US87538A - Improvement in steam-engine rotary valves - Google Patents

Description

didnt? taire,

weessaeew gaat@ A. R. UFFINGTON, OF UNITED STATES ARMY.

Letters Patent No. 87,538, lated Mei/rch 9, 1869.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'itma-y concerm' Be it known that I, A. R. BmrFrNeTomcaptain of ordnance, and brevet maior, United States army, have invented a new and useful Improved `Valve, for use in and with steam and other engines, viz, a revolving valve, that can` be adjusted to out oli and 1ead,

'at will, the exhaust fully opening before, and closing slower than the portg and I vdoiherehy declare that the following is a fullclear, and exact description of th-construction and operation of the same, referencebeing' had to the annexed drawings, forming part of this specification, lin which- Figure 1 is' a plane view of valve, and

v Figures 2, 3, 4, and 5, plane views of parts of valve and valve-seat.

The valve consists essentially of a plate, e, iig. 1, fastened to an arbor `or shaft-c, fig. 1, so as t'o revolve with it, and having two concentric annular slots d e, as shown in fig. 1.

Between these slots, on eachside of the valve-plate, an annular spring-packing, l, iig.1, is p'laced, in a groove of rectangular cross-section.

`Inside of this groove, on each face, a plate is embedded. These plates are shown in F, fig. 3, and G, iig. 4. One of' these, F, tlg. 3, has a sleeve, 7i, shown in section h, fig. y5, through which the shaft or arbor turning the valve passes. l

These two plates, F and Gr, iigs. 3 and 4, constitute the cuttingeoii, arrangement, or device, and on the valve are connected, by a pin or bolt, i, figs. 3 and 4, whose position, when theport is open throughout the whole-stroke, is shown at b, iig. 1.

nt, iig. 2, represents the valve-seat. The four holes, :n x, y y, are, the inside ones, :c 11:, the ports, and the outside ones, y y, the exhaust; one of each connected, as below indicated, with the top and bottom, or ends, of the steam or other cylinder.

Passing between the ports andV exhausts, as shown in the fig. 2, is an annular groove, Ic, oi' rectangular cross-section, corresponding, in distance from the com tre, to the annular packing on thefaee oi the valveplate in contaetwith the seat.

The cover: of the valve corresponds exactly with the valve-seat, the grooves and holes, ports and exhausts, being alike, and opposite.

The annular slots l c, fig. l, of the valveplatc, are

concentric with tliecentre, and so arranged that one exhaust-hole, and the port farthest from it, are always open during the revolution of the valve, `except at one point, viz, when the change to the other exhaust andf port-holes is about to take place. At this time, all are closed. 4

The valve-plate being adjusted to the shaft or arbor, so as tn permit it to be turned around the shaft or arbor, and fastened again Iat any point, the time of this changing, just named, from one port and exhausthole to the other set, may be made to correspond to 'any position of the piston-head in the cylinder, and consequently the lead vcan be adjusted at will.

The sleeve It of the cut-olf plate, figs. 3 and 5, projecting on the shaft or arbor, through the valvecover, permits the cut-off device to be turned around it in one direction, and fastened again at any point,

Without removing the valve-cover; and thus for sta tionary, not reversible engines, the eut-off may be adjusted at will.

From the nature of the motion--angular-of the valve, and relative position of the port and .exhaustholes, their centres being in the'same straight line, 1t follows, that the ports being nearer the centre of inotion, will open slower than, and begin to close before lthe exhausts.

To pack the valve, besides having the parte all ground together, the steam or other motor enters between the plates of the cut-od' device and the valve- Vplate, the former being made suiiiciently thin to per- 4mitsotne play between the valve-plate, and seat and cover; and in the annular grooves, in valve, and4 seat, and cover, as above described, annular springpackings are placed, which, also acted on by 'the motor entering the grooves, through connections, (grooves on valve-plate faces,) made at any point, as at Z, iig. 1, with the slot e, iig. 1, press outward, and pack hetween the ports and exhausts.

The relative position of the valve herein described, to the cylinder, is not fixed; for instance, the valve may be placed on the crank-shaft, dispensing with the devices used to move the slide and rotating valve. Therefore,

What I claim as my invention, and desire to secure by Letters Patent, 'is- The improved revolving valve, for steam and other engines, consisting of devices herein described, ern bracing the valve-plate e, with the two concentric circular slots el and e, and the groove 7c, for the reception ofthe annular packing l, the cut-off` devices E and G, sleeve h, seat m, with its groove k, and ports y y and a: x, arranged to operate substantially as herein set forth.

A. R. BUFFINGTN.

Witnesses: y

. Fianna H. Priirrs,

JOHN Arrnm.

Images