US635051A - Valve. - Google Patents

Description

Pa tented Oct. 17, I899.

No. 635,05l.

P. MEEHAN &. R. GRAY.

V A L V E.

(Application filed Aug. 12, 1898.)

2 Sheets-Sheet (No Model.)

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N0. 635,05l. Patented Oct. I7, I899.

P. MEEHAN & R. GRAY.

V A L V E.

(Application filed Aug, 12, 1898.)

(No Model.)

[71 van to 7'6 0 iTn STaTn TENT Tries.

PATRICK MEEHAN AND ROBERT GRAY, OF LOWELLVILLE, OHIO, ASSIGNORS TO THE MEEHAN BOILER AND CONSTRUCTION COMPANY, OF SAME PLACE.

VALVE.

SPECIFICATION forming'part of Letters-Patent No. 635,051, clatedOctober 17, 1899.

Application filed August 12, 1898. Serial No. 688,452. (No model.)

To aZZ whom it may concern/.- To enable others skilled in the art to make Be it known that we, PATRICK MEEHAN and and use our invention, we will describe the ROBERT GRAY, residents of Lowellville, in same more fully, referring to the accompathe county of Mahoning and State of Ohio, nying drawings, in which have invented a new and useful Improve- Figure l is a vertical section of the inven- 55 went in Valves; and we do hereby declare tion as applied to a furnace for hot-blast the following to be a full, clear, and exact destoves. Fig. 2 is a horizontal section on the scription thereof. line 2 2, Fig. 1, indicating the construction Our invention relates to gasand air valves of the parts and showing the preferred size to forfeeding both gas andairto furnacessuch of air and gas inlets. Fig. 3 is a vertical 60 as boiler-furnaces, l1ot-blast stoves, or like cross-section on the line 3 3, Fig. 1. Fig. 4 structuresits object being to provide a simis a vertical section showing another form of ple and efficient valve which will provide for the valve applied to a boiler-furnace. Fig. the feeding of both gas and air in proper pro- 5 is a like view showing still another form of I 5 portions to support combustion by a single valve embodying the invention. Fig. 6 is a 6 movement of the lever, so that it can becondetail of a modified valve-seat.

trolled by any workman. Like letters of reference indicate like parts It consists, generally stated, in a combined in each figure. I gas and air valve having a horizontal cham- While the invention is illustrated in difher provided with an air-port and a gas-supferent forms, the general principle is the 70 ply pipe openingbyaport into this chamber, same in all-namely, the employment of a the length of the air-port being in proportion chamber having both air and gas ports, the to the gas-port, according to the proportion air-port being proportioned to the gas-port of air and gas to be admitted, and a slidein accordance with the desired proportions valve inclosed within the chamber and slidof air and gas to be fed to the fire-chamber, 7 ing over the gas-port and adaptedin its movethe valve sliding within this chamber over ment to control-what is, to open and close the gas-port and in its movement covering or both the gas and the air ports simultaneously, uncovering both air and gas ports. so that in the movement of the valve as soon In the preferred construction shown in Figs.

as any gas is admitted to the furnaceaproper 1, 2, and 3 the burner is attached to the fur- 8o proportion of air to support the combustion nace A, which can be of any construction, will also be admitted thereto,and as thevalveeither that which is shown, which is the base openings are increased or diminished the of a hot-blast stove, or a boiler-furnace, as proper size of port for feeding the proper proillustrated in Fig. at, or other furnace to which 5 portions of air and gas will be maintained. the same is applicable. The furnace-cham- 85 It also consists in other improvements berhas the entrance-port a, in line with which such, for example, as the employment of a is the valve-chamber b, which is preferably valve of smaller size than the interior of the formed, as shown, in a horizontal position. chamber and having an outlet-opening at This chamber is usually formed of a casting the end toward the furnace, so that the air corresponding in width to the port a or adapt- 90 can pass over the top and sides of the valve ed, as shown in Fig. 4, to fit said port neatly, and mingle with the gas escaping at such and the casting having the top'wall 1), side outlet, so as to cause the proper mingling of walls 12 bottom wall If, and end wall b The the air and gas as they enter the furnacebottom wall 19 is generally formed with a chamber. flat upper surface, upon which the valve 0 95 It also consists in means forlocking or hold rests and over which it travels when in use, ing down such valve as against back presthough, as shown in Fig. (5, a dovetailed con sure within the chamber, which is found in nection (1 may be formed between the valve some cases necessary, especially in hot-blast chamber casting and the valve to hold it stoves. down to place. For generalpurposes,however, 10o

the weight of the valve is sufficient for this purpose, and it need only be held down when it is desired toabsolutelylock the valve--such, for example, as in hot-blast stoves, where the blast is being passed through the furnace-in which case the valve may be locked down by means of the hand-bolt D pressing on the top wall of the valve and binding it down upon the gas-port, or the valve maybe put in-a vertical position when necessary. In the bottom of the valve-chamber are the gas-port e and the air-port f, the gas-port 6 leading up from the gas-pipe e, carrying the gas from any desired source, either from the blast-furnace or from natural or artificial gassupply pipes. The air-port f opens directly to the atmosphere. As seen in Fig. 2, both gas and air ports are rectangular in shape.

. These may be varied to suit circumstances,

the air-port beingin proportion to the length of the gas-port, and the length of these ports can be varied according to the desired supply of air to support combustion of the gas admitted, which of course varies according to the gas used, but is always of greater volume than the gas. The ports are preferably made of about the same width, and therefore as they are uncovered by the movement of the valve they maintain practically the same proportional size of air-inlet and gas'inlet, no matter in what position the valve is placed. The shape of the gas-valve is made clear in the different drawings, the valve having the top wall 0, side walls 0 and the end wall 0 The entrance-port t is formed at the rear end of the valve-body close to the back wall c the valve having the bottom wall 70, which travels over the port a and closes the same, which wall extends out to the mouth g of the valve. In order to control the airport f, the valve has the tailpiece 7t, of sulficient width to cover the air-port, which extends over said port and acts to open or close the same as the valve is moved. It will be noticed that between the top wall I) of the valve-chamber and the top wall 0 of the valve and between the side walls of the chamber and the valve that full space is provided for the flow of the air entering from the air-port 50 f over the top of the valve-body and that there is no opportunity for the mixing of the gas and air until they pass the front end of the valve, where the gas escaping through the mouth 9 can mingle with the air passing over the valve, when the gas, being lighter than the air, will mingle therewith, and the mingled gas and air will pass into the furnacechamber A. For the purpose of moving the valve any suitable device may be employed. For example, where the valve is employed with a hot-blast stove and the parts are subjected to pressure the valve-rod m may extend out through a stuffing-box m in the rear wall 6 of the valve-chamber, at which In the use of our invention as embodied in the construction shown in Figs. 1 and 3 and when used with a hot-blast stove when the furnace is to be lighted the valve is moved forward by its rod 'm, permitting the entrance of gas and air through the ports e and fin the desired proportion, and the gas is ignited and burns within the furnace-chamber A, and the heat in said chamber is regulated by the slidevalve, as desired. The gas and air mingle at the mouth of the valve, asabove described,

and burn in said chamber, being under full control of the workmen by the simple sliding of the single valve. As the valve is slipped forward it opens or uncovers both air and gas ports, and on account of the difference in size of the two ports proper portions of gas and air are fed to the chamber. When it is desired to carry air through the hot-blast stove, the gas and air supply are cut off by the drawing of the valve back, so as to close the ports e and f, and in order to prevent the escape of air from the hot-blast by the entrance of gas, if its pressure should be higher than that of the air, we prefer to screw down the hand-screw D, forcing the valve into close contact with the bottom of the valve-chamber and so positively'closing the valve-ports. The valve can be quickly opened by the running up of the screw D and the movement of the valve in its chamber, as above described. The construction shown in Fig. 4 of the drawings is practically the same as that above described, except that the air-port n is made in the rear wall a, and this port is closed by the rear wall 19 of the sliding valve p, and the lever r is connected directly to a strap 1", which is connected to the valve-body through said port n,.and the valve can therefore be easily moved without the necessity of the employment of a stuffing-box. The construction shown in Fig. 5 is also the same as those above described, except that the valve is opened by a backward movement instead of a forward movement, and so doing forms an air-port at the end of the valve-chamber. For example, the valve-chamber s is open at the rear end and the valve 25 has projecting upwardly from it the plate or extension 25', which closes the space above the valve-body, fitting against the open end of the valve-chamber s. The valve has also the bottom wall 25 covering the gas-port o, and the port t which by the backward movement of the Valve-body is drawn over the gas-port o and so admits gas to the valve, the valve-body having also the mouth to, at which point the air entering at the open end of the valve-chamber mingles with the gas entering from the gas-port Q) into the valve. This valve can be operated in the same way as the other valves by a simple 1ever or like connection, and it gives the same control both of gas and air ports, differing only in the direction in which it is moved.

In either form of the valve employeda very simple valve is provided and one which on account of its simplicity is not liable to injury by the heat of the furnace, while by a simple movement of the single valve in either direction the control of both gas and air in proper proportions for combustion is provided.

What we claim as our invention, and desire to secure by Letters Patent, is-

1. A combined air and gas valve having a valve-chamber provided with air and gas ports, and a slide-valve inclosed Within the valve-chamber and opening toward the furnace-chamber, whereby there is space at top and sides of said valve for the passage of air, said valve sliding over the gas port and adapted in its movement to control the airport, substantially as set forth.

2. A combined air and gas valve having a valve chamber provided with gas and air ports, the air-port being proportioned to the length of the gas-port, and a slide-valve Within said chamber having a body of smaller size than the chamber, said valve sliding over the gas-port and controlling both gas and airports in its movement, substantially as set forth.

A combined gas and air valve having a valve-chamber provided with an air-port, and with a gas-port opening through the base thereof, and having a slide-valve of smaller.

size than the chamber, and inclosed within and contacting with the base thereof, said valve having closed top, side and end walls and a mouth opening toward the furnace,-

chamber, and having a port controlling the gasentrance, substantially as set forth.

4-. A combined gas and air valve having a valve-chamber provided with gas and air ports in the base thereof, the air-port being proportioned to the gas-port, and a slidevalve inclosed within and sliding over the base of the chamber, said valve having a solid top, side and rear walls, a port in its base for the entrance of gas, and an open mouth at its forward end, and having a tailpiece extending over the air-port, substantially as set forth.

5. A combined air and gas valve having a valve-chamber provided with gas and air ports and a slide-valve inclosed therein, and contacting with the base thereof and sliding over thegas-port and controlling the air-port, said valve having solid top, side and end walls, and an open mouth toward the furnace, and a hand-screw passing through the top of the valve-chamber and contacting with the valve-body, substantially as set forth.

In testimony whereof we, the said PATRICK MEEHAN and ROBERT GRAY, have hereunto set our hands.

PATRICK MEEHAN. ROBERT GRAY.

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