US350650A

US350650A - Valve

Info

Publication number: US350650A
Authority: US
Publication date: 1886-10-12
Anticipated expiration: 1903-10-12

Description

(No Model.)

B. P. WILLIAMS.

VALVE.

No. 350,650. Patented Oct. 12, 1886.

lei/yin FMG'IZI'Q, n1 6 UNITED STATES PATENT i FFICE.a

VALVE.

SPECIFICATION forming part of Letters Patent No. 350,650, dated October 12, 1866.

Application filed December 17, 1885. Serial No. 186,005. No model.)

To all whom it may concern.-

Be it known that I, EDWIN F. WILLIAMs, a citizen of the United States, residing at- Ohicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvementin Val ves, which is fully set forth in the following specification, reference being had to the accompanying drawings, in which- Figure 1 is a central longitudinal sectional view through the main and cutoff valves and their seat; Fig. 2, a front end elevation, a portion of the main valve and its seat being broken away to show the construction; Fig. 3, a longitudinal plan section taken on the line :0 :r, Fig. 1, and Fig. 4 a transverse sectional view taken on the line 3 y of Fig. '1..

Like letters refer to like parts in all the fig ures of the drawings.

Myinvention relates to valves for steam-en gines, and more particularly to that class known as balanced valves, provided with cut-off valves, its object being to provide a valve especially adapted for use in conjunction with high-speed engines, wherein the steam may have a free and unobstructed passage through the valve to the cylinder, while at the same time the cut-off valve shall be arranged so as to act with the maximum efficiency.

I will now proceed to describe a construction in which I have practically carried. out my invent-ion in one form, and will then point out particularly in the claims those features which I deem to be new and desire to protect by Letters Patent.

In the drawings, A represents the valveseat, provided, as usual, with the steam-chair nelsa, leading to the cylinderends, and with the exhaust-passage a, arranged centrally between the two. Supporting-pieces A arise from each side of the seat, and have arranged upon them, in any approved manner,thc pressure-plate B, This pressure-plate is provided on its under side,near each end,with channelsb,corresponding to the channels a of the seat A,and with a central channel, Z), corresponding with the exhaust-passage A.

0 represents the main valve, which is supported and guided by the valve seat and sup port A in an obvious manner. This valve is provlded at each end with duplicate ports 0 and 0, extending from top to bottoniof the valve, the former being open at the end, in order to connect it with the interior of the steamchcst. In addition to these duplicate ports at each end the valve is provided with a central exhaust passage or port, 0, extending from top to bottom.

D indicates the cutoff valve, which is arranged within and inclosed by the main valve. In the present instance this valve is shown as consisting of a rectangular frame,composed of two cross-bars, (l, of sufficient size to close the ports a in the main valve when in proper position, these cross-bars being arranged in recesses D in the mainvalve, as clearly shown in Fig. 1 of the drawings. These cross-bars d are connected by side bars, (2, and also by means of the cut-oii' valve-rod D, which passes through the hollow main valve-rod O, as shown in Fig. 11. lVhen this form of cutoff valve, constructed in a single piece, is employed, the main valve is constructed in two parts, divided horizontally at or near its center, in order to enable the cutoff valve to be placed in position within it, the two parts being secured by bolts 0.

The operation of Iny improved valve is as follows: lVhen the valve is in the position shown in the several figures of the drawings,

the steam entering the space D through the open front end of the main'valve will travel in the direction of the arrows, as shown in the several figures. A portion of the steam will pass down through the forward port, 0, into the steam-channel a, direct communication be tween the two being established through the lower opening of the said port 0. The steam will also pass through the upper opening of the port 0 into the channel I) in the pressure plate, and through this channel itwill pass into the port 0, and down through the said portinto the steam-channel (I, as indicatedby the arrows iI1.Fig. 1. It will be observed that the steam thus has a double passage through the valve into the steam-channel both from above and below, thus admitting a larger amount ofsteam than would be possible ifa single port were only used. At the same time the exhaust steam passes up through the rear channel, a, into the space 0* in the valve, and thence out at the exhaustpassage a, as indicated by the arrows in Figs. 1 and 4. In addi'tion to this direct passage of the exhaust- ICC steam it also, at the beginning of the stroke,

passes up through the rear port, 0, into the rear channel, I), in the pressure -plate, and thence through the passage 0 into the exhaustpassage a, thus providing a double passage through the valve for the exhaust also. The cutoff valve will operate to close the ports of the main valve, through which steam is admitted to the cylinder, in an obvious manner,

it being operated by the usual cut-oft eccentrio to stop the flow of steam atthe proper moment by moving in such a manner as tocause one of the cross-bars d to close the port a, through which steam is passing at the time.

It will be seen that while double passages are left at each end of the valve to admit and exhaust the'steam, the arrangement is nevertheless compact and simple, the cut-off valve being so located as to take up but little space, and, in fact, no additional space.

It is obvious that various mechanical modifications in the details of construction may be made without departing from the principle of my invention. For instance, although I have shown the main valve as constructed in two parts to receive the cut-off valve, which latter is constructed in a single piece, it is obvious that this arrangement may bG'l'GVBlSGd i. e., the main valve may be made in asingle piece, while the cut-off valve is so constructed that the cross-bars d are independent, and may he slipped into placeand subsequently connect ed by through-bolts.

. Various other modifications may be employed, and I therefore do not wish to be understood 'as limiting myself strictly to the precise details of construction hereinbefore described, and shown in the drawings.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a slide-valve for steam-engines, the combination, with the valve-seat and its steam and exhaust channels, of the pressure-plate provided with corresponding channels, the main valve provided with duplicate ports at each end, andthe cut off valve arranged within the main valve, substantially as and for the purposes specified.

2. The combination, with the valve-seat and pressure'plate provided with steam-channels, as described, of the main valve provided with ports 0 and c at each end, and the cut off valve D, arranged within the main valve and adapted to close the portsc alternately, substantial] y as and for the purposes specified.

3. The combination, with the valve-seat A,

provided with steam-channels a and exhaustpassage a, of the pressure-plate provided with channels I) and b, the main valve provided at each end with ports 0 and c, and central passage, c", and the cut-off valve D, arranged within the spaces D in the main valve, substantially as and for the purposes specified. EDYVIN F. \VILLIAMS. Witnesses:

IRVINE MILLER, ADELLE L. PHAR