US496552A

US496552A - Oscillating valve for engines

Info

Publication number: US496552A
Authority: US
Publication date: 1893-05-02
Anticipated expiration: 1910-05-02

Description

(No Model.)

101133K, i OSGILLATING VALVE FOR ENGINES.

wewonms PETER; co, murmur UNITED STATES PATENT OEErcE.

JOSEPH OHEEK, OF PLATTSMOUTH, NEBRASKA.

OSCILLATING VALVE FOR E-NGINE'S.

SPECIFICATION forming part of Letters Patent No. 496,552, dated May 2, 1893.

Application filed November 29, 1892. Serial No. 453,492. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH OHEEK, a citizen of the United States, residing at Plattsmouth, in the county of Cass and State of Nebraska, have invented a new and useful Oscillating Valve for Steam-Engines, of which the following is a specification.

This invention relates to steam engine valves; and it has for its object to provide an improvement in oscillating valves for steam engines, so that the same shall be constructed with special reference to the reduction of frictional wear and the perfect steam balance thereof, so that the movement of the same will always be uniform and easy.

To this end the invention primarily contemplates certain improvements in the valve easing and the valve mounted to oscillate therein.

With these and many other objects in View which will readily appear as the natu re of the invention is better understood, thesame consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

In the accompanyingdrawings: Figure l is a vertical longitudinal section View of a valve v and valve casing constructed in accordance with this invention. Fig. 2 is a vertical transverse sectional view thereof. Fig. 3 is a perspective View of a valve and casing with the top section thereof removed. Fig. 4 is a detail plan view of one of the end cap plates of the casing havin g the exhaust pocket. Fig. 5 is a detail plan view of the valve sections separated. Fig. 6 is a detail sectional view showing the connection of the valve sections together.

Referring to the accompanying drawings A represents a valve casing or steam chest, cylindrical in cross-section, and comprising the separable members B and B', respectively the upper member of which forms the top cap of the casing, and the other member of which is provided with the steam ports C, communicating with the ordinarysteam ports of an engine cylinder on which the casing is designed to be secured. Both of the valve casing members B and B are provided with the right angularly disposed meeting flanges D, which are suitably bolted together, and which may at any time be planed off so as to reduce the'size of the bore of the cylindrical casing for the refitting of the valve when wear takes place. The casing A, is provided with the opposite side grooves E, which extend 'in from the main bore of the casing, so as to form the upper and lower projecting wear faces F, which are arranged between the ends of said offstanding grooves, to receive the contact portions of the oscillating valve plug G. The valve plug G, is cylindrical in cross-section and is provided with a central longitudinal steam passage or bore H, extending from end to end thereof, and is further provided at each open end thereof with the end packing grooves l, which receive the packing rings J, which rings are forced outward by the steam in the passage H, against the opposite end caps K, of the casing. One of the end caps K, is provided with a steam inlet L, communicating with one end of the valve plug, in order to provide for the admission of steam therethrough, and is further provided at its lower end with the steam exhaust pocket M, at the upper end of which are formed the opposite short exhaust grooves fn, which communicate with the oifstanding grooves E, at each side of the valve casing, in order to carry off the exhaust steam which escapes into the space between the oscillating valve and the interior bore of the valve casing.

The valve plug, or simply the valve G, is of a smaller diameter than the casingin which the same is mounted, and is provided with the lower rounded bearing boss N, which snugly works over the lower bearing face F, of the valve casing and the steam ports C, of

-the casing, with which is adapted to be aligned the live steam port O, formed longitudinally through the lower portion of the hollow cylindrical valve. The valve G, is further provided with the upper flattened side P, from which project near each end thereof the guide lugs p, which hold in position the separable and steam adj usted cap Q. The cap Q, is provided with an under iiattened face q, adapted to register with the flattened side of the valve and near each end thereof with the short end flanges q', which slightly lap theI rounded sides of the valve and serve to hold the separable cap in proper relation thereto.

IOO

The cap Q, is provided near each end thereof with the notches R, taking over the lugs p, which serve to hold the cap in connection with the valve, and said cap Q, is further provided in its under attened face with a circular steam pocket or recess S, which accommodates the packing rin g T, and which communicates with the aligned steam openings U, extending longitudinally of the upper portion of the valve, and in the cap Q, it being observed that the rounded face of the cap oscillates on the upper wear face F, of thc valve casing, and may be provided with suitable face packing V, if so desired.

Nowit will be readily seen that the pressure of the steam in the central steam passage H, of the valve will not only pass through the lower steam port O, into the cylinder of the engine, but will also pass up through the steam openings U, in the valve and separable adjustable cap,and thereby enteringr the circular steam recess S, will tend to separate the cap from the valve and thereby force the two wear faces of the valve in close contact with the wear faces F,of the valve casing,and at the same time the steam will force the packing ring'l, downward onto the body of the valve to prevent any leak or escape of steam. The steam coming in contact with the upper inner wall of the casing through the steam opening of the separable cap will cause an equalization of the steam pressure so as to materially re duce the frictioual wear of the valve, and in order to lnore etfectually attain this equalization of the steam pressure, the top face of the cap Q, directly over the recess S, is further provided with a circular' auxiliary steam pocket s, which contains about one-quarter less space than S. The auxiliary pocket s,is designed to reduce the pressure against the inside of the valve casing by allowing nearly the same pressure of live steam against this portion of the top of the valve cap, and by rea-son of this back pressure on the valve cap the friction between the latter and the casing is greatly reduced, and there is only suflicient friction left to serve to keep the valve tightly seated at its points of contact. It is of course understood that the opening U in the cap Q, leads from the recess S to s.

The casing A, is provided at one side with the slot WV, in which vibrates the valve stem X, the inner end of which is threaded into one side of the valve G, and which carries a curved sliding closing strip Y, which works within one of the opposite side grooves E, of the casin g and serves to cover the slot through the entire movement of the valve stem, and said st rip Y, is held in close contact with the inner side wall of the casing over said slots by means of the spring Z. It is apparent that the steam entering at L, passes through the cent-ral bore H, of the valve and alternately through one of the steam ports C, of the casing, while the steam is exhausted alternately through the other steaxn port, and passing through the large space surrounding the valve in the casing finds its escape through the exhaust pocket M, at one end of the valve casino.

Changes in the form, proportion and the minor details of construction may be resorted to Without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In an oscillating balance steam valve, the combination of a sectional cylindrical valve casing, having upper and lower 1nwardly projecting Wear faces, lower parallel steam ports, and an exhaust pocket at one end of the same, and a hollow oscillating valve provided with projecting bearing faces contacting with the wear faces of the casing and having a single live steam port extending longitudinally thereof, substantially as set forth.

2. In an oscillating steam valve, the combination of a sectional cylindrical valve casing having opposite ott-standing inner side grooves forming enlarged exhaust spaces and having bottom steam ports, an oscillating valve mounted within said' casing and contacting with the latter between the ends'of said side grooves said valve being provided with a central longitudinal steam passage or bore, end packing grooves at opposite open ends thereof, and single live steam port, and steam adjusted packing rings arranged within said end packing grooves and adapted to be held against the end caps of the casing, substan tially as set forth.

3. In an oscillating valve for steam engines the combination ot' an iuclosed casing having an inner cylindrical bore and bottom steam ports, one of the end caps of said casing being provided with a steam exhaust pocket and short exhaust grooves at the upper end of said pocket, and a hollow cylindrical valve mounted within said casing and provided with a single steam port communicating alternately with said steam ports, substantially as set forth.

4. The combination of a sectional cylindrical valve casing having opposite off-standing inner side grooves forming enlarged exhaust spaces, and having longitudinally disposed bottom steam ports, one of the end caps of the casing having a steam inlet and a steam exhaust pocket at its lower inner end and cx tended at its upper end into opposite short exhaust grooves communicating at one end of the casing with the off-standing grooves at the inner sides thereof, and an oscillating hollow steam valve of smaller diameter than the bore of the casing and provided with projecting bearing faces working between the ends of said side grooves, and a single bottom live steam port adapted to alternately register with the steam ports of the casing, sub stantially as set forth.

5. The combination of a cylindrical steam IOO IIO

chest or valve casing, having opposite projecting wearA faces and steam ports leading from one of said faces, and a hollow oscillating steam valve mounted to oscillate in said casing and provided with a rounded bearing boss at one side moving over one of the Wear faces of the casing, and a separable steam adjusted cap at its opposite side moving over the other wear face of the casing, substantially as set forth.

6. In an oscillating balanced valve, the combination with the cylindrical casing; of an oscillating cylindrical valve plug mounted within said'casing and having a steam opening in one side, and a steam adjusted separable cap fitting over said steam opening and provided with top and bottom steam pockets or recesses and a connecting steam opening there-between and in line with that of the valve plug, substantially as set forth.

7. The combination with the cylindrical valve casing, of a hollow cylindrical valve plug contacting with two sides of the faces and of smaller diameter than'the same, said valve'plug being provided with a iiattened side and a steam opening through said side, and a separable steam adjusted cap arranged over said iiattened side of the steam openi-ng therein, substantially as set forth.

8. In an oscillating balanced valve, the cornbination of acylindrical'valve casin ghavin g an end steam inlet and exhaust ports and parallel bottom steam ports, a hollow cylindricalvalve plug arranged within the casing and provided with a single longitudinal steam port in one side, an opposite Iiattened side and a steam opening in such side, a separable steam adjusted cap arranged over said flattened side and provided with a circular steam pocket or recess covering the steam opening in the valve and an aligned steam opening leading from said steam pocket or recess, and a packing ring arranged within said pocket or recess, substantially as set forth.

9. In an oscillating balanced valve, a cylindrical casing having bottom steam ports, a hollowr cylindrical valve arranged within the casing and contacting with opposite inner sides of the same, said valve having a bottom steam port, an opposite fiattened side, asteam opening in such side, and projecting guide lugs near the ends of said fiat-tened side, a separable steam adjusted cap having notches taking over said lugs, an outer rounded face adapted to contact lWith one of the inner sides of the casing, short end flanges lapping the valve, acircular steam pocket or recess covering the steam opening in the valve, a smaller steam pocket in the top of the cap, an aligned steam opening leading from said pocket or recess through the cap into said smaller steam pocket in the top, and a packing ring arranged within said pocket or recess, substantially as set forth.

10. The combination of a cylindrical valve casing having opposite inner side grooves and a side slot leading into one of said side grooves, the oscillating valve plug arranged Within the casing, the vibrating valve stem Working in said slot and connected at its inner end to one side of the valve plug, and a curved closing strip mounted on said valvestem and working in one 4of said inner side grooves over said slot, substantially as set forth.

11. The combination of a cylindrical valve casing having opposite inner sidegrooves anda side slot leading into one of the grooves, the oscillating valve, the vibrating Valve stem Working in said slot and secured at its inner end to one side of the valve, a curved sliding closing strip mounted onsaid valve stem and Working in one of said inner side grooves over said slot, and a spring arranged 0n the valve stem between the Valve and said strip, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

JOSEPH CHEEK.