US786913A - Valve mechanism for engines. - Google Patents

Description

No. 786,913,y PATBNTED APR. 11, 1905. 11H. MOORE.

`VALVE MCHANISM FOR ENG-INES. APPLIOATION 11111111 JULY 31, 1903` 6 SHEETS-SHEET 2.

WITNESSES:

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Ano/m5 YS.

N0.786,91 i PATENTED APR.11,:L905.

- J.H.MOORB.

VALVE MEGHANISM POR ENGINES. APILJICATION FILED JULY 31, 1903.

6 SHEETS-SHEET 3.

NmsemsQ PATENTED Amun, 1905.

Y' n J. E. MOORE. j y

VALVE MEGHANISM EOE ENGINES.

Y I' APPLICATION FILED JULY 3l, 1903.'

' GSHEETs-SHEET 4.

2 O g l "Ilm vif/rol? A BY y K @Arron/EVS No. 786,913. f PATENTED APR.y v11, 1905,

f y i i J. H. MUORE. n VALVE MEGHANISM PoR ENGINES.

` APPLIOATIUN FILED JULY 311,11903.

6 SHEETS-SHEET 5.

Maw. wf@ Y f l MUM-HS No. 786,913.. y PATBNTLD APL.11,1905.

' J. H. MOORE. VALVE MBGHANISM PUR ENGINES.

k APYPLIOATIQN FILED JULY 31. 1903.

6 SHEETS-SHEET 6.

I MATTUHNEYS v UNITED STATES Patented April 11, 1905.

PATENT OFFICE.

JOHN HERMAN MOORE, OF CLEVELAND, OHIO, ASSIGNOR TO ANNA Z. .BAXTER AND A. A WILLIAM BAXTER, OF CLEVELAND, OHIO.

VALVE NIECHANISNI FOR ENGINES;

SPECIFICATION forming of Letters-)Patent N0. 786,913, dated April 11, 1905. n Application filed July 3.1, 1903. Serial No. 167,756'

To all whom t may 'concern/.-

Be it known thatI, JOHN HERMAN MOORE, a citizen of the United States of America, re"- siding at Cleveland, in the county ofOuyahoga and State of Ohio, have invented certain new and usefulV Improvements in Valve Mechanism for Engines; and I hereby declare the foly lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates to improvements in valve mechanism for engines operated by fluid under pressure, and pertains more especially to valve mechanism especially well adapted for steam-engines and comprising two rotary steam-admission valves and twov rotary exhaust-valves.

One object of thisinvention is to reduce the clearance or length of travel of the steam or fluid under pressure between the valve-'casing and the chamber of the cylinder.

Another object is to perfectly balance the iiuid-pressure-admission valves of the valvecasing and to reduce the wear upon the said valves to a minimum. y

lAnother object is to automatically take up any wear between each valve of the valvecasing and the adjacent face of the adjacent valve-seat-forming partition in the valve-casing. v

Another object is to utilize the inclosing casing or shell of the 'governing mechanism asa portion of the reversing mechanism of the engine.

Another object is to prevent the destruction of or injury to the'cylinder and valve'mechanism by hydraulic or spasmodic pressure created within the cylinder from any cause.

Another object is to have the exhaust-valves independent of vthe fluid-pressure admission valves and to provide means whereby the point of cut-off-that is, the time at which the supply` of fluid under pressure to either end of the cylinder relative to the position of the piston-may be regulated or changed at pleasure, whereby the point of cut-ofi' in supplying Huid under pressure to one end of the cylinder may be regulated or changed independ-I l ently of the point of cut-offinsupplying fluid under-.pressure to the other end of the cylinder, whereby the point of release-that is, the

gins to exhaust relative to the position of the piston-may be regulated at pleasure, and whereby the point of release in exhausting from onecnd of the cylinder may be regulated hausting from the other end of the cylinder, and whereby the point of release, and consequently the amount of compression, may be regulated or changed independently of the point 'of cut-off.

With the above-mentioned objects in view and to the end of realizing other advantages hereinafter appearing this invention consists in certain features of construction and combinations of parts hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a top plan, largely in section, illustrating the engine-cylinder, the piston and piston-rod, valve mechanism, and a portion of the means employed in transmitting power from the engine-shaft to the valve mechanism. Fig. 2 is a top plan, largely in section, showing the mitting motion to the said shaft, and a portion of the means employed in transmitting power from the engine-shaft to the valve mechanism. Fig. 3 is a side elevation, in vertical section. on line 3 3, Fig. l, looking in the direction of the cylinder. Figs. 4, 5, 6, 7, 8, and 9 are transverse vertical sect-ions on line 4f 4, line 5 5, line 6 6, line 7 7, line 8 8, and line 9 9, respectively, Fig. 8, looking in the direction indicated by the arrow. Fig. 10 is a side elevation, partly in section, of a portion of the valve-bearing shaft, governing mechanism, and means instrumental in reversing the engine. Figs. 11 and 12 are transverse vertical sections on line 11 l1 and line 12 12, respectively, Fig. 10, looking in the di- *rection indicated by the arrow.

Referring to the said drawings, and more especially to Figs. l and 2, a designates the cylinder 0f the engine, b the piston arranged within and adapted to reciprocate cndwise of engine-shaft, the pitman employed in traps-- time at which either end of the cylinder beindependently of the point of release in exthe chamber of the cylinder, and c the pistonrod, which extends through a stuiiing-box (Z, formed upon the lower or inner end of the cylinder. neeted with a cross-head A, arranged in line with the piston-rod and engaging with a slideway B, which cross-head is operatively connected by a pitman or link e with the wrist of the crank f, with which the suitably-supported engine-shaft g is provided. The shaft g and the cylinder a are arranged horizontally and at a right angle to each other.

A valve-casing Z is arranged at one side of the cylinder a. The valve-casing Z is formed upon or supported from the cylinder t in any approved manner.

A valve-bearing shaft D is arranged horizontally and parallel with the cylinder a. The shaft D extends longitudinally and centrally through the valve-casing Z. The valve-casing Z at its inner end and adjacent to the inner or stuflng-box-bearing end of the cylinder a is provided with a stuffing-box my around the shaft D. The valve-casing Z is also provided at its opposite end with a stuffing box M around the shaft D.

Between the shaft D and the engine-shaft f/ is a shaft Z5, which is arranged at a right angle to the engine-shaft and in line endwise with the shaft D. rl `he shaft Ze extends from a point in suitable proximity to the shaft D to a point near the engine-shaft g, which is intergeared, as at w, with a suitably-supported short shaft y, arranged parallel with the shaft g between the said shaft g and the adjacent end of the shaft The shaft 1/ is operatively provided with a bevel-gear c', which meshes with a bevel-gear j, operatively mounted 0n the shaft Zt. Power is transmitted from the shaft Zr; to the shaft D, as will hereinafter appear. Y

rlhe valve-casing Z is provided interiorly with a cylindrical bore C, in which are arranged two fluid-pressure-admission valves Gr, two exhaust-valves K, and two valve-seatforming partitions- H.

1The two valves G, which control the admission of steam or iuid under pressure to the cylinder a, are arranged a suitable distance apart and equidistant from opposite heads L, respectively, of the valve-easing Z. The valves G are shown very clearly in Figs. 1, 3, 4, and 9. The two valves G are shown formed upon opposite ends, respectively, of a collar Zt, and each valve Gr comprises, preferably, a disk which is integral with the collar t. rlhe collar ZL, and consequently the valves G, are operatively connected with the shaft D. The operative connection between the collar Zt and the shaft D comprises the well-known means of groove and feather, as at F, and suitablyapplied set-screws E, which are instrumental also in fixing the said collar to the said shaft. The annular space J, which surrounds the collar /L and extends between the valves Gr,

r1`he piston-rod c is operatively con- 'constitutes the live-steam chamber or main fluid-pressure-receiving chamber of the valvecasing, which chamber communicates at the top with the Huid-pressure inlet l, with which the top of the valve-casing is provided centrally between the ends of the said casing, as shown in Figs. 3 and 4.

Each valve Gr is circular and has the dimensions required to render it capable of fitting snugly but rotatably within the bore (l of the valve-casing. Each valve G is provided in its outer end face with a circular recess fn, which surrounds the shaft D and is instrumental in forming the outer end of the Hind-pressureconducting port N, with which said valve is provided, which port extends endwise through the valve. The two valves Gr correspomil in construction; but they are reversely arranged, and the ports N of the different valves (l are arranged at diametrically opposite sides, respectively, and concentrically of the shaft D. rlhe port N of each valve G extends concentrically of the shaft D about one-sixth of the distance circumferentially of the collar Z1., as illustrated in Fig. 4, which shows one of the said valves.

The two exhaust-valves K are arranged within opposite ends,l respectively, of the bore C of the valve-casing. Each valve K is arranged far enough vfrom the outer end face of the adjacent pressure-admission valve te accommodate the interposition between the said valves of a valve-seat-forming partition, which comprises an annular block H.

Each valve K comprises a circular disk which is large enough in dimensions to render it capable of snugly but turnably [ittingwithin the bore() and formed upon and preferably integral with the inner end of a sleeve n, which is operatively but slidably mounted on the shaft D. The operative connection between eaeh sleeve 0 and the shaft D is preferably foimed by the well-known means ol groove and feather, as at 71, as shown in Figs. 1 and 5. Each valve K is provided with an exhaust-port P, which (see Fig. 1) extends endwise through the said valve and communi- Cates with the annular space Q, formed around the sleeve o, upon which the said valve is formed, which space constitutes an exhaustchamber, which is lconnected by a passage-way fr, formed at the bottom of the valve-casing, with the exhaust-outlet R, with which the said easing is provided at the bottom and centrally between the ends of the valve-casing, as shown in Figs. 3 and 4.

rlhe ports P of thc different exhaust-valves K are arranged at diametrically opposite sides, respectively, of the shaft D, as shown in Fig. 1. The port P of each exhaust-valve K and the port N in the adjacent pressure-admission valve G are arranged at diametrically opposite sides, respectiif'ely, of the shaft l). 'lhe port P of each exhaust-valve K extends concentrieally of the shaft lf) preferably about IOO TTO

y one-fourth of the distance circumferentially of the sleeve o, upon which the said valve is formed, as shown in Fig. 5. 4

The block H of each valve-seat-,forming partition interposed between the outer end face of the adjacent exhaust-valve K is large enough in dimensions to render it capable of snugly fitting within the bore C of the valve-casing without, however, interfering with its limited capability of shifting endwise of the said casing. l The said block H comprises a centrallylocated core 15, which is annular, surrounding the shaft D and having its bore, through which the said shaft extends, somewhat larger diametrically or transversely than the said shaftto form a passage-way s around and next to the said shaft, as shown in Figs. 3, 6, 7, and 8, which passage-way extends through and from end to end of the said block. The said block is provided (see Figs. 3, 6, and 8) with peripheral packing-rings u, which extend cir- `cumferentially of the block and "maintain a iuid -tight joint between theblock and the surrounding wall of the bore C of the valvecasing. The said block H is provided in each end face thereof, as shown in Figs. 8, 6, and 8, with an annular recess t, which surrounds the core 15 of the Vblock and is arranged concentrically with and extends circumferentially of the shaft D. The different recesses fof each block H are instrumental in the formation of opposite ends. respectively, of a port T, with which the said blockis provided, which port extends endwise through the block and concentrically of the shaft D. The fluid-pressure-receiving end 16 of each port T extends circumferentially of the shaft D equidistantly or approximately equidistantly withthe port N of the adjacent pressure-admission valve G, and consequently extends about one-sixth of the distance around thesaid shaft, whereas the iiuid-pressure-discharging end 17 of the saidport extends circumferentially of'the said shaft-equidistantly or approximately equidistantly with the port P of the adjacent exhaustshown very clearly in Fig. 7. The said block is provided diametrically opposite each port T with a lateral aperture 20, which is formed j in the outer end of the block and communicates with, and consequently affords access to, the chamber 18 of the block, as shown in Figs. 1 and 6. Meansfor preventing displacement of the said block H circumferentially is provided and comprises, preferably, a screwthreaded pin 21, which, as shown in Figs. 1

Said pin 21 does not, however, fix the said block to the valve-casing; but the aforesaid hole 22 is elongated somewhat endwise of the block or longitudinally of the valve-casing, as shown in Fig. 1, to accommodate a limited shiftability of the block inwardly endwise of the said casing.

The port T of the block H of one of the valve-seat-forming partitions communicates with the cylinder-port 14, which communicates with the chamber of the cylinder a at one end of the cylinder, and the portTof the block H of the other valve-seat-forrning partition communicates with the cylinder-port 14C, which is in communication with the said chamber at the opposite end of the cylinder.

Each exhaust-valve-bearing sleeve ois provided at its outer end, as shown very clearly in Fig. 8, with an external annular flange 25, which is provided at its periphery and outer face with an annular rim 26, which snugly but turnably embraces a metal ring w, which surrounds and is arranged concentrically relative to the shaft D and abuts tightly at its outer end against the inner side of the adja-l cent head L of the valve-casing Z. Said flange 25 isv provided iny its outer face and adjacent to the inner end of the said ring w with any suitable number of recesses 27, arranged at suitable intervals circumferentially of the said sleeve 0 and containing spiral springs 28,l which extend from within the said recesses into engagement with and bear against the inner end of the said ring and hold said ring sufiiciently snugly against the inner side of the adjacent head L of the valve-casing to render the joint between the said head and the said ring practically iiuid -'tight. Said springs 28 also act to retain' the adjacent exhaust-valve K against its seat on the adjacent valve-seat-forming partition.

It will be observed that an annular space or chamber 30 is vformed around the shaft D at the outer end of each sleeve 0 and within the ring w adjacent to the said sleeve, and enough steam or iuid under pressure is conducted into the said chamber, as will hereinafter appear, to maintain just enough pressure upon the outer end of the said sleeve to cause the said sleeve and the valve K formed thereon to exert enough pressure against the outer end face of the adjacent valve-seat-forming partition to hold the said partition constantly against the outer end face of the adjacent pressureadmission valve G and take up any wear which may occur after long usage between the said partition and the said valves.-

The springs 28 normally havea range of compressibility, and the rim 26 of the fiange 25 of each sleeve 0 does not embrace the enroo TIO'

gaging ring w from end to end and does not, therefore, extend into engagement with the adjacent head L of the valve-casing, so that the said sleeve, and consequently the exhaust-valve K formed on the said sleeve, are capable of shifting to a limited extent outwardly endwise of the shaft D. Each exhaust-Val ve is, therefore, yieldabl y held against the outer end face or valve-seat of the adjacent valve-seat-forming partition, and any hydraulic or spasmodic pressure created Within the cylinder a when the exhaust-Valve K adjacent to the said end of the cylinder is closed instead of resulting in injury to any member of the engine acts, through the cylinder-port 14 of the said end of the cylinder and through the port T, formed in the adjacent Valve-seatforming partition and communicating With the said cylinder-port, against the inner face of the adjacent exhaust-valve and compels the said Valve to yield against the action of the springs 28, which act to retain the said valve against its seat on the said partition, and hence escapes between the said partition and the said valve into the adjacent exhaust-chamber Q, without having damaged any member or portion of the engine.

The arrangement of the parts hereinbefore Adescribed and including the pressure-admission valves, the valve-seat-forming partitions, and the exhaust-valves K is such that, as shown in Fig. 1, -the port N of the pressureadmission valve Gr at one end of each partition and the portP of the exhaust-Valve K at the opposite end of the said partition communicate alternately With the port T of the said partition during the operation of the shaft D, and the different pressure-admission valves open alternately. Obviously, therefore, when live steam or iiuid under pressure passes from Within the chamber J through the port in either valve Gr and through the port T in the partition adjacent to the said Valve into one of the cylinder-ports 14 the exhaust-valve K adjacent to the said partition will be closed and the other cylinder-port 14 will be exhausting through the port T in the other partition and through the port P in the other exhaust- Valve.

- To render it possible to lengthen or shorten the period of Huid-pressure admission to the cylinder-that is, the period of time during which Huid under pressure is admitted to either end of the cylinder during the operation of the engine-to render it possible to change the time at which the said period of Huid-pressure admission begins, and consequently to control the lead-opening, to render it possible to control the termination of the period of fluid-pressure admission-that is, to control the point of cut-oif-to render it possible to control the commencement and the termination of the period of Huid-pressure admission independently of each other, to render it possible to change the beginning, du-

ration, and termination of the period of iinidpressure admission to either cylinder-port independently of the commencement, duration, and termination of the period of {luid-pressure admission to the other cylinder-port, and to render it possible to change the beginning, duration, and termination of the period of fluid-pressure admission to either cylinderport independently of the termination, duration, and commencement of the period of release or exhaust through the other cylinderport, the following is provided:

The recess z5 in the inner end of each block H, as shown in Figs. 3, 7, and S, contains two plates 35, which are adjustable endwise circumferentially and arranged concentricall y of the shaft D. The said plates 35 lill the said recess widthwise and are arranged with their outer faces Hush with the inner extremity of the said block H. Hence the said plates 35 participate in the formation on the inner end of the partition comi'nising the said block of a seat for the pressure-ad mission valve (i next adjacent to the inner end of the said partition. The said plates 35 are arranged at opposite sides, respectively, of the port T of the said partition circumferentially of the shaft l). Each of the said plates 35 is provided centrally between its ends with a bolt-hole 30, which is engaged by a bolt 37, arranged with its head countersunk in the outer side of the said plate, as shown in Fig. 3, which bolt extends through a slot 38, formed in the inwardly-'facing central wall of the recess engaged by the said plate, into the chamber lh of the said block. The said slot 38 isarranged concentrically of the shaft .1), and a nut 3.) is mounted on the shank of the said bolt within the said chamber 18. Obviously the plates 35 are rendered free to be adjusted endwise circumferentially of the shaft l.) upon loosening the said nuts 39 and are secured in the desired adjustment by tightening the said nuts. It will be observed that by means of the adjustable plates 35 of each valve-seatforming partition the commencement, duration, and termination of the period of fluidpressure admission in admitting Huid under pressure to the cylinder through ,the port 'l in the said partition may be changed at pleasure and independently of the means hereinafter described and employed to control the termination, duration, and beginning of the period of exhaust or release in exhausting through the said port and indepeinlently of the control of the period of exhaust or release and of the period of fluid-pressure admission through the port T in the other valveseat-forming block.

To render it possible to lengthen or shorten the period of exhaust or releasethat is, the period of time during which either end of the cylinder exhausts during the operation of the engine--to render it possible to change the point of releasethat is, the time at which the said period beginsto render it possible to control the termination of the said period, to render it possible to control the commencement and the termination of the said period independently of each other, to render it possible to control the beginning, duration, and termination of the period of exhaust or release through either cylinder-port independently of the commencement, duration, and termination of the period of exhaust orrelease in exhausting `through the other cylinder-port, and to render it possible to control the beginning, duration, and termination of the period of exhaust or release independently of the termination, duration, and commencementvof the period of Huid-pressure admission circumferentially-adjustable plates 45 are contained with the recesses t, formed in the outer ends of the blocks H.

As shown in Figs. 3 and 6, each block H is` provided within the recess t, formed in the outer end of the said block, with two plates 45, extending circumferentially and arranged concentrically of the shaft D. The said plates 45 fill the said recesswidthwise and are arranged with their outer faces flush with the outer extremity of the said block H. The said plates 45 participate in the formation of the valve-seat for the exhaust-valve K, arrangedcontiguous to the outer end of the valve-seat-forming partition comprising the said block H. The said plates 45 are arranged at opposite sides, respectively, of the port T in the saidpartitvion circumferentially of the shaft vD and are adjustable endwise. Each of the said plates 45 is provided centrally between its ends with a bolt-hole 46, which is engaged by a bolt 47, arranged with its head countersunlr in thel outer side of the respective plate, as shown in Fig. 3, which bolt extends through a slot 48, formed in the outwardly-facing wall of the recess engaged by the said plate, into the chamber 18 of the said block. The said slot 48 is arranged concentrically of the shaft D, and a nut 49 is mounted on the shank of the said bolt47 within the chamber 18 of the said block H. Obviously the plates 45 arc rendered free to be adjusted endwise circumferentially of the shaft D upon loosening the nuts 49 and are secured in the desired adjustment by tightening the said nuts.

' It will be observed that by means of the adjustable plates 45 the beginning, duration, and termination of the period of exhaust or release in exhausting from the cylinder through the port T in either Valve-seat-forming block may be changed at pleasure and independently of the means employed to control the termination, duration, and commencement of the period of Huid-pressure admission through the said port independently of the control of the period of fluid-pressure admission and the period of exhaust or release through the port T in the other valve-.seat-forming block.

. The governor or mechanism for controlling.

or governing the speed of the engine-shaft is shown to be as follows: Arranged within and centrally of the valve-bearing shaft D is a diametrically smaller shaft 50, which extends through'the shaft D, and stuffing-boxes 40 (see Figs. 1, and 10) are provided around the inner shaft 50 at the ends of the out-er shaft D. The shaft D is therefore tubular, and the shaft 50 has bearing within the shaft D.

Within the recess n of each pressure-admission valve G is contained a cut-ofi1 valve 52, as shown in Figs. l, 3, and 9. Each valve 52 (see Fig. 3) has a hub 53, which embraces and has bearing upon the shaft D. Said hub 53, as shown in Fig. 9,- is provided in the surrounding wall of its central bore with two diametrically oppositely arranged recesses 54,

and a key 55 extends into the said recesses and transversely of and through the shaft 50, which is provided with a transverse slot56 to accommodate the location of the said key. Obviously, therefore, the key 55 extends through the shaft D, which is provided with two diametrically oppositely arranged slots 57, extending circumferentially of and arranged concentrically with the shaft 50. Each vcut-off valve has a head 58 projecting radially and outwardly from the hub of the valve into the closest possible proximity. to the surrounding wall of the recess n, wherein the said valve is arranged without interfering with the capability of the said cut-off valve to shift circumferentially of the shaft D independently of Vits rotation with the pressure -admission valve Gr containing the said cut-01T valve. The

'arrangement of the parts is such that the saidl `cut-off valve is arranged with its head 58at thatside of the port N of thesaid pressure-admission valve which lfaces in the direction in which the said pressure-admission valve ro- ,tates du ring the operation of the engine, which direction is indicated bythe arrow placed on the said pressure-admission valve in Fig. 9,y

4and normally the said cut-off valveis arranged ynormal position in the direction opposite to the direction in which the shaft D, and consequently the pressure-admission valves G, is rotated during the operation of the engine,- is provided and comprises, preferably, a plate 60, which, as shown in Fig. 9, is mounted' upon and embraces the hub of the said cutoff valve. The said plate fills the said recess widthwise and extends from the rear side of the head of the said cut-off valve circumferentially and concentrically of the hub of the said valve in the direction opposite the direction in which `the shaft D is rotated to they IOO wall of the port N of the pressure-admission l valve comprising the said plate, which faces in the direction opposite to the direction in which the said valve is rotated during the operation of the engine. Means for preventing endwise displacement of the said plate 69 circumferentially of the hub of the said cutofi1 valve is provided and comprises (see Figs. 1 and 9) a screw 62, whose shank engages a correspondingly screw threaded hole 63, formed in the said plate, which screw extends through the pressure-ad mission valve Gr, provided with the said plate, and is arranged with its head at the back of the said valve, as shown in Fig. 1. The said plate 60 is flush at its outer side with the outer extremity of the said valve, and consequently participates in the formation of the outer end face of the said valve.

Surrounding the shafts D and It' at the adjacent ends of the said shafts (see Figs. 1, 10, 11, and .12) is a casing comprising two disks 7 0 and 80, which form opposite end walls, respectively, of the chamber 65, formed by and interiorly of the said casing. The disk 70, as shown in Figs. 10 and 12, is operatively mounted in any approved manner upon the shaft 7n and is arranged concentrically of the said shaft and extends, preferably, half-way round the shaft. The slot 72 is engaged by a screw-threaded pin 82, fixed to the disk 80, which is operatively mounted on the shaft 5() in any approved manner.

The pin-bearing disk 8O is provided at its periphery with an annular rim 83, which projects toward the slotted disk 70 and is arranged to form the surrounding wall of the chamber 65 and at its outer end has an internal annular flange 84, overlapped at its outer side by the disk 70, which is provided upon its inner side with an annular ange 7 4, surrounded by the fiange 84 of the rim 83. The pin 82 is secured to the flange 84 ofthe rim 83 of the inner disk 80. A nut 85 is mounted upon the outer end of the pin 82 at the outer side of the disk 70, and a washer 86 is interposed between the said nut and the outer side of the said disk 70. rlhe arrangement of the parts is such that during the operation of the engine the one or the other end wall of the slot 72 engages the pin 82, according as the engine-shaft is to be driven in the one direction or the other. The engagement of the pin 82 with the one or the other end wall of the engaging slot 72 obviously establishes operative connection between the disks 7 9 and 80, and consequentlybetween the shaft D and the shaft cf In the case illustrated the engine-shaft is driven in the direction indicated bythe arrow placed upon the said shaft in Fig. 2, and consequently the shaft /r is driven in the direction indicated by the arrow placed thereon in Figs. 2 and 12, and the pin 82 is engaged by that end wall of the slot 72 which faces in the direction in which the shaft 7c is rotated, and the shaft D is driven in the direction required to rotate the valves thereon in thc direction indicated by the arrows placed upon the said valves in Figs. -t and 9.

The shaft 50 extends into the chamber 65 a suitable distance and within the said chamber is operatively provided, as shown in Fig. 11, with two oppositely projecting` corresponding arms 65; Each shaft-arm 65 is operatively connected at its outer or free end by a link 66 with one end of a weight-bearing lever 67, which is fulcrumed at its opposite end, as at 68, to the disk 80. The two weightbearing levers are parallel and reversely arranged at opposite sides, respectively, of the shaft 50, and the shaft-arms 65, links 66, and the levers 67 and their weights 69 are all arranged within the chamber 65. Suitably-applied springs 75 act to retain the levers 67 in their normal position, which springs are arranged externally of the chamber 65 and attached at one end to the disk 8() and attached at their opposite ends by bolts 76 to the lever 67, and thedisk 80is suitably slotted, as at 77, to accommodate the location of the said bolts 76 during any actuation of the said levers.

The arrangement of the' parts is such that when the speed of the engine-shaft becomes greater than desired during the operation ol the engine the speed of the valve-bearing shaft D will have become correspondingly greater and result in the actuation of the weighted levers 67 by centrifugal force outwardly away from each other agaii'ist the action of the springs 75, and the outward movement of the weights 69 results in the actuation of the cut-olf valves 52 as required to cause said valves to more or less obstruct the passage-way through theports N of the pressureadmission valves Gr, and thereby reduce the quantity of fluid under pressure admitted to the engine-cylinder, so as to result in a. reduction of the speed of the engine-shaft, and when the normal speed of the engine-shaft again obtains the weighted levers 67 will again have been returned to their normal or inner position by the action ofthe springs 75.

The means employed for diverting steam of fluid under pressure from the chamber .l to the cham bers 8O at the outer end ol' the sleeves 0 (sce Figs. 3, 4, 7, and 9) comprises the l'ollowing: Tithin the surrounding wall of the bore of the hub It, centrally between the ends of the said hub, is formed an annular recess 90, and the said wall is also provided at each end of the hub with an annular recess 92, which is placed in communication with the central recess by a port 93, formed in and extending longitudinally of the hub. Communication between the central recess 9() and the chamber J is established by a port 91, which connects the said recess with the said chamber. The hub 55 of each eut-oli' valve 52 is provided within the surrounding wall of the bore of the said hub with tworecesses 95,

lOO

which are diametrically opposite and extend endwise through the said hub and communicate with the adjacent end recess 92 in the hub t. The recesses 95 are adapted to receive the key 55 of the said cut-off valve when the pressure-admission valves G are rotated in the direction opposite to the direction indicated by the arrows in Figs. 4 and 9, in which case the said cut-off valve will be normally set with its head 58 against the opposite end of the adjacent stop-forming plate 60. The recesses 95 in the cut-off valves constitute, therefore,the ports which establish communication between the end recesses 92 of the hub 7L and the chambers s in the valve-seat-forming partitions,v

and communication between the said chambers s and the chambers 30 is established by cross-sectionally small ports 96, formed in and extending longitudinally of and through the sleeves 0.

What I `claim isl. The combination, with the engine-cylining Shaft centrally between the ends of the valve casing; two fluid pressure ad mission valves formed upon opposite ends respectively of the said collar and provided each` with a port extending through the respective valve;- a iiu1d-pressure-rece1v1ng chamber formed within the valve-casing and around the aforesaid collar between the two pressure-admisvsion valves; two exhaust-valves arranged Within opposite ends respectively of the aforesaid bore and operatively mounted on the valve-bearing shaft and provided each with aY port extending through the respective valve; exhaust-chambers formed within the valvecasing and communicating with the ports in the exhaust-valves, and a valve-seat-forming partition snugly interposed between each exhaust-valve and the adjacent pressure-admission valve and provided with a port which extends through the partition, and the ports in the different partitions communicating with the different cylinder-ports respectively substantially as shown, for the purpose specified.

2. The combination, with the engine-cylinder, the piston within the cylinder; the engine-shaft operatively connected with the piston; the valve-casing arranged externally of the cylinder and provided interiorlylwith a bore which extends longitudinally of the valvecasing and having a fluid-pressure inlet and an exhaust-outlet, the two cylinder-ports connecting, at one end, with the aforesaid bore and opening, at the opposite end, into the interior chamber of 'the cylinder, and a valvebearing shaft arranged centrally and longitudinally of the valve-casing and operatively connected with the engine-shaft, of al collar operatively mounted onthe valve-bearing shaft centrally between the ends of the valveterposed between each exhaust-valve and the.

adjacent pressure-admission valve and provided with a port which extendsthrough the partition, and the ports in the different partitions communicating with the different cylinder-ports respectively, substantially as shown,

forthe purpose specified.

3. The combination, with the engine-cylinber; the piston within the cylinder; the engine-shaft operatively connected with the piston; the valve-casing arranged externally and longitudinally .of the cylinder and provided interiorly with a bore which extends longitudinally of the valve-casing; the two cylinderports connecting, at one end, with the aforesaid bore and opening, at the opposite end, into opposite ends respectively of the interior chamber of the cylinder, and a valve-.bearing shaft arranged centrally and longitudinally of the valve-casing and operatively connected with the engine-shaft, of two tluid-pressureadmission valves operatively mounted on the valve-bearing shaft a suitable distance apart `within the aforesaid bore and a suitable distance inwardly from opposite ends respectivelyof the valve-casing and provided each with a port extending through the respective valve; a iuid-pressure-receiving chamber formed within the valve-casing circumferentially of the valve-bearing shaft between the pressure admission valves; two exhaustvalves arranged within opposite e'ndsrespec- -tively ofy the aforesaid bore and operatively mounted on the valve-bearing shaft and provided each witha port extending through the respective valve; exhaust-chambers formed within the Valve-casing and communicating with the ports in the exhaust-valves, and a valve-seat -forming partition snugly interposed between each exhaust-valve and the adjacent pressure-admission valve and provided with a port which extends through the partition, and the ports in the different partitions communicating with the different cylinder.- portsLrespectively.

4. The combination, with the engine-cylinder; the piston within the cylinder; the engine-shaft operatively connected with the piston; the valve-casing arranged externally of the cylinder and provided interiorly with a bore which extends longitudinally of the valve-casing and having a fluid-pressure inlet and an exhaust-outlet; the two cylinder-ports connecting, at one end, with the aforesaid bore and opening, at the opposite end, into the interior chamber of the cylinder, and a valvebearing shaft arranged centrally and longitudinally of the valve-casing and operatively7 connected with the engine-shaft, of two fluidpressure-admission valves operatively mounted on the valve-bearing shaft a suitable distance apart within the aforesaid bore and provided each with a port which extends through the respective valve and communicates with the aforesaid fluid -pressure inlet; two exhaust-valves arranged within the aforesaid bore in suitable proximity to the different pressure-admission valves respectively and operatively mounted on the valve bearing shaft and provided each with a port which extends through the respective valve and communicates with the aforesaid exhaust-outlet, and a valve-seat-forming partition snugly interposed between each exhaust-valve and the adjacent pressure-admission valve and provided with a port which extends through the respective partition, and the ports in the different partitions communicating with the different cylinder-ports respectively, substantially as shown, for the purpose specified.

5. The combination, with the engine-cylinder; the piston within the cylinder; the engine-shaft operatively connected with the piston; the valve-easing arranged externally of the cylinder and provided interiorly with a bore which extends longitudinally of the valvecasing, and the two cylinder-ports connecting, at one end, with the said bore and opening, at the opposite end, into the interior chamber of the cylinder, of two rotary iiuidpressure-admission valves arranged a suitable distance apart within the aforesaid bore and a suitable distance inwardly from opposite ends respectively of the valve-casing; a fluidpressure-receiving chamber formed within the valve-casing between the pressure-admission valves; two rotary exhaustvalves arranged within opposite ends respectively of the aforesaid bore; exhaust-chambers formed within the valve-casing; a valve-seat-forming partition snugly interposed between each exhaust-valve and the adjacent pressure-admission valve and provided with a port which extends through the partition and the ports in the different partitions communicating with 4the different cylinder-ports respectively;

means establishing operative connection between the aforesaid valves and the engineshaft, and ports in the valves to exhaust steam from one end of the cylinder through the port in one of the partitions while steam is admitted through the port in the other partition into the other end ol the cylinder.

6. rl`he combination, with the engineeyliuder; the valve-casing arranged externally of the cylinder and provided interiorly with a. bore extending' longitudinally of the valvecasing, and two cylinder-ports connecting, at one end, with the aforesaid bore and opening, at the opposite end, into the interiorchamber of the cylinder, of two rotary duid-pressureadmission valves arranged a suitable distance apart within the aforesaid bore and provided each with a fluid -pressureconducting port which extends through the respective val ves; two rotary exhaustvalves arranged within the aforesaid bore in suitable proximity to the di'erent pressure-admission valves respectively and provided each with'an exhaust-port which extends through the respective valves, a valve-seat-forming partition snugly interposed between cach exhaust-valve and the adjacent pressure-admission valve and provided with a port which extends through the partition, and the ports in the dill`erent partitions communicating with the diiierent cylinderports respectively, and means for simultaneously rotating the said valves.

7. The combination, with the engine-cylinder; the valve-casing arranged externally of the cylinder and provided interiorly with a bore extending longitudinally of the valveeasing, and the two cylimlcr-ports connecting, at one end, with the aforesaid bore and opening, at the opposite end, into the interior chamber of the cylinder, of two rotary pressure-admission valves arranged a suitable distance apart within the aforesaid bore and provided eaeh with a port extendingthrough the respective valves; two rotary exlnuist-valves arranged within the aforesaid bore and provided eaeh with a port and arranged in suitable proximity to the different pressure-:ulmission valves respectively, which exhaustvalves are each shiftable toward the adjacent pressure-admission valve; a valve-seat-forming partition snugly interposed between each exhaust-valve and the adjacent pressure-:ulmission valve and provided with a port which extends through the partition and the ports in the different partitions communicating with the different cylinder -ports respectively; means acting to hold the cxhaustval ves against the said partitions, and means for simultaneously operating the aforesaid valves.

8. The combination, with the engine-cylinder; the valve-casing arranged externally of the cylinder and provided interiorly with a bore extending longitiulinally of the valvecasing, and the two cylimlcr-ports connecting, at one end, with the aforesaid bore and opening, at the opposite end, into the interior chamber of the cylinder, of two rotary fluidpressure-admission valves arranged a suitable distance apart within the aforesaid bore and provided with a port extending through the respective valves; a fluid pressure-receiving chamber communicating Withl the ports in the pressure-admission valves; two rotary exhaust-valves arranged Within the aforesaid bore in suitable proximity to the different pressure-admission valves respectively,which exhaust-valves are each shiftable toward the adjacent pressure-admission valves and provided each with a port extending through the respective exhaust-valves; avalve-seat-forming partition snugly interposed between each exhaust-valve and the adjacent Apressure-admission valve and provided With a port which extends through the partition and the ports in the different partitions communicating With the diderent cylinder ports respectively; means Wherebysome iiuid under pressure is diverted from the aforesaid fiuid-pressure-receiving chamber to both exhaust-valves and applied to hold the said valves against the said partitions, and means for rotating the aforesaid Valves simultaneously.

9. The combination, With the engine-cylinder; the engine-shaft; the valve-casing having a fluid-pressure inlet and an exhaust-outlet; a cylinder-portopening into the interior chamber of the cylinder, and a valve-bearing shaft extending into the valve-casing and operatively connected with the engine-shaft, of a partition'within the valve-casing and surrounding the valve-bearing shaft, Which partition is provided with a port which extends endwise therethrough and communicateswith the aforesaid cylinder-port; an exhaust-valveseated against one endof the said partition and operatively mounted on the valve-bearing shaft; an exhaust-chamber formed in the valve-casing and communicating With the aforesaid exhaust-outlet; a fluid-pressure-ad-f mission valve operatively mounted on the valve-bearing yshaft at the opposite end of the aforesaid partition; a iiuid-pressure-receiving chamber formed in the valve-casing and communicating With the aforesaid iiuidpressure inlet, and the valves being provided Withports to admit steaminto and exhaust' from the cylinder through the port in the partition. Y

l0. The combination, vvith the engine-cylinder; the engine-shaft; the valve-casing having a Huid-pressure inlet and an exhaust-outlet; a cylinder-port connecting With the intel rior chamber of the cylinder, and a valve'- bearing shaft extending into the valve-casing and operatively connected With 'the engineshaft, of a partition Within the valve-casing and aroundth'e valve-bearing shaft, which partition is provided with a port Which extends endwise therethrough and communicates with the aforesaid cylinder-port; Van exhaust-,valve seated against one end of` the said partition and operatively mounted on the valve-bearing shaft and having a port which extends through the valve and communicates lsaid valve and communicates with the aforesaid iiuid-pressure inlet..

l1. The combination, with the engine-cylinder; the valve-casing having a fluid-pressure inlet and an exhaust-outlet, and a cylinder-port opening into the interior chamber of the cylinder, of a partition with the valve-casing, Which partition is'provided With a port which extends therethrough and communicates with the aforesaid cylinder-port; an exhaust-valve seated against the said partition at one end of the port in the partition and having a port which extends through ithe valve and communicates with the aforesaid exhaust-outlet; a fluid-pressure-admission valve seated against the aforesaid partition at the opposite end of the port in the partition and provided with a port which extends through the said valve and communicates with the aforesaid fluidpressure inlet, and Ameans for operating the valves. i

l2. The combination, With the engine-cylinder; the valve-casing provided interiorly with a bore which extendslongitudinallyof the said casing, and having a fluid-pressure inlet and an exhaust-outlet, anda cylinder-port connecting, at oneend, with the said bore and opening, at its opposite end, into the interior chamber of the cylinder, vof an annular partition Within and transversely of the aforesaid bore, which partition is provided with a port 1 which extends endWise therethrough and communicates with the aforesaid cylinder-port; a

jrotary exhaust-valve seated against one' end of the said partition and having a port which extends through the valve and communicates with the aforesaid 'exhaust-outlet; a rotaryv iuid-pressure-admission valve seated against the opposite end of the partition and provided with a port which extends through the said valve, and communicates with the' aforesaid fluid-pressure inlet, and means for operating the aforesaid valves. Y

1 3. The combination, With the engine-cylinder; the valve-casing provided interiorly with a bore Which'extends longitudinally of the said casing and having a fluid-pressure inlet and an exhaust-outlet, and a cylinder-port connecting the said bore with the interior chamber of the cylinder, of a partition snugly {itting Within the said bore and having a limited endWise shiftability, which partition is provided With a port Which extends therethrough and communicates With the aforesaid cylinderport; a rotary exhaust-valve seated and bearing against one end of the said partition and having a port for conducting exhaust-steam from the port in the partition; a rotary iuidpressure-admission Valve seated against the opposite lend of the'partition and provided TOO with a port for conducting live steam into the partition; means acting to press the exhaustvalve against the said partition, and means for operating the valves.

14. The combination, with the engine-cylinder; the valve-casing provided interiorly with a cylindrical bore which extends longitudinally of the said casing, and having a Huidpressure inlet and an exhaust-outlet, and a cylinder-port connecting the said bore with the interior chamber of the cylinder, of a cylindrical partition snugly fitted within the aforesaid bore and having a limited endwise shiftability, which partition is provided with a port which extends endwise therethrough and communicates with the aforesaid cylinderport; a rotary exhaust-valve seated and bearing against one end of the said partition and having a port for conducting exhaust-steam from the port in the partition; a rotary fluidpressure-admission valve seated against the opposite end of the said partition and provided with a port for conducting live steam to the port in the partition; means for operating the valves, and means for preventing circumferential displacement of the aforesaid partition.

15. The combination, with the engine-cylinder; the engine-shaft; the valve-casing provided interiorly with a bore which extends longitudinally of the said casing and having a fluid-pressure inlet and an exhaust-outlet; a cylinder-port connecting the said bore with the interior chamber of the cylinder, and a valve-bearing shaft extending into and longitudinally of the valve-casing and operatively connected with the engine-shaft, of a parti'- tion arranged Within the aforesaid bore and surrounding' valve-bearing shaft and provided with a port which extends through the partition and communicates with the aforesaid cylinder-port; an exhaust-valve seated against one end of the said partition and comprising an endwise-shiftable sleeve which is operatively mounted on the valve-bearing shaft and a disk which is formed upon the inner end of the said sleeve and has a port `for conducting exhaust-steam from the port in the partition, which sleeve is provided at its outer end with an external annular flange having an outwardly-projecting annular rim; a ring larger diametrically than and surrounding the valvebearing shaft within and engaging the inner periphery of the aforesaid rim; the fluidpressure receiving chamber formed within the said ring and having an outer end wall borne against by the said ring and arranged a suitable distance outwardly from the aforesaid rim; means acting to retain the said ring against the said wall and acting to retain the exhaust-valve against the aforesaid partition; a fluidpressure-admission-valve operatively mounted on the valve-bearing shaft at the opposite end of the aforesaid partition and provided with a port for conducting steam to the port in the partition, and means for supplying a small amount of fluid under pressure to the aforesaid fluid-pressure-receiving chalnher.

16. The combination, with the engine-cylinder; the engine-shaft; the valve-casing provided interiorly with a bore which extends longitudinally of the said casing and having a Huid-pressure inlet and an exhaust-outlet; a cylinder-port connecting` at one end, with the said bore and opening, at its opposite end, into the interior chamber of the cylinder, and a valve-bearing shaft extending into and longitudinally of the valve-casing and operatively connected with the enginc-slmft` of a partition within the aforesaid bore and around the valve-bearing shaft and provided with a port which extends through the partition and communicates with the aforesaid cylinderport; an exhaust-valve seated against one end of the said partition and comprising an endwise -shiftable sleeve which is operatiwly mounted on the valve-bearing shaftand a dish which is borne by the inner end of the said sleeve and has a port which extends through the disk and communicates with the aforesaid exhaust-outlet, which sleeve is provided, at its outer end, with an external annular flange having an outwardly-projecting annular rim;

a ring larger dametrically than and surrounding the valve-bearing shaft within and ongaging the inner periphery of the aforesaid rim; the Huid pressure -receiving chamber formed within the said ring and having` an outer end wall borne against'l by the said ring and arranged a suitable distance outwardly from the aforesaid rim; means acting to retain the said ring against the said wall and acting' to retain the exhaust-valve against the aforesaid partition and a iluid-pressurc-:ulmission valve operatively mounted on the valve-hearing shaft at the opposite end of the aforesaid partition and provided with a port which extends through the said valve and communicates with the aforesaid fluid-pressure inlet.

17. The combination,with the engine-cylinder; the engine-shaft; the valve-casing provided interiorly with a bore which extends longitudinally of the said casing and having a fluid-pressure inlet and an exhaust-outlet; a cylinder-port connecting, at one end, with the said bore and opening, at its opposite end, into the interior chamber of the cylinder, and a valve-bearing shaft extending into and longitudinally of the valve-casing and operatively connected with the engine-shaft, of a partition within the aforesaid bore and around the valve-bearing shaft and provided with a port which extends endwise through the partition and communicates with the aforesaid cylinder-port; an exhaust-valve seated against one `end of the said partition and having a sleeve which is operativelymounted on and shiftable endwise of the valve-bearing shaft, which valve has a port which extends endwise through the valve and communicates with the aforesaid IOO exhaustoutlet, ar iuid pressure receiving chamber formed next adjacent to the outer.

18. The combination, with the engine-cylin-V der; the engine -shaft; the valve-casing provided interiorly with a bore which extends longitudinally7 of the said casing and havinga fluid-pressure inlet and an exhaust-outlet; a cylinder-port connecting the said bore with the interior chamber of the cylinder, and a valve-bearing shaft extending into and longitudinally of the valve-casing and operatively connected with the engine-shaft, of apartition arranged within the aforesaid bore and extending circumferentially of t'he valve-bearing shaft, which partition is provided with a port which extends endwise therethrough and communicates with the aforesaid cylinderport; an exhaust-valve seated andyieldably held against one end of 4the said partition, which valve is operatively mounted on the valve-bearing shaft and has a port for conducting exhaust-steam fromthe -port in the partition, and afiuid-pressure-admission valve operativelymounted on the, valve -bearing shaft at the opposite end of the aforesaid partition and provided with a port for conduct-vk ing live steam into the port in the partition, substantially as shown and described. v

19. The combination,- with the engine-cylinder; the valve-casing, and a cylinder-port opening into the interior chamber of the cylinder, of a partition arranged within and transversely of the valve-casing and provided with a port which extends through the -partition and communicates with the aforesaid cylinderport; a rotary exhaust-valve arranged at and yieldablyheld against one end of the partition and provided with an exhaust-port; a rotaryl iiuid-pressure-admission valve arranged at the opposite end of the partition and provided with a fluid-pressure-conductingpo-rt; means for feeding iiuid under pressure to the port in the pressure-admission valve,-and means for operating the valves, all arranged substantially as shown, for the purpose specified.

20. The combination, with'the engine-cylinder; the valve-casing having a fluid-pressurereceiving chamber and an exhaust-chamber, and a cylinder-port opening intol the interior chamber of the cylinder,of` a partition arranged within and transversely of the valvecasing between the fluid-pressure-receiving chamber and exhaust-chamber and provided with a port which extends through the partition and communicates-with the cylinderport;

a rotary exhaust-valve seated and lyieldably held against one end of the partition and provided with an exhaust-port; a rotary fluidpressure-admission valve seated against the opposite end of Vthe partition and provided with a port which communicates with the fluid-pressu1re-receiving chamber; means for operating the valves, and means whereby some Huid under pressure is conducted from the said. iiuid-pressure-receiving chamber successively through the pressure-admission valve, partition and exhaust-valve and applied to hold the exhaust-valve against the partition.

21. The combination, with the engine-cylinder; the engine shaft; the valve-casing having a fluid-pressure-receiving chamber and an exhaust-chamber; the ytwo cylinder-ports opening into opposite ends respectively of the interior chamber of the cylinder, and the valve-bearing shaft extending into the valvecasing and operatively connected with the engine-shaft, of two partitions fitting snugly within the valve-casing and provided each with spective partition and also concentrically of the valve-bearing shaft, and the ports in the different partitions communicating with the different cylinder-ports respectively; valves operatively mounted on the valvebearing shaft and arranged to control the exhaust from and admission of live steam to the port in the partition; adjustable plates for controlling the size and arrangement of the'ends of curing the said plates in thc desired adjustment. Y

E22. The combination, with the engine-cylinder; thevalve-casing having a iiuid-pressurereceiving chamber and an exhaust-chamber and the two cylinder-ports opening into opposite ends respectively ofthe interior chamber of the' cylinder, of twov partitions fitting snugly within the valve-.casing and provided each-with a port which extends endwise th rough the respective partitions,and the ports` in the different partitions communicating with `the different cylinder-ports respectively; a rotary exhaust-valve having bearing against one end ofeach partition and provided with a portwhich communicates withthe aforesaid exhaust chamber and extends through the valve; a rotary iuid-pressure-admission valve seated against the opposite end of the said partition and provided with a port which communicates with the aforesaid Huid-pressurereceiving chamber and extends through the valve; and eachpartition provided, in each end thereof, with two valve-seat-forming adjustable plates; means for securingthe said plates in the desired adjustment, and means for operating the valves.

23.' The combination, with the engine-cylinder;,th`e valve-casing having-a fluid-pressurereceiving chamberand' an exhaust chamber,

vopposite ends respectively ofthe interior a port which extends endwise through the rethe ports in the partitions, and means for se- TOO and the two.- cylinder-ports opening into V chamber of the cylinder, of two partitions fitting snugly within the valve-casing and provided each with a port which extends endwise through the respective partition, and the ports in the different partitions communicating with the different cylinderports respectively; a rotary exhaust-valve arranged at one end of each partition and provided with a port for conducting exhaust-steam from the port in the said partition; a rotary fluid-pressure-admission valve arranged at the opposite end of the said partition and provided with a port for conducting live steam to the port in the said partition; adjustable plates for controlling the size and arrangement of the outer ends of the ports in the partitions; means for securing the said plates lin` the desired adjustment, and means for operating the valves.

24. rlhe combination, with the engine-cylinder; the valve-casing having a fluid-pressurereeeiving chamber and an exhaust-chamber and the two cylinder ports opening into opposite ends respectively of the interior chamber of the cylinder, of two partitions fitting snugly within the valve-casing and provided each with a port which extends endwise through the respective partition, and the ports in the different partitions communicating with the different cylinder-ports respectively; a rotary exhaust-valve arranged at one end of each partition and provided with a port for conducting exhaust-steam from the port in the said partition; a rotary iiuid-pressure-admission valve arranged at the opposite end of the said partition and provided with a port for conducting live steam to the port in the said partition; means for operating the valves; adjustable plates for controlling the size and arrangement of the inner ends of the ports in the partitions, and means for securing the said plates in the desired adjustment.

25. The combination, with the engine-cylinder; the engine-shaft; thel valve-casing having a fluid-pressure-receiving chamber and an exhaust-chamber; a cylinder-port opening into the interior chamber of the cylinder, and,

a valve-bearing shaft extending into thevalvecasing and operatively connected with the engine-shaft, of a partition snugly fitting within the valve-casing and surrounding the valvebearing shaft, which partition is provided with a port which extends endwise through the partition and also concentrically of the valvebearing shaft and communicates with the aforesaid cylinder-port; an exhaust-valve seated against one end of the said partition and operatively mounted on the valve -bearing shaft, which valve is provided with a port which extends through the valve and also concentrically of the valve-bearing shaft and communicates with the aforesaid exhaust-chamber; a fiuid-pressure-admission valve operatively mounted on the valve-bearing shaft at the opposite end of the partition and provided with a port which extends through the said valve and communicates with the aforesaid fluid -pressurc-receiving chamber, and the aforesaid partition comprising an annular block surrounding the valve-bearing shaft and provided, in each end thereof, with a circular recess extending circumferentially of the valve-bearing shaft; two valve-seat-forming plates arranged within each of the said recesses and extending concentrically of the shaft, and means for securing the said plates in the desired adjustment.

26. rlhe combination, with the engine-cylinder; the valve-casing having a fluid-pressurereceiving chamber and an exhaust-chamber, and a cylinder-port opening into the interior chamber of the cylinder, of a partition snugly fitting within and arranged transversely of the valve-casing, which partition is provided with a port which extends through the partition and communicates with the aforesaid eylinder-port; an exhaust-valve seated against the said partition at one end of the port in the partition and provided with a port which extends through the valve and communicates with the aforesaid exhaust-chamber; a fluid-pressure-admission valve at the opposite end of the port in the partition and provided with a port which extends through the said valve and communicates with the aforesaid uid-pressure-receiving chamber, and the partition comprising a block provided with a circular recess, plates arranged within and extending endwise of the said recess; means for securing the said plates in the desired adjustment, and means for operating the valves.

27. The combination, with theengine-cylinder; the valve-casing having a Huid-pressurereceiving chamber and an exhaust-chamber, and a cylinder-port opening into the interior chamber of the cylinder, of a partition snugly litting within the valve-casing, which partition is provided with a port which extends through the partition and communicates with the aforesaid cylinder-port; au exhaust-valve seated against the said partition at one end of the port in the partition and provided with a port which extends through the valve and communicates with the afore- .said exhaust-outlet; a fluid-pressure-admission valve arranged at the opposite end of the port in the partition and provided with a port which extends through the valve and communicates with the aforesaid iluid-pressurc-receiving chamber, and the partition being provided, with adjustable plates controlling the size and arrangement of one end of the port in the partition; means for securing the said plates in the desired adjustment, and means for operating the valves.

28. The combination, of the engine-cylinder; the valve-casing having a [luid-pressurereceiving chamber and an exhaust-chamber, the two cylinder-ports opening into the interior chamber of the cylinder, two partitions within the valve-casing and provided each with a port which extends through the respective partition, and the ports in thediferent partitions communicating with the diiferent cylinder-ports respectively; an exhaust-valve n through the valve; a fluid-pressure-admission valve arranged at the opposite end of the partition and provided with a lport which communicates'with the aforesaid Huid-pressurereceiving chamber and extends through the said valve; means for operating the valves, and means whereby the commencement and the termination of the period of fluid-pressure admission to either cylinder-port can be changed or regulated independently of each other.v v

29. The combination, of the engine-cylinder; the valve-casing having a fluid-pressurereceiving-chamber and an exhaust-chamber; the two cylinder-ports opening into the interior chamber of the cylinder; two partitions within the valve-casing and provided each with a port which extends through the respective partitionand the ports in the different partitions communicating with the different cylinder-ports respectively; an exhaust-valve having bearing against the said partition vat one end of the port in the partition and provided with a port which communicates with the aforesaid exhaust-chamber and extends through the valve; a Huid-pressure-admission valve arranged at the opposite end of the partition and provided with a port which communicates with the aforesaid fluidpressure receiving chamber and extends through the s'aid valve; means for voperating the valves, and means whereby the beginning, duration and termination of the period of fluid-pressure admission to yeither cylinderport can be changed or regulated Aindependently of the commencement, duration and terminationof the period of iuid-p'ressure admission to the other cylinder-port.l

30. The vcombination, of the engine-cylinder; the valve-casing having a Huid-pressurereceiving chamber andan 'exhaust-chamber; the two cylinder-ports opening' into the interior chamber ofthe cylinder; two partitions within the valve-casing and provided each with a port which extends through the respective partition and the ports inthe different partitions communicating with the dierent cylinder-ports respectively; an exhaust-valve having bearing against the said partition at one end of the port in the partition and-provided with a port which communicates with thc aforesaid exhaust-chamber and extends through the valve; a fluid-pressure-admission valve arranged at the opposite end of the partition and provided with ya port which communicates with the aforesaid fluid-pressurereceivingA chamberr and: extends through? the said valves; means for operating the valves,

kand means whereby the beginning, duration and termination of the period of fluid-pressure admission to either cylinder-port can be changed or regulated independently of the termination, duration and commencement of the period of release or exhaust through the other cylinder-port.

31. The combination, of the engine-cylinder; the valve-casing having afluid-pressurereceiving chamber and an exhaust-chamber; the two cylinderports opening into the interior chamber of the cylinder;'two partitions vwithin-the valve-casingand provided each with a port which extends through the respective partition and the ports in the different partitions communicating with the different cylinder ports respectively; an exhaust valve having bearing against the said partition at one end of the port in the partition and provided with a port whichcommunicates with the aforesaid exhaust chamber and extends through the Valve; a fluid-pressure-admission valve arranged at the opposite end of the partition and provided with a port which communicates with the aforesaid fluid-pressurereceiving chamber and extends through the said valve; meansfor operating thevalves,

and means whereby the commencement Aand the termination of the period of exhaust or release through either cylinder-port can be changed or regulated independently of each other'.

32. rlhe combination, of the engine-cylinder; the valve-casing having afluid-pressurereceiving chamber and an exhaust-chamber; the two cylinder-ports opening into the interior chamber of the cylinder; two partitions within the valve-casing-and provided each with a port which extends through the respective partition and the ports in the different partitions communicating with the different cylinderports respectively; an exhaustvalve having bearing against the said partition at one end of the port in the partition and provided lwith a port which communicates with the'aforesaid exhaust-chamber and extends through the valve; a fluid-pressure-admission valve arranged at the opposite end of the partition and provided with a port which communicates with the'aforesaid fluid-pressurereceiving chamber and extends through the said valve; means for operating the valve, and means whereby the beginning, duration and termination .of the 'period of exhaust or release through either cylinder -port can be changed or regulated independently of the commencement, duration and termination of the period of exhaust or release inexhausting through the other cylinder-port.

33. rlhe combination, of the engine-cylinder; the valve-casing havingafiuid-pressurereceivingchamber and an exhaust-chamber; the two cylinder-ports openinginto theinterior chamber of the.- cylinder; two partitions'iit- IOO lIO

ting snugly within the valve-casing and pronicates with the aforesaid exhaust-chamber and extends through the valve; a fluid-pressure-admission valve arranged at the opposite end of the partition and provided with a port which communicates with the aforesaid liuid-pressure-receiving chamber and extends through the said valve; means for operating the valves, and means whereby the beginning, duration and termination of the period of exhaust or release through either cylinder-port can be changed or regulated independently of the termination, duration and commencement of the period of Huid-pressure admission to the other cylinder-port.

34. The combination, with the engine-cylinder; the engine-shaft; the valve-casing provided interiorly with a bore extending longitudinally of the valve-casing; two cylinderports opening into opposite ends respectively of the interior chamber of the cylinder and connecting with the aforesaid bore a suitable distance apart longitudinally of the valve-casing; a valve-bearing shaft extending into and longitudinally of the valve-casing fromentside of the said casing and operatively connected with the engine-shaft; two partitions arranged within and transversely of the aforesaid bore and provided each with a port which extends through the respective partition, and the ports in the different partitions communicating with the different cylinder-ports respectively; two exhaust-valves provided each with an exhaust-port and seated against the different partitions respectively at the exhausting end of the port in the respective partition and operatively mounted on the aforesaid valVe-bearing shaft; two fluid-pressureadmission valves operatively mounted on the said valve-bearing shaft at the Huid-pressuretaking end of the port in the different partitions respectively and provided each with a uid-pressure-conducting port, and means for supplying liuid under pressure to the ports in the pressure admission valves, of another valve-bearing shaft arranged within and extending longitudinally of the first-mentioned valve-bearing shaft; governing mechanism establishing operative connection between the inner valve-bearing shaft and the outer valvebearing shaft, and two cut-0E valves arranged within the valve-casing and operatively connected with the inner valve-bearing shaft and arranged to regulate the supply of iuid under pressure to the ports in the dierent partitions respectively.

35. The combination, with the engine-cylinder; the engine-shaft; the valve-casing provided interiorly with a bore extending longitudinally of the valve-casing; two cylinderports opening into opposite ends respectively of the interior chamber of the cylinder and connecting with the aforesaid bore a suitable distance apart longitudinally of the valve-casing; a valve-bearing shaft extending into and longitudinally of the valve-casing' from outside of the said casing and operatively connected with the engine-shaft; two partitions arranged within and transversely of the aforesaid bore and provided each with a port which extends through thc respective partition, and the ports in the different partitions conu'nuuieating with the different cylinder-ports respectively; two exhaust-valvcs provided each with an exhaust-port and seated against the dill'erent partitions respectively at the exhausting end of the port in the respective partition and operatively mounted on the aforesaid valvebearing shaft; two iiuid -prcssure-admission valves operatively mounted on the said valvebcaring shaft at the iiuid-pressure-taking end of the port in the different partitions respectively and provided each with a fluid-pressureconducting port, and means for supplying luid under pressure to the ports in the pressureadmission valves, of another valve-bearing shaft arranged within and extending longitudinally of the first-mentioned valve-bearing shaft; governing mechanism establishing operative connection' between thc inner valvebearing shaft and the outer valvchearing shaft; two cut-off valves arranged within the valve-casing and mounted on the outer valvebearing shaft and arranged to regulate the supply of iiuid under pressure to the ports in the different partitions respectively; keys establishing operative connection between the cut-off valves and the inner valve-bearing shaft and extending from within the inner valvebearing shaft through the outer wilvc-bearing shaft into the said valves, and the outer valvebearing shaft being slotted circumferentially to accommodate the location of the keys.

36. The combination, with the engi nc-cylinder; the engine-shaft; the valve-casing provided interiorly with a bore extending longitudinally of the valve-casing; two cylinderports opening into opposite ends respectively of the interior chamber of the cylinder and connecting with the aforesaid bore a suitable distance apart longitudinally of the valve-cas ing; a valve-bearing shaft extending` into and longitudinally of the valve-casing from outside ofthe said casing; two partitions arranged within and transversely of the aforesaid bore and provided each with a port which extends through the respective partition, and the ports in the different partitions communicating with the different cylinder-ports respectively; two exhaust-valves provided each with an exhaustport and seated against the different partitions respectively at the exhausting end of the port in the respective partition and operatively IOC lof

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