US162513A - Improvement in valves for compound engines - Google Patents

Description

Patented Apri|27,1875.

THE GRAPHIC CO.PHOT0LITH.39&4I PARK PLAGE.N.Y.

W. WRIGHT Valve for Compound Engines.

UNITED STATES IMPROVEMENT IN VALVES FOR COMPOUND ENGlNES.

Specilication forming part of Letters Patent No. 162,5 13, dated April 27, 1875;

application tiled March 24, 1875.

To all whom it may concern Be it known that I, WALTER WEIGHT, ot' Tapleyville, (Danvers Centre,) of the county of Essex and State of Massachusetts, have invented a new and useful Improvement in Steam-Engines; and do hereby declare the same to be fully described in the following specification and represented in the accompanying drawings, of which- Figure l is a longitudinal section, and Fig. 2 a transverse section, of a double-cylinder engine with my invention, which relates to the valve for supplying steam to and discharging it from the main cylinder, and into and from the larger or expansive cylinder, such valve, as represented, being wedge-shaped in transverse section, and to operate with seats out of parallelism.

My invention further relates to a peculiar combination of two cylinders, anda duplex faced valve, to operate as hereinafterdescribed. Also, to a combination of a bearing or support rail and adjusting -screws with the wedgeshaped valve and the two cylinders, arranged in manner and to operate substantially as hereinafter explained.

In the drawings, A denotes the main or lesser cylinder, and B the larger or expansive one, C being the piston of the former, and D that of the latter. The valve shown at F is arranged between the two cylinders, or their valve-seats G H. rlhe faces of both seats are pla-ne surfaces, one being out of parallelism with or inclined to the other transversely, as shown in Fig. 2.

In Fig. 2, b represents the steam-induct pipe leading into a steam-chamber, a, arranged at one side of the cylinder A, in manner as indicated in the figures. rlhis chamber opens through the next adjacent seat of the valve, as seen at c c', and between two ports, d d, leading through such seat from the ends of the cylinder A. The cylinder B is also provided with similar end ports e e', and an intermediate discharge or waste steam passage, f, all being arrangedvwith it and its valve-seat in manner as represented. The valve F has two passages, gg', leadin g transversely through it, as shown. In its face, next to the cylinder A, such valve has two open chambers, h 71.', and, furthermore, it has in the oppositetace three ports. i t" la, connected and arranged as represented. The said valve rests and slides on or against a rail or bar, l, supported on adjusting -screws m m, (see Fig. 3,) which is a longitudinal section taken through the valve.

As the bearing-surfaces ot the valve and its seats may become worn from time to time, the valve may be forced up to them by setting` up the screws. If desirable, the valve may be provided with friction-rollers to rest and run on the rail-Z.

In the operation of this engine the valve is iirst to be moved, so as to bring thechamber h in communication with the ports c' and d', in which case the ports d, g, and e will be in communication. The port c will also be open into the port c', and the port k will also open into the exhaust-passage f. Steam will then be owing into the cylinder A at one end, so as t0 move its piston, and force the steam through the ports d, g, and e into the auxiliary or expansive cylinder B. This steam will move the piston D ot' said cylinder B, and expel the exhaust steam through theA ports e', i', and la. On moving the valve, so as to bring the ports e', g, and'tl into communication, the chamber h will be put in communication with the ports c and cl, and the port e will open into port i. Under this state of things the piston C will be forced in the opposite direction, and the waste steam will be driven into the larger cylinder D, whereby its piston will be moved the opposite way from what it was before, and the exhaust steam ot' said cylinder D will be expelled by the ports e, t', and 7s.

The valve and its seats may have their rubbing-surfaces parallel, and be provided with ports and chambers arranged as represented, and still make, with the other ports, a good engine, provided one cylinder be movable toward the other, or the two be connected by screwbolts and nuts, arranged as shown in Fig. 2. It being, however, far better to have the wedgeshaped valve, owing to the greater facility with. which the wearingsurt'aces of it and its seats may be brought in close contact, I prefer to use such a valve.

I claim- 1. In combination with the two cylinders A B, arrau ged and provided with inlet and outlet passages and ports a, c c', d d', e, f, and c,

as described, a duplex-seated parallel-faced Wedge-shaped valve F and the two cylinders valve, F, arranged between such two eylin- A B, arranged and constructed substantially ders, l(rnd provided with tbe open chambers h as speeitied.

h the transverse passzwes g g and the con- Y neoted ports t' 7c fi', all 1jioeng to operate as WALTER W RIGHT' specified. Witnesses:

2. The combination of the bearing or sup- R. H. EDDY,

port rail Z and its adjusting-screws m with the J. R. SNOW.

Images