US304751A - Rotaby valve - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

G. H. POOR.

ROTARY VALVE. No. 304,751. Patented Sept. 9, 1884.

Inven Z01 2 Sheets-Sheet 2.

(No Model.)

.G. 'H.POOR.

ROTARY VALVE.

Patented Sept. 9, 1884.

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GEORGE H. POOR, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE AMERICAN BRAKE COMPANY, OF SAME PLACE.

ROTARY VALVE.

SPECIFICATION forming part of Letters Patent No. 304,751, dated September 9, 1884.

Applicationfiled April 7, 1884. (No model.) I

To aZZ whom it 7220,1 concern:

Be it known that I, GEORGE H. Poon, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Rotary Valves; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which- Figure l is a vertical central section of a valve embodying my invention. Fig. 2 is a horizontal section through the cover of the valve-chamber, showing the top of the valve. Fig. 3 is a bottom view of the valve. Fig. 4

is a top view of the lower section of the shell, showing the valve seat and ports. Fig. 5 is an elevation of the valve; and Fig. 6 isa horizontal section of the shell just below the valveseat, showing the relation of the induction and eduction (or exhaust) ways.

Like letters refer to like parts wherever they occur.

My invention relates to the construction of rotary valves for controlling the flow of gases,

vapors, or fluids, andwhile I shall hereinafter, for purposes of convenience, refer to it as a steam-valve, I do not propose or intend to be limited to such an application of the invention.

The main points of novelty which characterize this invention are as follows: First, the ingress and egress ports are all located under and open inside the valve proper, which fa cilitates the balancing of the valve, said valve being concave or of cup form; secondly, the

stem or support of the valve-chamber is utilized as an exhaust-port, which reduces the number of openings necessary in the side of the shell; and, thirdly,the stops or lugs which 40 limit the movement of the valve are placed within the shell, where they are positive in their operation, and cannot be tampered with.

There are minor points of novelty, which will hereinafter more fully appear.

I will now proceed to describe my invention, so that others skilled in the art to which it appertains may apply the same.

The valve chosen to illustrate my invention is a three-way valve which I have devised for use with locomotive and tender brakes.

The valve shell or casing may consist of two valve to be constructed.

sections, the lower section, A, containing the ingress and egress ports and the valve-seat,

while the upper section or cover, B, forms a live-steam chamber above the valve proper, for balancing the same. The shell A has a centrally-located vertical annular wall or diaph ragm, p,which divides the exhaust-passage from the body of the shell-chamber, said annular diaphragm or wall terminating below inthe hollow stem I, by which the casing is supported. The wall 1) is perforated above,to communicate with a shallow radial chamber,

d, that has a port, (I, through the valve'seat. The hollow stein P is threaded to give sup- 6 port to the shell on a bracket or other desirable support, and also to allow of securing an exhaust-pipe thereto by means of a coupling or other approved means. The interior of shell A, surrounding this exhaust-port is divided,by vertical radiating diaphragms m,into two or more chambers, (in the present instance three,)1 2 3, according to the character of the The main chamber 1 is that which receives the live steam, and is 7 5 provided with an ingress supplyport, a, and

a port, a, through the valve-seat A. The lesser chambers 2 and 3 are each provided with its port I) 0 through the valve-seat, and with eduetion-ports b 0 through the shell-sec- 8 tion A. The chambers 1 2 3 d are closed above by the valveseat A, which is ground and finished in the usual manner, and is pierced by the ports a b 0 (Z, as before specified. The section A is provided with a thread- 8 5 ed flange, r, for the spanner-nut q, and the edge of the valve-seat A is ground off beveling, as at z, to form a close joint with the cover-section B.

13 indicates the upperor cover section of the shell, provided with a port for the valvestem, surrounded by a stuffing-box, Z, and a gland-nut, m. The lower edge of the shell has a plain outer flange, s, to engage with a spanner-nut, q, and abeveled inner edge, 15, to form 9 5 a ball-joint with the edge of the valve-seat of the lower section. On the interior of coversection B is a projection or lug, 71', which engages with like lugs on the top of the valve and limits its motion, and the position of this lug 7a with relation to the valve and valveports is insured by means of a dowel-pin, u,

on the flange 8, (see Fig. 2,) and a hole therefor in the flange r of the section A.

6 indicates the valve which is concave upon its under surface, said concavitybeing divided by radial bars or partitions g 9 into chamber or recess 0 for live steam, and chamber f for covering ports I) c d of the Valveseat.

J indicates ahole or port in the top of chan1- ber c to admit live steam into shell B above the valve 0 0, so as to balance the valve by equalizing the pressure on the upper and under surface. This port is preferably made as low down as possible, so that the chamber above the valve may readily free itself of any water of condensation. Upon the upper surface of valve 0 are lugs or projections h 72, which form a recess for the reception of the foot of the valve-stem, and also lugs or projections 2' i, which, in conjunction with the projection k on the inside of shell-section B, limit the rotationof the valve. The lugs i i are so located with relation to the chamber or recesses cf of the valve that the relation of said chambers to the ports a Z) c d is always preserved.

a indicates the valve-stem, which projects through the stni'lingboX Z of cover-section B, is provided above with a suitable handle or hand wheel, and below with a foot, 0, or equivalent means, engaging with and operating the valve 0. The several ports being of the character specified, the stem nis passed through the stuffing-box Z, the valve 0 is arranged on the valveseat, with the chamber or recess f over the ports I) c Z,the cover-section B is applied,with the lug 7|; between the lugs '6 z" of the valve, in the position substantially as shown in Fig. 2. A packing, if desired, is arranged between the sections A B, and the spanner-nut q is screwed home to secure the parts, which brings the ball-joint or ground surfaces t t together, making a steam-tight joint.

In describing the operation of the devices we shall suppose the valve to be applied to use in conjunction with a locomotive and a tender-brake, a being the opening through which the steam enters the shell; I), the egress leading to the cylinder of thetender-brake; c, the egress leading to the cylinder of the driver-brakes, and d the hollow stem forming the exhaust-passage. It will be noted that all these openings are in the lower section, A, of the shell. The operation of the devices will then be as follows: The live steam which enters by a into chamber 1 will pass through port a of the valveseat into chamber orrecess e, and through hole j in the valve into shellsection B, above the valve C, so as to measurably equalize the prcssure and partially balance the valve. If, now, the valve 0 be rotated so that bar 9 just passes over port I), the steam will pass through port I) into chamber 2, and by egress b to the cylinder of the tenderbrakes. If the valve is still further rotated in the same direction until the bar 9 just passes the port 0, the steam will then pass from recess a through port 0 of the valve-seat into chamber 3, and thence by egress 0 to the cylinder of the driver-brakes. The reverse movement of the valve passes bar 9 back over port 0 and permits the steam from the driver-cylinder to exhaust through chamber 3, port 0, recess f, port (1, and way d into the hollow central exhaust; and a still further reverse movement of the valve carries the bar back over port b of the valve-seat, and permits the steam from' the tender-cylinderto exhaust through chamber 2, port Z), recess f, port (1, and the central exhaust-passage, d. It will be noted that in this application of the valve the arrangement of the ports and connections is such that the tender-brakes are the first to be applied and the last to be released. This is of special advantage in applying brakes to trains in slowing down or taking up the slack of a long train preparatory to applying a powerful driver-brake, and therefore has been here mentioned, but without the intention of limiting the manner in which the arrangement of the connections shall be made.

The advantages of my invention are, first, that all the steam-ports being located under the valve proper, a partially-balanced valve is obtained by simple means, and also one which will readily free itself from any water of condensation; secondly, the forming of the shell stem or support hollow reduces the number of external openings required in the shell-section; and, finally, the arrangement of the stop-lugs within the valve-shell prevents any tampering with or disarrangement of the valve.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. In a valve, the combination,with a valveseat having both ingress and egress ports therethrough, of a rotary cup-valve which receives and discharges the steam continuously from or through the same chamber of the valve, substantially as and for the purposes specified.

2. Avalve having two chambers or recesses opening downward or toward the valve-seat, in combination with a valve-seat having'an ingress-port opening upward through the seat into one of such chambers or recesses, and an egress port or ports opening downward through the seat from one or the other of said recesses or valvechambers, according as the valve is turned to the right or left, substantially as and for the purpose specified.

3. A valve having lugs on the valve and on the interior of the valve-shell, to limit the movement of the valve substantially as and for the purpose specified.

4. A valve-shell having a hollow supporting-stem, which is arranged to form a steamway for the valve, substantially as and for the purposes specified.

5. A shell having the central and the radiating passages which open through the valve seat from. below, and the rotating cupped valve having the recesses or chambers on its under surface, substantially as and for the purposes specified.

6. The shell-section having the hollow stem, said section divided into two or more chambers having ports through the shell and through the valve-seat, a valve-seat which closes the chambers of the shell, and a rotating valve having two recesses on its under surface and a port through its walls to admit pressure to the upper surface of the valve, substantially as and for the purposes specified.

7. The combination, with a valve-seat having its several ports, of a valve having recesses on its under surface and lugs or stops on its upper surface, and a shell having a lug or projectionon its interior to engage with the lugs on the upper surface of the valve, substantially as and for the purposes specified.

In testimony whereof I affix my signature, in presence of two witnesses, this 12th day of March, 1884.

GEORGE H. POOR.

\Vitnesses:

E. B. LEIGH, I. W. MoMUNN.

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