US143807A - Improvement in valves for steam-engines - Google Patents

Description

2 Sheets--Sheet 1.

A. CARR. Valves for S'tea'm-Engin'es.

Patented Oct. 21,1873.

- 1 [A444 11 @ZM ZISheetS--Sheet 2.

y A. CARR. Valves for Steam-Engines.

Patented Oct. 21,1873.

ILIAIIL UNrrnD STATES ATENT FFICE.

ADAM CARR, OF PATERSON, NEV JERSEY.-

IMPROVEMENT IN VALVES FOR STEAM-ENGINES.

specifi-ation forming part of Letters Patent No. 143,807, dated October 21, 1873; application filed August 1,1873.

To all whom it may concern.:

Be it known that I, ADAM CARR, of Paterson, in the county of Passaic and State of New Jersey, have invented an Improvement in Valvesfor Engines, of which the following is a speciiication:

This invention is an improvement upon that set forth in Letters Patent Nos. 105,986 and 110,294, and the improvement relates to the arrangement of the ports and passages of the valves and valve-seat.

In the drawing, Figure 1 is a vertical section of an engine fitted with my improvement. Figs. 2, 3, 4, and 5 are sectional views, illustrating the movement of the valves. Fig. 6 is a plan of the valve-seat. Fig. 7 is a sectional view at the line y y, Fig. 6; and Fig. 8 is an inverted plan of the main and secondary valves. Fig. 9 is a similar view of the main valve without the secondary valve.

The cylinder a, piston c', piston-rod f, tappet a', lever a, and connecting-rod t are similar to corresponding parts in aforesaid patent, and said rod t gives a positive movement to the secondary valve i, iirst in one direction and then in the other, as the lever a is moved by the tappet u striking its respective ends. The rod t, however, passes into the steam-chest through a stuifmg-box. The secondary valve iis in a frame, c, to which the rod t is connected, and said valve is independent of the main valve o, but slides in a groove therein between it and the valve-seat upon the cylinder a. The pistons r r. give movement to the valve 0, and said pistons move in cylinders g1.

g2 in the steam-chest p. The steam passes to thisv chest p by the pipe lw and one of the ports 8; and said ports are always open, as the valves do not move ,sufficiently far to cover them. These ports S are in the cylinder a, and there are connections upon both sides of said cylinder for the pipe w or exhaust-pipe in; hence they can be connected to whichever side of the cylinder ay is most convenient, the openings in the other side being closed by-screwplugs, as at w nv. VThis arrangement allows for removing the steam-chest without disconnecting either the steam or exhaust pipes.

The operation of the steam-valves is as follows: Referring to Figs. 1 and 2, the piston .'a/ is movin g in the direction of the arrow, and steam is being admitted to the cylinder a by the port 3, and the exhaust passes yby 2 to 4 through the main valve o, Fig. 2. Steam is sluit off to the cylinder g2; but the exhaust from g1 is open through the ports 10 1l 12 13 to 4. As the piston a completes its movement, the lever u and connecting-rod t are moved, and the valve z' moved to the position shown in Fig. 3, which opens the port 17 for steam passing by 14 15 17 to the cylinder g2, and the pistons i" 0" and main valve o are moved, and the main and secondary valves assume the positions shown in Figs. 4 and 5. In this movement the exhaust from g1 remains open through 10 and a hole, 16, in t' to 12,13, and 4; but the moment the steam through 14 and 15 is cut oft' by the surface of the valve o coming to the end of the valve i, the exhaust of g1 is stopped by the surface of o at 19closing the hole 16, so as to conne any small quai'itity of vapor in g1 to cushion the piston i, and at the same time the exhaust from g2 is opened through 17 15 14 13 to 4. The valve 0 during its movement closes the port 3, and then opens the exhaust from 3 to 4 simultaneously, admitting steam to the cylinder a by the other ports 2 to movethe piston a. Vlien the piston a' completes its movement in this direction, the lever u and rod' t are again moved, and the valve 'L' is moved to the position -shown iu Fig. 1; and during the movement of the valve 0 from the position Fig. 4 to that of Fig. 1 the exhaust from g2 is cut off by the surface of o at 20 closing the hole 21, so as to confine a small quantity of steam in g2 to cushion the piston i", and then the exhaust to g1 is instantly opened, thus providing for exhausting the steam from the respective cylinders g1 g2 by the movement of the main valve; and the distance between the end of the valve -i and the exhaust-port 13 beingy thesame as the width ct' the port 12 or 14, the exhaust from the valve moving cylinder g1 or g2 is opened at the same instant that the steam is cut oit' from that cylinder, thereby taking oil' the actuating-pressiire, and thus preventing concussion on the valve-pistons.

I claim as my invention v l. The ports S 8 in the valve-seat of the cylinder a, in combination with the connections for the pipes w and x upon opposite sides 0f said cylinder, substantially as described.

. 2. The slide-valve o, provided With the ports 12 and 14, and the secondarjr valve fi, with the ports 11, 13, and 15, constructed and arranged as specified, so that the motion of the main valve o closes the port to the valve-moving cylinder g1 or g2, and simultaneously opens jche exhaust from that cylinder7 as and for the Apurposes specified.

Signed by me this 29th day of July, A. D.

vVitnesses GEO. T. PINCKNEY, (1I-ms. H. SMITH.

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