US133525A - Improvement in balanced valves - Google Patents

Description

2 haetsnheet J. W. GARBN ER, T. W. RANSN, 8L E. MARR N.

Baia'nced Valves.

- kPatented Dec. 3,1872.

2 Sheets" Sheet 2. J. G AR D N E R, T. W. RAN SON, & E. MARTI N.

Balanced Valv s Patented Dec. 3, i87'2.

@avena-Zaza' f 2in/ended;

of the city ot' Cleveland, in the State of Ohio,

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` JonN W. GARDNER., THOMAS W. 'nANsoN, AND EDWIN MARTIN, OE

cLEvELAND, OHIO. l

IMPROVEMENT iN B'ALANCED VALVES.

To all whom it may concern g Be it known that we, JOHN W. GARDNER, THOMAS W. RANsON, and EDWIN MARTIN, all

have invented a. new Improvement in Valves and ValveMotion, of which the following is a full, clear, and exact description.

The object of this invention is to secure a full and instant throw of the main valve at the commencement of every stroke of the piston while working under or against increasing pressure, thus securing a full supply of steam tothe cylinder Whether the pressure be light or heavy. This invention consists in the combination with each other within a steam-chest oi' two balanced cylindrical valves, the larger or main valve being steam, moved by means ot' one or two pistons attached to the valverod, but which are located Within separate cylinders, upon one or both ends of the steamchest, the main valve being midway distant between these cylinders, and the smaller or auxiliary valve which admits steam alternately to one or more cylinders and pistons, being worked bya trip-rod, the trip-rod being worked in opposite directions by the alternate action of the piston. It also consists in forming, by means of the main valve, two separate independent eXhanst-chambers within the steam- The results therefore attained by this in vention are, that cams, eccentrics, tappets, fly-wheels, starting-bars, or any other device used to overcome the dead-center, are dispensed with, except a trip-rod to move the auxiliary valve.

In the drawing, FigureI represents a longitudinal section of my improved valve in position on the cylinder; Fig. II is a modilication of the valve; Fig. III is a central cross-section of Fig. I; and Fig. IV is a plan view of the auxiliary valve and the ports.

A represents a steam-chest; B, aA main steam-cylinder; C D, two steam-chest cylinders, one upon either end of the chest but each cast separately therefrom, and divided from it by means of two steam-tight partitions, E E, these two cylinders also being arranged upon the saine plane with the steamchest. Within the chest is a steam-moved,

balanced, cylindrical main valve, F, and there is also upon both ends of the valve-rod G, within each of the cylinders C D, a piston, H H, which necessarily operates the main valve, so that it opens the ports ct b which supply steam to the large or main steam-cylinder B. The passages whichsupply steam to the two cylinders containing the pistons which operate the main valve are controlled by a balanced, cylindrica'l, auxiliary valve, I, attached to a triprod, K, which, in the dra-wing, is shown as placed between two cylinders, so that the triprod will be moved in opposite directions by the alternate action of two pistons; but it is obviousthat by an extension of the auxiliary valve two trips may be so arranged as to be operated by every stroke of a single piston. In Fig. Il there is shown a modification of the valve motion, so that the main valve may be Worked by a single piston. A description of this feature is deemed unnecessary, it being so clearly shown in the drawing, the only distinction being that in the modification two steam-passages, 1 2, enter a single cylinder; whereas, in the other form of construction a steam-passage enters each of the cylinders upon either end of the steam-chest. Steam is conducted into the steam-chest through the steam-pipe f, and to the auxiliary valve through the steam-passage u..v In describing the ports and passages of the steam-chest and cylinder, it is necessary to understand the piston of the main steam-cylinder to be at its lower stroke, and that it has moved the triprod and thrown the auxiliary valve, which opens the passage c, and admits steam to the cylinder` D. Simultaneously the steam-passage d is opened, which allows the steam to escape from the cylinder C through an un seen passage into the main exhaust, and thereby the main valve is moved. This opens the port b and admits steam into the lower part of the main cylinder; at this time the portais opened, so that the steam in the upper end of the main steam-cylinderB is permitted to escape through the exhaust-port m in the steam-chest into the main exhaust. An 11p-stroke of the piston will cause the steam-ports and passageswhich upon the down stroke were opened to the steam--to be opened to the exhaust, and those which ywere last time opened to the exhaust to be the next time opened to the steam.-

The arrangement of the valves and pistons l inecach end of they steam-chest. This is bein this invention, as will be seen, is such that they'all move in the same direction at the same time; therefore it is a direct-acting valvemotion, which is also anti-friction, because both the valves are perfectly balanced. The main steam-port is always open to start, no matter where the piston stops in the main steam-cylinder; therefore starting-bars are unnecessary. The main valve is steam-moved and the auxiliary valve is mechanically moved but neither valve is steam-set, thereby rendering the valve-motion certain in its action. This motion can be thoroughly governed in its speed by the throttle, because the main valve always throws instantly a full port, thereby securing the full effect of all the steam which passes through the throttle. The main valve can never be in a position to stop on the center, because one port is always open to the steam wheneverI the other is open to the exhaust. rlhe dead-center is destroyed because all the ports are always open, and none of them are ever closed, except for an imperceptible movement while the valve is changing position. This does not affect the movement ofthe main cylinder pistonin the least, because the valve bein g independent and instantaneously steammoved, is bound to complete its stroke when once started. Whenever the steam is let on uncertain in its action. The main valve itself forms a regular independent exhaust-chamber lieved to be a very important-a salient feature of this invention-because they keep a perfect vacuum at both ends of the valve at the same time, whereby the valve moves without fric tion or compression.

What we claim as new, and desire to secure by Letters Patent, is-

1. The combination of a balanced steam moved main valve, F, operated by one or more pistons, H H, witha balanced auxiliary valve, I, operated by a trip-rod, K, substan tially as herein shown and described.

2. The combination of the ports a b with the steam-passages o d a and the exhaust-ports m, for operating the main and auxiliary valves, substantially as shown and described.

3. The combination of the main valve with the steam-chest, constructed so as to form in the chest two regular and independent eX- A haust-chambers. l In testimony whereof we have hereunto set our hands and seals in the city of Cleveland, in the State of Ohio, this 18th day of November, 1872, each in the presence of two attesting witnesses.

JOHN W. GARDNER. [1.. s]

THOMAS W. RANSON. L. s] EDWIN MARTIN. L. s]

Witnesses:

J. A. BYRNE,

R. E. MIX.

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