US292261A - Slide-valve - Google Patents

Description

H-. P. SHAW-.vh

SLIDE VALVE.

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Patented Jan. '22, 1884..

lFig. 1.

"UNirenn-l STATES PATENT @Pereira HENRY F. SHAW, onnosron, MASSACHUSETTS.

' SPECIFICATION forming part of LetterslatentNo, 292,261, dated January 22, 1584.7,

Application tiled Junel4, 1853. (No model.)

" yiin the county of Suffolk and State of. Massacl1u setts, haveinvented certain new and usefulImprovements in Slide-Valves, of which the following is a specification,reference being had i to the accompanying drawings.

The-object of `my invention vis toV produce a slide-valve which shall-` provide, atthe instantr of 'opening a Sport, a greater opening for the passage ofsteam than is done by means of the Ordinary slide-valve, and also to produce a combined valve adapted for two cylinders having pistons plying therein in opposite directions, said valve beingeonstructed to provide, particularly, free and unobstructed exhaust-passages.

My invention consists in so forming thesides `or edges ofthe openings of the valve a'nd'valveseat that the open passages will be irregular or zigzag in shape, in distinction from openings having their longitudinalsides rectilinear; and, also, in the combination of a B-valve and D-valve joined together to be operated as one valve with the valve-seat, the valvean'd valve-seat having steam-passages formed and located with reference to each other as hereinafter set forth. j

In the drawings, Figures l and 2 are plan views of a valve and valve-seat embodying my invention, the valve being shown in two different positions on the seat. Fig. 3 is a plan view of the seat, the valve having been removed. Fig. Il is an outline of the face of the valve. Fig. 5 is a section of valve and valveseat on line 1 l; and Fig.I 6, a section of valve and valve-seat on line 2 2 in Figsa and 4, the valve beingin the position on the seat as illustrated in Fig. 1. Fig. 7 is a diagram for more particular reference hereinafter.

The valve-seatA has a port, a, to lead to one end of one of two cylinders, a port, b, to

lead to the opposite end of the same cylinder, a port, c, leading to one end of the other ofv the two cylinders, anda port, "d, leading to the opposite end of the latter cylinder. There isa common exhaust port and passage, e, through the length of the seat. The cylinders are supposed to be located side by side, and the valve and valve-seat over the space between the cylinders, or over the adjoining k.

sides of the saine, the face ofthe seatandvalve being thus brought into a horizontal plane, Y

/the steam passes from either of the ports aZ and b to the exhaust-port e.- That partof the valve B which corresponds to a B-valve has openings h and z' in its face, leading to a chamJ-f ber, j, in the valve, through which live steam passes from the steam-chest to the port c, and exhaust-steam from the port c to the exhaust-v porte, and has openings 7c and Zin its face,

leading to a chamber, m, in the valve', through which live steam passes from the steam-chest to the port d, and exhauststeam from the port d to the exhaust-port e. Live steam enters the port c above the seat at and opposite the edge n of the valve, and the port b at and opposite the edgeo of thevalve.- Live steam enters the opening It under the valve at and opposite the edge p of the seat, and the opening Z at and opposite the edge q of the seat. The

inner longitudinal edges and edge faces -of the sides of the ports a and b, opening f, openings h and Z, and outer longitudinal edges and edge faces of the sides of the ports c and cl are.4

grooved, whereby there are formed grooves fr and projections s at the above-named edges and edge faces of the valve, and grooves t and projections u at the named edges and edge faces of the valve-seat. Said edges are at the sides of the passages formed in the working of the valve for the eXhaust-steamto the chambers in the valve. valve is opposite a groove in the seat, and consequently each projection on the seat is opposite a groove in the valve, and the projections vand grooves have a like contour, so that an opening between two edges so formed has a shape represented at o in Fig. 7. 'Through such an opening, especially when the zigzag passage is of slight width, as it is at the commencement of making the same, I believe more steam will pass than through a straight passage-that is, one having rectilinear sides.

I do not confine this part of my invention to anyparticular form of projections and grooves,

Each projection on the' IOO degree Whatever the form ol projections and grooves may be, provided they correspond to each other. s

In the drawings is illustrated provision for this irregular or zigzag passage for the exhaust only; but such may also be employed for the live steam.

It will be seen that when the exhaust-steam is about to be admitted to either` of the chambers j and m, and either of the ports c and d is about to be opened, the corresponding opening, t' or k, in the valve is Well over the exhaust-port e. This is an important feature in my invention, since the :flow of the exhauststeain is not retarded,as it would be were the passages from said chambers to the common exhaust-port, e, opened at the same time that the ports c and d were opened.` By this arrangement of the passages and construct-ion of this part of the Valve, as shown, I provide for ample lead7 in the part ofthe valve corresponding to a B-valvc for the exhaust-steam, and Very free passage for the egress of the same.

I claim as my invention- 1. In aslide-valve and seat therefor,openings the sides ofwhiehhave projections and grooves i`11 their edges or edge faces, whereby one or more passages across the plane of contact of valve and valve-seat are irregular or zigzag in shape, substantially as specified.

2. In combination with the chambers j and m, openings h i and LZ in the Valve, and ports c, d, and e in the seat, said openings and port-s being so located with reference to each other that either of the openings t' and 7c is well over the port e when that one of the openings 7L and l leading to the same chamber is about to enter upon the corresponding one ot' the portsc and d, substantially as shown and specified.

3. A valve consisting of two parts, one of said parts corresponding to a D-valve, and the other of said parts corresponding to a B- valve, the edges of passages and ports presenting projections and grooves, to provide one or more passages across the plane of contact of valve and valveseat of an irregular or zigzag shape, as set forth. I

4. A. valve, being a combination of a D- val ve and a B-Yalve, the openings iu that part of which' that corresponds to a B-valve and the ports in the seat therefor are located in such relation to each other that when the opening leading from either of the two chambers is well over the common exhaust-port in the seat the port leading from the seat to the saine chamber in the valve is about to be opened, substantially as and for the purpose set forth.

HENRY Ff SHAW.

Witnesses:

GEO. R. Gorcnox, EDW. Dumme.

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