US502132A - George s - Google Patents

Description

(No Model.)

G.S. NEELEY. BALANCED SLIDE VALVE.

No. 502,132. Patented July 25, 1893.

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GEORGE S. NEELEY, OF PACIFIC, MISSOURI, ASSIGNOR TO HIMSELF AND FERDINAND MEURER, OF SAME PLACE.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 502,132, dated July 25, 1893.

Application filed March 18, 1893. Serial Nun-466.644. (N0 model.)

To all whom it may concern.-

Be it known that I, GEORGE S. NEELEY, of Pacific, in the county of Franklin and State of Missouri, have invented a new and Improved Balanced Slide-Valve, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved balanced slide valve,which is simple and durable in construction, arranged to utilize the motive agent to the greatest advantage, and constructed to reduce the friction to a minimum.

The invention consists of certain parts and details, and combinations of the same, as will be hereinafter described and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure l is a sectional side elevation of the improvement as applied; and Fig. 2 is a sectional plan view of the same on the line 2-2 of Fig. 1.

In the cylinder A reciprocates the piston B in the usual manner, and the said cylinder is provided with the steam inlet ports a and 12 adapted to register alternately with the ports 0 and (2, formed in theslide valve D mounted to slide in the steam chest E, and provided with a valve stem F connected with the usual mechanism for imparting a reciprocating motion to the said valve to alternately connect the ports 0 and d, with the ports a and b respectively. The ports 0 and d diverge from a common port e registering at all times with a port f formed in a plate G held loosely on top of the valve D within the chest E. On the top of this plate G rests a hollow piston H fitted steam-tight in a cylinf der I formed in the cover J for the steam chest E. The upper end of the cylinder I is closed by a cover L connected with the steam supply, and on the under side of the said cover rests the upper end of a spring K coiled in the cylinder I and pressing with its lower end on the hollow piston 11, so as to hold the bottom surface thereof in contact with the plate G, the area of the piston being about one-fifth more than that of the port f.

In one side of the steam chest E is arranged an exhaust port g leading to the outside, it being understood that the steam passing into the lower part of the steam chest Efrom thecylinder A can pass through the port g to the outside. The valve D is somewhat less in width than the width of the steam chest, as plainly indicated in Fig. 2, so that the steam passing from the cylinder to'either port a or 1) into the chest can pass between the valve and the rear side of the chest to the port g to escape to the outside. Now, it will be seenthat steam entering the cylinder I can pass through the hollow piston H andport f into the common port 6, from which the steam passes into the ports 0 and d, of which one is connected at a time with the respective cylinder ports a and I), while the other port is closed, as will be readily understood by reference to Fig. 1. Now, when the several parts are in the position shown in Fig. 1, then the live steam entering the port 6 passes through the port 0 and cylinder port a into theleft hand end of the cylinder A to push the piston B in the direction of the arrow at. Steam in front of the piston B now exhausts through the port b, the lower part of the chest E and exhaust port g. When the piston B nears the end of its stroke, the valve D is shifted in the direction of the arrow a, so that the ports 0 and a are disconnected, and the ports b and d are connected with each other, whereby the live steam passes into the right hand end of the cylinder to force the piston B in the inverse direction of the arrow a. The exhaust then takes place through the port a, the lower part of the chestE and the exhaust port g. It is understood that on the shifting of the slide valve D, the port 6 remains in register with the port It is further understood that by this arrangement the steam is passed in as short a route as possible from the cylinder I to the ends of the cylinder A, and by the plate G being interposed-between the piston H and slide valve D, the latter is sufficiently counterbalanced to insure easy running and at the same time reduce friction to a minimum.

- Having thus fully described my invention, I claim as new and desire to secure by Letters Patent-- 1. The combination with the steam chest having alateral exhaust g,and cylinder ports a b, of the balanced slide valve having diverging ports, and made of less Width than the steam chest, to allow exhaust steam to pass around it, substantially as shown and described.

2. Ahalance slide valve comprising a steam chest connected with the cylinder ports and provided in its side with an exhaust port, a slide valve mounted to slide in the said chest and provided with diverging ports adapted to alternately connect with the cylinder ports, a plate held in the said steam chest on top of GEORGE S. NEELEY.

Witnesses:

CHARLES SToLL, D. H. BUOKINGHAM.

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