circumstances, however, the check valve would continue to operate perfectly, owin to the fact that the upper check valve woulv effectively retain the boiler pressure until the lower check valve could be` repaired..

` slieemqatmn of Letters Patent. Application me :ruy 2o, 190s. serial No. 444,417.

interval is Patented oet. 19, 1909.

larger than the corresponding opening for the lower check valve. Again, owing to this arl-an ement, should any hard particle scratc the lower valve and then pass through, this particle would readily pass beyond the upper valve into the boiler without scratching it. In such an event, the upper valve would continue to work perfect and retain the boiler pressure, while the lower valve could be detached and repaired, as above indicated.

Furthermore, one of the main features of my invention is to provide a valve structure comprising two independently operable superimposed valves, having an intermediate web with more or less restricted openings. The purpose of this construction is to prevent anyl broken parts of the lower valve,-

should the lower valve become broken, from reaching the upper valve and sticking it.

In the accompanying drawings F1gure 1 is a vertical section of a valve and valve casing, located in an injector pipe, which is connected to a boiler; and Fig. 2 is a horizontal section taken through the valve casing, looking down upon the web.

v 1 re resents a fragment of a steam boiler,

to whlch is connected a right-angled coupling 2 by means of bolts. This right angled coupling 2 has located in its top a screw cap 4, having depending from its bottom a stop 5. A valve 6 is located within the coupling 2. The upper part of the valve is provided with a stem 7 which is adapted at times to contact with 4the stop 5.

Screw threaded into the bottom ofthe right angled coupling 2 is a pipe section 8', which haslocated on its top a valve seat 9 for the valve 6. The lower part of the pipe section8 is screw threaded at 10 to receive an interiorly screw threaded pipe coupling 11, constituting a valve casing for the lower valve 12, which is smaller in diameter than valve .6. This pipe coupling 11 is provided with a valve Aseat 13 for the valve 12. A web 11,4 is `fxedly secured inthe pipe section 8 immediately above the valve 12, but separated therefrom by a suitable interval. This referably exactly one-half of the distance etween the stem 7 of thevalve 6 and stop 5 therefor, although this eXact relation I do not consider essential. The

.lower part of the pipe coupling 11 is exscrew thread 10 on the (pipe section 8, and the exterior screw threa on the pipe coupling 11 are exactly the same size, so that in case of injury tothe lower valve, o r threads on valve cage the valve and the lpipe cou ling containing a valve seat therefor, mig t be entirely discarded for the time being and the injector' pipe 15 coupled directly to the pipe section In the operation of the device, should any solid particle succeed in sticking the lower valve, the upper valve would continue to operate successfully to retain the boiler pressure until the particle could be Yremoved from the lower valve. If, however, such a particle should pass the lower valve, it could, of course,l by no possibilit stick the upper valve, since the throw o the latter is, as

has been indicated above, preferably twice as great as the throw of the lower valve.

Again, should the lower valve become` scratched by the passage of Some hard article therethrough, and thus be rendered eaky, such a particle would not, owing to its size, in all probability, scratch the upper valve. Such being the case, the upper va ve would operate perfectly alone until the lower valve could be taken out and ground.

One of the important features of my invention comprises the insertion ofthe web 14 between the valve seats of the two

valves

6 and 12. Should. the lower valve for any reason become broken, the particles could not, owing to their size, reach the valve seat of the upper valve, owin to the small size of the openings'provide through the web. It must be obvious that should not such a web be provided, any large Aparticle that might become detached from the body of the lower valve might readily succeed iii sticking the upper valve. With the provision of the interposed web, the efficiency of the upper valve is very markedly increased. In fact, the operation of repairing the lower valve might, in the case of locomotives, be accomplished without returning the locomotive to the round house, that is Vto say, that the pipe coupling 11 with the valve12 contained therein could be taken entirely off while the locomotive is on the road, and the end of the injector pipe 15 be attached directly to the pipe section 8; or, in case the dama e to the lower valve is so slight that it could be repaired by the locomotive en neer, the coupling containing this vave might be unscrewed, the valve repaired by esmas him, and the coupling returned to4 the pipe without the necessity of returning the engine tothe round house for re airs. In such an arrangement it will be o vious that a very great saving in time and expense can be effected.

While I have described my invention as applied. articularly to a pair of vertical c eck va ves, I do not wish it to be understood that I am necessarily limited to valves located in this position, as m invention can bereadily adapted to valves ocated in other positions, and to diierent types of check valves. The improvements which I have a plied to the valves described might readily e applied to check valves of other kinds, that is to say, by providing the forward valve, i. e. the one nearest the outlet of the pipe, with a larger diameter and a larger throw than the rearward valve. It is obvious also that man other changes might be made in the detai s of the construction without departing from the spirit of my invention. l

What I claim and desire to secure by Letters Patent is:

1. In a device-of the character described, the combination of an inlet pipe and two in dependently movable check valves contained therein, the forward valve having a larger throw or lift lthan the rearward valve.

2. In a device of the character described, the combination of an inlet pi e and two independently movable check va ves contained therein, the forward valve being larger in diameter and having a larger throw or lift than' the rearward valve.

3. In a device of the character described, the combination of an inlet ipe, two check valves contained therein, an a web havin restricted openings interposed between the valves.

4. In a device of the character described, the combination of an inlet pipe, two independently movable check valves contained therein, the forward valve being larger in diameter and having a larger throw or lift than the rearward valve, and a web having restricted openings interposed between the valves.

In testimony that I claim the foregoing I have hereunto set my hand.

CHARLES J.. DRURY.

Witnesses:

ZJ. R. HICKMAN, JOHN E. HALL.