US700985A - Balanced valve. - Google Patents

Description

Patented May 27, |902.

E. B. SINTZENICH.

BALANGED VALVE.

(Application filed July 2B, 1900.)

(No Model.)

Uivrrnn Srnrns .WENT OFFICE.

EDVIN B'. SINTZENICH, OF ROCHESTER, NEV YORK.

BALANCED VALVE.

SPECIFICATION forming part of Letters Application filed July 28, 1900.

To all whom. t may concern.-

Be it known that I, EDWIN B. SINTZENICH, a citizen of the United States, and a resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Balanced Valves, of which the following is a specification.

The invention relates to balanced valves for steam-engines, pumps, air-motors, &c. Its object is to produce a means of balancing a slide-valve by means that are easily attached to it and to provide means for packing the balancing mechanism or to prevent the escape of steam therefrom.

The invention consists in the mechanism hereinafter described and claimed.

In the drawings, Figure l is a vertical longitudina lsection through the ports and steampassages of a cylinder and through a slidevalve having one or more balancing devices attached thereto. Fig. 2 is a top plan view of one-half of a modified form of one of my balancing devices, and Fig. 3 is a vertical cross-section on the diameter of the mechanism shown in Fig. 2.

The mechanism herein shown will be described as applied to the slide or D valve of an ordinary steam-engine cylinder, although the device is capable of application to other constructions by means within the skill and knowledge of those acquainted with the art of motors and pumps of various kinds.

In Fig. l is a portion of the cylinder of an ordinary steam-engine. o. is the exhaust-port thereof. a a2 are the steam-ports. B B are the side walls of a steam-chest. B is the steam-chest cover. h is the valve-rod. C is the slide-valve, which may be of usual form, or, as shown in the drawings, it may have extended iianges c c on the ends, perforated at c c', with ports adapted to register at the ends of the stroke of the valve with the steam-ports C1. 0.2. The lengthening of the D-valve C, as just described, is for the purpose o f giving a firmer base on which the valve rests and to tend to prevent a lifting or tipping of the Valve. The side walls B B of the valve-chest are or may be higher than usual in order to accommodate the balancing mechanism now to be described. On the top of the D-valve C is fastened a box E, that is connected with the interior cavity of the valve C by a proper Patent'NoL 700,985, dated May 27, 1902.

Serial No. 25,127. (No model.)

passage. In the present instance this passage is a small bore e through a bolt E, that fastens the box E to the valve-seat. If now the pressure within the box E is the same as within the valve C, the valve C would become balanced and there would be no tendency of thevalveto rise from its seat, nor would there be any pressure of the valve C downward on its seat except the mere weight of the valve. This will be the case if the box E is made steam-tight and the pressure in the steam-chest is excluded therefrom. The top B of the valve-chest is used as Ithe stationary surface just mentioned, and I produce a steam-tight connection as between the box E and the lsteam-chest cover B by the following means: The box E is made cylindrical on the outer side of theftlange e, and around this cylindrical surface is placed a packingring f, that is capable of movement up and down around the flange e. The inside face of the steam-chest cover and the upper edge of the ring f are surfaced to fit closely, and the said ring is lifted by means of a spring f pressing against the iiange e0 on the box E or, if desired, pressing upon the top of the valve C, which raises the ring f into ycontact with the under surface of the valve-chest cover B. The ringfis split in order to expand and contract and to tit upon the outer surface of the flange e. VOn the inner sur` face of the ring is cut a groove fo, which ends at points adjacent to where the ring is split, so that the groove fonwhen the ring f is tted upon the flange e constitutes a steam-tight cavity. On the lower edge ot' the ringfis cut another groove fo', that, like the groovefo, ends adjacent to the point where the ring is split and forms another steam-tight cavity. These two grooves fo and fo/ are connected by one or more passages foi. Beneath the ring f is a base for supporting the packing, consisting in the present instance of a second ring f2, that fits against the lower surface thereof and which the spring f presses against the lower edge of the ring j". On the outside of the ring f is another thin ring f3, that is also split and is so set on the ring fthat the split of the last-mentioned ring is covered by the ring f3. Of course the steam is led into the steamchest and pressure therein is the boiler-pressure. Under this pressure steam passes into IOO the cylinder through the port c' and the passagey a in the vposition of the parts shown in Fig. l to one end of the cylinder. From the other end of the cylinder steam passes out throughthe passage a2, valve C, and exhaustpassage a in this same position offparts. If the area within the packing-ringfis equal to the area of the open ports under the central cavity of the valve C, there would be perfect 'Inasmuch as the pressure in the valve-chest is greater than that under the valve C or inside the balancing device, this pressure Will tend to lift the'ringfzagainst the lower edge ofA the ringfand by reason of the groove f and passage]E02 will cause `the ringfz to hug the bottom of the ringf very closely. So,

also, the pressure upon the split ringf3 will cause it to fit closely upon the fiange e. This operation is arrested in the case of the rings f2 and f3 by the grooves fo' and fo, which act as if they Were open ports under (as to the pressure) the ringf2 and the ring f, whereby there is a greater surface for the action of the outside steam-.pressure than there is on the inside of said rings, the same being diminished to the extent of the area of the groovesfo'andfo. The action of these grooves thus described becomes eective by reason of'passages e0 through the fiange e, which connect the interior of the balancing device with both grooves fo and fo, being connected with the first through the passage or passages fm. It will be noticed that the inner upper edge of the ring ff is recessed or grooved, as atfo, the purpose of this being to cause it to tend to hug the steam-chest cover B more vclosely on account of the increased surface for operation of the outside steam-pressure over'the surface of the ring f, which takes the pressure against the steam-chest cover. Thismechanism is found to be effective and tof remain steam-tight, and by reason of the higher pressure in the steam-chest outside ofthe valve C and the balancing devices over the pressure within the balancing device and inside the valve C the pressure of the valve upon its seat is reduced and said pressure is variable in accord with the pressure of the exhaust inside the valve C, which pressure of the exhaust is increased or reduced inside.

the balancing device by reason of the communicating passage e.

In Figs. 2 and 3 there is shown a modified form of the same mechanism in which the ring f is surrounded by another split ring g, outside of which is placed the ring f3. The

ring Gfhas a groove Q0 around its lower edge corresponding to the groovefo. One or more passages Q02 connect the groove go With a groove Q03 on the upper edge of the ring g, and

Aone or more passages g04 connect with a passageor passages fo* in the ringf. This pastight it of the movable ringsfand g against the steam-chest cover; but upon employing the grooves and relief-'passages leading from -them the steam-tight fit of the rings on the box E and upon the steam-chest cover is found to be perfect and to have movement to produce a tight fit and the exclusion of the steam in a way which does not occur Without them.

The out-side ring]3 may have, as shown in Fig. 2, a protecting-plate fw, that is fastened in any suitable manner, as by a screw 731, to one end of the ring near Where it is split, said plate passing over the split and being held against the opening at the split by the steam-pressure in the steam-chest.

In the top B of the steam-chest is a hole b', filled by a movable plug 510. When this plug is removed, the pressure in the interior of the balancing device is always the same as the atmosphere and avoids, among other things, the disturbing effect of back pressure from the cylinderinto the D-valve. With this construction the bore c may be closed by a plug elo, or the bolt E may be made solid. When the usual form of riding cut-o is employed, the balancing device usuallyy has no uidpressure connection with the D-valve, but is merely fastened thereon, and the hole b is left open.

The box E rests, as shown, on the back of the D-valve (l, and so much of the box as rests in contact therewith of course precludes steam-pressure on so much of the valve. I prefer to leave some space between the bottom of the box E and the back of the valve in order that the steam-pressure in the steamchest, which of course acts in all directions, may get under the box and exert a lifting action which relieves the pressure of the valve C against its seat. The area of surface of the under side of the box E thus exposed to the steam-pressure should be greater than the surface of the open ports under the valve C.

It will be seen that this balancing device may be applied to any of the usual forms of slide-valve without change, except that in some cases the steam-chest has to be increased in height and the under side of the steamchest cover must be surfaced.

What I claim is-'- l. In abalanced Valve, a cylinder havin gin- IOO IIO

let and exhaust ports,a slide-valve forcausing inlet and exhaust of steam to the ends of the cylinder, a stearnfchest, a box secured to the back of slide-valve and a movable metallic packing supported on a base on said box and fitting the exterior of said box and against the steam-chest cover and having one or more grooves on its surfaces in contact with said box and said base and open passages from said grooves to the interior only of said box, substantially as described.

2. In abalanced valve, a cylinder having inlet and exhaust ports,a slide-valve for causing inlet and exhaust of steam to the ends of the cylinder, a steam-chest, a box secured to the back of the slide-valve, and a movable inetallic packing supported in a base on said box and fitting the exterior of said box and against the steam-chest cover and having one or more grooves on its surfaces in contact with said box, said base and said steam-chest cover, and open passages from said groove to the interior only of said box, substantially as described.

3. In a balanced valve, a cylinder having inlet and exhaust ports,a slide-valve for causing inlet and exhaust of steam to the ends of the cylinder, a steam-chest, a box secured to the back of lthe slide-valve, and a movable me- Tallic packing supported on a base on said box and iitting steam-tight against the outer surfaces of the box and against the under surface of the steam-chest cover and upon said base, means for pressing said base upward against the steam-chest cover, said packing having grooves on the surfaces pressing against said box and said base, and open connections from said grooves to the interior only of the box, substantially as described.

4. In a balanced valve, a cylinder having inlet and exhaust ports,a slide-valve for causing inlet and exhaust of steam to the ends of the cylinder, a steam-chest, a box secured to the back of the slide-valve, and a movable metallic packing supported on a base on said box and fitting steam-tight against the outer surface of the box and against the under surface of the steam-chest cover and upon said base, means for pressing said. base upward against the steam-chest cover, said packing having grooves on the surfaces pressing against the steam-chest cover, said box and said base, and open connections from said grooves to the interior only of the box, substantially as described.

EDWIN B. SINTZENICII.

Witnesses:

C. M. PERKINS, F. BISSELL.

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