US738237A - Piston-valve or similar structure. - Google Patents

Description

No. 738,237. PATENTED SEPT. 8, 1903 U. REEVES. 'PISTON VALVE 0R SIMILAR STRUCTURE.

APPLIOATIOH FILED JUNE 17. 1902.

NO MODEL.

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UNITED STATES Tatented September 8, 1903 PATENT OFFICE.

CLIFTON REEVES, OF TRENTON, NEYV JERSEY.

SPECIFICATION forming part of Letters Patent No. 738,237, dated. September 8, 1903 Application filed June 1'7 1902. Serial No. 112,045. (No model.)

To all whom it may concern:

Be it known that I, CLIFTON REEvEs, a citizen of the United States, residingin Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful Improvements in Piston-Valves or Similar Structures, of which the following is a specification.

This invention relates to valves; and it consists,substantially, in the improvements hereinafter particularly described.

Though applicable to other similar structures, my improvements have reference more especially to piston-valves for steam and other fluid engines; and one of the principal objects of the invention is to provide a structure of this kind which is elfective and reliable under all conditions of use and one which is simple in construction, besides being light in Weight and comparatively inexpensive to manufacture.

A further object is to provide a structure of the character referred to possessing a comparatively limited number of parts or elements and one in which the liability to breakage or loosening of said parts or elements is greatly reduced or lessened.

A further object of the invention is to provide means for effectually compensating for or taking up any wear occurring between the operative or working faces of the valve structu re and the seats therefor in the steam-chest or cylinder, and also to provide means whereby the valve structure may be easily and quickly fitted within the steam-chest or cylinder and readily connected up for use.

A still further object is to provide means whereby the adjustments and fastening of the operative or working face at each head of the valve may be effected separately from orindependently of the other, and also whereby such adjustments may be performed at one and the same valve-head and while the structure is in working position.

The above and additional objects are attained by means substantially such as are illustrated in the accompanying drawings, in which Figure l is a side view of my improved piston-valve or analogous structure, said view being in part elevation and in part longitudinal section and showing very clearly the construction of the valve-heads, together with the devices or means for effecting adjustments of the packing-rings which constitute the working faces of the valve, said rings being cooperatively organized with said heads and said adjusting devices. Fig. 2 is a view of my improved piston-valve or analogous structure partly broken away and looking at the same from the end thereof at the left of Fig. 1. Fig. 3 is an end view looking at the structure from the end thereof at the right of Fig. 1. Figs. 4 and 5 are respectively atop plan and aside viewof a portion of one of the packing-ringsto show the means employed for preventing leakage of the valve structure and also whereby steam or other motor fluid is prevented from access to the inner side of the packing-rings or the interior of the valve. Fig. 6 is a viewin perspective indicating more clearly the construction and organization of the elements referred to in Figs. 4 and 5.

Before proceeding with a more detailed de= scription it may be stated that While I have herein shown my improvements applied to a piston-valve for steam and other fluid engines the same are equally applicable to many forms of pump and other pistons or plungers, and hence my invention is to be understood as comprehending all such and analogous structures involving a body for rotation or reciprocation within a chest or cylinder and having as accompaniments thereof or in combination therewith expansible rings or similar devices constituting the working or guiding faces of the body and moving against or in contact with the inner surface of said chest or cylinder.

My improved piston-valve or similar structure comprises a valve-body, and preferably two heads located at the ends of the body, and combined with said body and each of said heads is a packing-ring of special construction and an adjusting or expanding device therefor, also of special construction. Extending lengthwise of the body of the valve is a rod or shaft connecting with said adjusting or expanding devices and to one of the valve-heads suitable attachment of one end of the valve-rod is made. The rod or shaft connecting the adjusting or expanding devices cooperates with each of said devices in the adjustment or expansion of the pack- IUU ing-rings, and the construction and organization ofthe component elementsor mechanisms of my improved piston-valve are such that the adjustment or expansion of the packingring at one valve-head may be performed without in any manner affecting or interfering with the packing-ring at the other valvehead. The construction and organization of the adjusting or expanding devices are also such, however, that the adjustment or eX-.

pansion of both packing-rings may be effected simultaneously, if desired, with but little change or alteration, as will appear hereinafter. I also employ locking devices of special embodiment for securing each of the adjusting or expanding devices in place after the same has been operated to expand the ring with which it cooperates, and the parts or elements of the whole structure are so fitted and adapted one to the other that no looseness or derangement thereof is had during the working of the structure. Still further, I employ simple and effective devices cooperating with the ends of the expansible packing-rings, so as to prevent leakage of the valve and also preventing steam or other motor fluid from passing into the valve, it being here observed that the outer surfaces of said expansible packing-rings constitute the operative or working faces of the valve or similar structure, passing as they do back and forth across the ports in the steam-chest or cylinder (not shown) in a manner Well understood.

Specific reference being had to the accompanying drawings by the designating characters thereon, A represents the body of my improved piston-valve or analogous structure, at the ends of which are fitted in any suitable manner the valve-heads B and O. The said body A is preferably tubular and contracted for the greater part of its length, as shown, leaving the end portions a and a thereof somewhat enlarged or flaring and faced off at the edges 1) and b, and extending longitudinally of and within the body is a rod or shaft D, which is of special construction, as will be explained, and which cooperates with the adjusting or expanding devices E and F for the expansible packing-rings G G, both the said devices and the said rings being also specifically referred to hereinafter.

The valve-head B consists of a circular disk of suitable dimensions, preferably beveled or reduced in thickness at the edge, as indicated at c, and is formed with a central circular opening (I, through which passes the inner end portion 6 of the valve or other rod H, said rod being formed or provided with a flange or collar f, the inner face of which abuts the outer or adjacent face of the hub portion 9 of said valve-head B. The said inner end portion of the valve-rod H is screwthreaded at h fora suitable distance, and the fastening of said rod to the valve-head B is effected, preferably, by two check or lock n u ts ii, the outer face of the formerof which abuts the inner or adjacent face of the said hub portion g, or instead of this means of attachmentthe said valve-head B may be keyed or otherwise secured to the said valve or other similar rod H, as is apparent. The outer surface of the expansible packing-ring G between the edges thereof is straight and parallel with the axis or sides of the shaft H, while the inner surface of said ring is tapered or convergent from the inner edge to the outer edge thereof, thus giving to the sides of the opening in the ring a conical form, as shown, the smaller inner diameter of the ring being adjacent the inner surface of the valvehead B. The said valve-head is formed or provided diametrically at or near the edges thereof with flush portions Z, in which are formed smooth-bored openings m for the passage of bolts or pins 71, the inner end portions 01' of which are threaded a suitable distance for screwing into threaded openings therefor in projections 0 at corresponding positions on the exterior of the enlarged or flared end a of the body A of the valve. The said bolts or pins 11 also pass through corresponding smooth-bored openings 8, formed in bearing portions or offsets 20, disposed or located at corresponding points at the inner surface of a substantially hollow cone M, which forms a part of the adjusting or expanding device E at the said valve-head B. The outersurface of the cone M fits the inner conical surface of the said expansible packing-ring G, the said cone being considerably less in width than the said packing-ring, and the sides or edges of the latter fit closely or snugly between the edge Z) of the enlarged end a of body A and the inner side of the valve-head B, as shown, the body of the packing-ring being also of depth or thickness sufficient to bring the outer or working face thereof considerably beyond the plane of the periphery or edge of said valve-head B. The said adjusting or expanding device E is further constituted of a disk e, having an enlarged central recess 6 and also with an inwardly-extending spider E having attached thereto or integral therewith a ring 6 the inner surface of which closely fits around the portion d of the rod or shaft D and the edges of which snugly fit between the adjacent or inner surfaces of collars or flanges d and d, formed with or fastened to said rod or shaft the proper distance apart.

From the construction and organization of elements thus far described it is apparent that if bodily movement be imparted to the rod or shaft D in the direction of the valvehead B the said adjusting device E will be correspondingly moved and the ring G thereby expanded, it being understood that said ring is divided or split-as indicated at 2, for instance. The manner of so operating said rod or shaft D for this purpose will be hereinafter fully explained, as will also the means for locking the parts to the positions to which they may be moved.

ICO

The rod or shaft D is formed at the end thereof opposite to that above referred to with preferably a squared portion (1 for application thereto of a suitable wrench, and at a suitable distance from this end said rod or shaft is also formed with a screw-threaded section (V, as shown. Fitting upon this end of said rod or shaft is a sleeve N, provided at its outer end with a flange or collar n formed with notches or serrations n at the edge thereof, and which is also formed, preferably at opposite diametric points, with threaded openings in which are fitted setscrews 1%, the purpose or function of which will presently appear. Said sleeve N is provided interiorly with a screw-thread 9?, fitting the screw-threaded section of rod or shaft D, and the sleeve is also formed externally for a considerable part of its length with a screw-thread 01 a relatively small area of the external surface of the sleeve being left smooth or plain, as indicated at 11 The valve-head O is located at this end of the structure, as is understood, and the said head comprises a circular disk or plate 5, having a central opening 6, and setting inwardly from said plate and partially forming the sides of said opening is a flange 7, which integrally unites the said disk or plate 5 with a ring-plate 8, the outer side of which latter fits closely against the inner or adjacent side of flange or collar n on sleeve N, and the inner edge or surface of which fits the plain or smooth portion 71 of said sleeve, as shown. Screwing upon the externally-threaded portion 11 of the sleeve N is a nut 10 for confining the ring-plate 8 snugly in place between the outer face of said nut and the inner or adjacent face of the flange or collar 12, and also screwing upon said externally-threaded portion n and adjacent the inner face of said nut 10 is a jam-nut 11, secured to sleeve N by means of a pin 12 or other means, so as to prevent both of said nuts from turning relatively to said sleeve. By tightening up the set-screws n hereinbefore referred to, so as to cause the inner ends thereof to bear against the outer face of said ring-plate, it is apparent that the said sleeve N will be prevented from turning relatively to or upon the threaded section of the rod or shaft D. As an additional means for preventing said sleeve from so turning I also employ a looking device of any desired form and consisting, preferably,in the present instance of an arm 15, located within the recessed outer face of valve-head C (see Fig. 1) and formed with an inner member 16, having a lug 17, which engages in the notches or serrations n in the edge of flange or collar 92?, and the outer end of said arm is formed or provided with a member 18, having an opening through which passes a threaded stud 19, which screws into a threaded opening or recess therefor provided in the outer face of the disk or plate 5 of valve-head O, as shown. Screwing upon the outer end of said stud is a nut 20, which is prevented from turning preferably by means of a split pin 21, passing through an opening therefor in the stud.

The numeral 25 designates a circular plate or washer having a squared central opening 26 to fit upon the squared portion d of rod or shaft D, and this plate or washer is clamped against the adjacent portions of the outer surface of flange or collar n of sleeve N by means of screws 27, passing through preferably diametrically opposite openings therefor in said flange or collar, the headsof said screws overlapping said plate or washer at the edges, as clearly shown in Fig. 3. In this instance also I preferably employ an additional locking device, consisting of a plate 28, secured to the outer face of flange or collar n by means of a stud 29 and nut 30, said plate having a lug 31 taking into or engaging notches or serrations 31, formed in said plate or washer 25, preferably all around at the edge, so as to enable any desired adjustment of shaft D to be made in the manner appearing hereinafter.

As regards each of the special or additional locking devices herein referred to, it will be understood that I am not limited thereto in their precise details, since departures therefrom may be made and still come Within the scope of my invention. It will also be understood that the notches n in flange or collar n may also be formed all around the edge of the latter, if desired.

The circular disk or plate 5 of valve-head O is reduced in thickness or beveled at the edge, as shown at 5, and said disk or plate is provided, preferably at opposite diametric points, with flush portions 56, formed with smooth-bored openings, through which pass studs or bolts 35, threadeda suitable distance from their inner ends at 36 to enter threaded openings therefor in projecting portions 37 at corresponding positions on the outer surface of the enlarged or flaring end a, of the body A of the structure, the studs or bolts being also threaded at 38 for a suitable distance from the outer ends thereof to receive the fastening-nuts 39, which are secured in place by means of split pins 40, forinstance, passing through suitable transverse openings in the said studs or bolts. The studs or bolts 35 also pass through corresponding smoothbored openings formed in a disk 41, having formed therewith a cone 45, which cooperates with the expansible ring G, the inner surface 46 of which is tapered or conical in correspondence with the outersurface of said cone, as shown, the outer surface of said ring constituting one of the workingfaces of the valve structure, as alreadyexplained, and said disk and cone in part constituting the adjusting or expanding device F for this expansiblering, which latter is split at 47, as shown in dotted lines in Fig. 3, and confined between face I) of the end ct of the body A of the valve and the inner face of the valve-head C. The said disk 41 is formed with an. enlarged central opening 48, and connecting with the disk is an inwardly-extending spider 49, the inner extremity of which is provided with a ring 50, which is screw-threaded interiorly at 51 to fit and work upon the externally-threaded portion a of the sleeve N.

It is to be understood that as thus constructed and organized the several cooperative elements at each end of the valve or similar structure are tightened in place by screwing up the nuts on the outer ends of the studs or bolts which secure the valve-heads to the end portions of the body of the valve, the inner ends of said bolts being riveted or upset, as shown, to prevent the latter from working loose or pulling out. Now should it be desired, for instance, to move the adjusting device E outwardly, by which to adjust or expand the ring G to take up or compensate for wear occurring at the outer face of said ring, the screws 27 are loosened, so as to disengage the plate or washer 25 from the flange or collar 01 of ring N, whereupon the plate 28 is detached from said flange or collar, thus releasing the lug 31 from the notch 31 engaged thereby, and then by applying a suitable wrench to the squared portion (1 of rod or shaft D the latter may be turned, and in virtue of the threaded connection between this rod or shaft and the sleeve N the said rod or shaft will be caused to move longitudinally, and thereby operate upon the expanding device E in an obvious manner and causing the latter to move, so as to adjust or expand the said ring G. After this the parts are again tightened up,as bef0re,and it will be apparent that in conducting these operations the sleeve N is prevented from rotating or moving in either direction lengthwise of the rod or shaft D by reason of the described locked relation existing between the said sleeve and the valve-head 0. Hence the adjusting device F for the expansible packing-ring G remains unaffected. Whenever it is desired to operate the said adjusting or expanding device F to expand the packing-ring G, the set-screws n are loosened and the additional locking device or arm 15 is detached by removing stud 19 and disengaging the lug 17 from the notched edge of flange or collar n whereupon by turning the sleeve N in the proper direction the said adjusting or expanding device will be moved outwardly in virtue of the threaded connection between the inner surface of ring and the external surface of a portion of said sleeve, as already explained. During these operations the said packing-ring G will be expanded in an obvious manner, and the opposite adjusting or expanding device E will remain unafiected thereby.

In order toprevent leakage of steam or other motor fluid into the valve structure through the space or split formed between the ends of each of the expansible packingrings G and G, and which is undesirable for several reasons, I preferably notch each end of each of said rings at the sides thereof, as

indicated at in Fig. 6, so as to reduce the width of said rings at the ends for a suitable distance, as shown, and to each side of one of the reduced ends of each of said rings I attach, by means of rivets 61, a strip 62, the upper edge of which is curved in conformity with the curved outer surface of the ring, the ends of said strips being also curved at 63 to fit against the corresponding curved walls 6i of the notches 60. In this way a movable connection may be said to be formed between the ends of each of the expansible packing rings, and seated inrecesses 65 therefor in the outer face of each of the cones of the expanding devices E'and F is a block or plate 66, which is flush with said cone-face, said blocks being of width greater than the depth of said cones and each block extending the full distance between the inner face of one of the valve-heads and the adjacent edge of the end portion of the valve-body. By the construction and organization of elements referred to no steam or other fluid can possibly pass into the interior of the valve at whatever distance apart the ends of the packing-rings may be separated, and which feature is a very important one in this class of inventions.

As before stated, I do not wish to be understood as limiting myself to the precise details of construction and organization of elements herein illustrated and referred to. 7

Having described my invention, I claim 1. A piston-valveor similar structure comprising a body, a packing and an expanding device therefor at each end of the body, and means for effecting the independent adjustment of each of said devices from the same end of the body.

2. A piston-valve or similar structure comprising a body, a split packing-ring and an expanding device therefor at each end of the body, and means foreifecting theindependent adjustment of each of said devices from the same end of the body.

3. A piston-valve or similar structure comprisinga body, a packing and an expanding- IIO cone therefor at each end of the body,and

means for efiecting the independent adj nstment of each of said cones from the same end of the body.

4. A piston-valve or similar structure comprising a body, a split packing-ring and an expanding-cone therefor at each end of the body, and means for efiecting the independent adjustment of each of the cones from the same end of the body.

5. A piston-valve or similar structure comprising a body, a packing and an expanding device therefor at each end of the body, devices for efiecting the independent adjustment of each of said expanding devices from the same end of the body, and means for locking each of said adjusting devices in different positions.

6. A piston-valve or similar structure comprising a body, a packing and an expanding device therefor at each end of the body, devices for effecting the independent adjustment of each of the expanding devices from the same end of the body, and means located at one end of the body for locking each of said adjusting devices in different positions.

7. A piston-valve or similar structure comprising a body, a split packing-ring and an expanding-cone therefor at each end of the body, devices for effecting the independent adjustment of each of said cones from the same end of the body, and means located at this end of the body for locking each of said adjusting devices in different positions.

8. A piston-valve or similar structure comprising a body, a packing and an expanding device therefor at each end of the body, devices for effecting the independent adjustment of each of said expanding devices, and means located at the same end of the body for locking each of said adjusting devices in different positions.

9. A piston-valve or similar structure comprising a body, a split packing-ring and an expanding device therefor at each end of the body, and means for effecting the independent adjustment of each of said devices from the same end of the body, said packing-ring having a movable steam-tight joint at the split portions thereof.

10. A piston-valve or similar structure comprising a body, a split packing-ring and an expanding-cone therefor at each end of the body, and means for elfecting the independ ent adjustment of each of said devices from the same end of the body, said packing-ring havingamovablesteam-tightjointat thesplit portions thereof.

11. Apiston-valveorsimilarstructurecomprising a body, ahead and an expansible packing-ring at each end of the body, said rings having inner conical surfaces, a device including a cone for expanding each of said rings, and means located at the same valvehead for locking each of said devices in different positions of adjustment.

12. A piston-valve or similar structure comprising a body, a head and a split packingring at each end of the body, said rings having inner conical surfaces, devices including a cone for expanding each of said rings, and means located at the same valve-head for locking each of said devices in different positions of adjustment.

13. Apiston-valveorsiniilarstructurecomprising a body, a head and a split packingring at each end of the body, and devices including a cone for expanding each of the rings, said rings being each reduced in width at the ends and provided with overlapping strips, and said cones being recessed and provided with blocks extending between the valve-heads and ends of the body beneath said strips.

14. Apiston-valveorsimilarstructure comprising a body enlarged at the ends thereof,

a head and a split packing-ring at each of such ends, and devices includingacone for expanding each of the rings, said rings being each reduced in width at the ends and provided with overlapping strips, and said cones being recessed and provided with blocks extending'between the valve-heads and ends of the body beneath said strips.

15. Apiston-valveorsimilarstrncturecomprising a hollow body enlarged or flaring at the ends, a head and a split packing-ring at each of such ends, and means including a cone for expanding each of the rings, said rings being each reduced in wid that the ends thereof and provided with overlapping strips, and said cone being recessed and provided with blocks extending between the valveheads and endsofthe body beneath said strips.

16. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of the body, an expanding device for each ring, and a rotatable rod or shaft connecting said devices and adapted to be moved longitudinally to operate one of them independently of the other.

17. A piston-valve or similar structure comprising a hollow body, a head and an expansible ring at each end of the body, a valve or similar rod connected to one of the heads, an expanding device for each ring, and a rotatable rod or shaft connecting the said devices and adapted to be moved longitudinally to operate one of them independently of the other.

18. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of said body, an expanding device for each ring, a rotatable rod connecting said devices and adapted to be moved longitudinally to operate one of them independently of the other, and means for locking each of said devices in different positions of adjustment.

19. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of said body, an expanding device for each ring, a rotatable rod connecting said devices and adapted to be moved longitudinally to operate one of them, and means located at one of the valveheads for locking each of said devices in different positions of adjustment.

20. Apiston-valveorsimilarstrncturecomprising a hollow body, a head and an expansible packing-ring at each end of the body, a cone for expanding each ring, and a rotatable rod connecting said cones and adapted to be moved longitudinally to operate one of them independently of the other.

21. Apiston-valveorsiinilarstructm'e comprising a hollow body, a head and an expansible packing-ring at each end of the body, a valve or similar rod connected to one of the heads, a cone for expanding each ring, and a rotatable rod connecting said cones and adapted to be moved longitudinally to operate one of them.

22. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of said body, a cone for expanding each ring, a rotatable rod connecting said cones and adapted to be moved longitudinally to operate one of them, and means for locking each of said cones in difierent positions of adjustment.

23. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of said body, a cone for expanding each ring, a rotatable rod connecting said cones and adapted to be moved longitudinally to operate one of them, and means located at the same valve-head for locking each of said cones in different positions of adjustment.

24. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of the body, a cone for expanding each ring, one of said cones being provided with a spider having a ring, and a rotatable longitudinally-movable rod connecting said cones, one end of said rod working in the ring and provided with collars at the opposite edges of said ring.

25. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of the body, a valve or similar rod connected to one of the heads, a cone for expanding each ring, one of said cones being provided with a spider having a ring, and a rotatable longitudinallymovable rod connecting said cones, one end of said rod working in the ring and provided with collars at the opposite edges of said ring.

26. Apiston-valveorsimilarstrncturecomprising a hollow body, a head and an expansible packing-ring at each end of the body, a cone for expanding each ring, one of said cones being provided with a spider having a ring, and a rotatable longitudinally-movable rod connecting said cones, one end of said rod working in the ring and provided with collars at the opposite edges of said ring, and means for locking each of said cones in different positions of adjustment.

27. Apiston-valveorsimilarstructurecomprising a hollow body, a head and an expansible packing-ring at each end of the body, a cone for expanding each ring, one of said cones being provided with a spider having a ring, and a rotatable longitudinally-movable rod connecting said cones, one end of said rod working in the ring and provided with collars at the opposite edges of said ring, and means located at the same valve-head for locking each of said cones in different positions of adjustment. I

28. Apiston-valveorsimilarstructure comprising a body, and a head and an expansible packing-ring at each end of the body, a rotatable rod within the body having collars at one end thereof and provided with a threaded section at the other end, an expanding device for one packing-ring formed with a part fitting between said collars, a sleeve internally threaded to turn on said threaded section of the rod, said sleeve being also threaded externally, an expanding device for the other packing-ring having a threaded part working on said sleeve, and means for locking each of said expanding devices in different positions ofadjustment.

29. A pistonvalve or similar structure comprising a body, and a head and an expansible packing-ring at each end of the body, a rotatable rod within the body having collars at one end thereof and provided with a threaded section at the other end, an expanding-cone for one packing-ring having a ring fitting between said collars, a sleeve internally threaded to turn on said threaded section of the rod, said sleeve being also threaded externally, an expanding-cone for the other packing-ring having a threaded ring Working on said sleeve, and means for locking each of said expanding-cones in different positions of adjustment.

30. Apiston-valveorsimilarstructurecomprising a body, and ahead and an expansible packing-ring at each end of the body, one of said heads having a valve or similar rod connected thereto, a rotatable rod within the body having collars at one end thereof and provided with a threaded section at the other end, an expanding device for one packingring having a ring fitting between said collars, a sleeve internally threaded to turn on said threaded section of the rod, said sleeve being also threaded externally, an expanding device for the other packing-ring having a threaded ring working on said sleeve, and means for locking each of said expanding devices in different positions of adjustment.

31. Apiston-valveorsimilarstructnrecomprising a hollow body enlarged at the ends, and a head and an expansible packing-ring at each of such ends, a rotatable rod within the body having collars at one end thereof and provided with a threaded section at the other end, an expanding device for one packing-ring having a ring portion fitting between said collars, a sleeve internally threaded to turn on said threaded section of the rod, said sleeve being also threaded externally, an expanding device for the other packing-ring havinga threaded ring workingon said sleeve, and means for locking each of said expanding devices in different positions of adjustment.

32. Apiston-valve orsimilarstructure comprising a hollow body enlarged or flaring at the ends, and a head and an expansible packing-ring at each of such ends, a rotatable rod within the body having collars at one end thereof and provided with a threaded section at the other end,-an expanding-cone for one packing-ring formed with a ring portion fitting between said collars, a sleeve internally threaded to turn on said threaded section of the rod, said sleeve being also threaded externally, an expanding-cone for the other packing-ring having a threaded ring working on said sleeve, and means for locking each of said expanding-cones in different positions of adjustment.

A piston-valve or similar structu rc comprising a body, and a head and an expansible packing-ring at each end of the body, a rotatable rod within the body formed at one end.

with a threaded section and squared to receive a wrench, an expanding device for one packing-ringhaving movable connection with the other end of the rod, a threaded sleeve working on said threaded section of the rod, said sleeve being also threaded externally a distance from its inner end, and provided at its outer end with a flange or collar lying against the outer face of the valve-head at that end, said flange or collar being formed with openings having set-screws, and also having notches at the edge thereof, lock'nuts on the sleeve at the innerface of said valve-head, a plate or washer having notches at the edge and fitting the squared portion of the rod against the outer face of said flange or collar, screws entering openings in the latter and having heads overlapping the edges of said plate or washer, an expanding device for the other packing-ring having a threaded ring working on said sleeve, and a locking device for each of said expanding devices having means engaging the notches of said flange or collar and said washer respectively.

34. A piston-valve having at each end a packing, and also having at one end means for effecting separate adjustment of either packing at will; in combination with a valve-operating rod projecting from the other end of the Valve.

35. A piston-valve having at each end a packing, means at one end of the valve for adjusting at will the packing at said end, and means, including an independently-movable part extending through said adjusting means, for adjusting at will the packing at the other end of said valve.

36. In a piston-valve, the combination with a plurality of packings, one at each end of the valve, and means for confining the edges of said packings, of an adjusting member for one of said packings, including an adjustable part which extends beyond the other packing.

87. In a piston, the combination with a plurality of packings, one at each end of the piston, of two independently-revoluble members one within the other, means controlled by one of said revoluble members for expanding one of said packings, and means controlled by the other of said revoluble members for expanding the other of said packings.

38. In a piston, the combination with a plurality of packings, one at each end of the piston, of two independently-revoluble members one within the other, means controlled by one of said revoluble members for expanding one of said packings, means controlled by the other of said revoluble membersfor expanding the other of said packings, and means for securing at will said revoluble members so that they may revolve together.

39. In a piston, the combination with a plurality of packings, one at each end of the piston, of two independently-rem]uble members one within the other, means controlled by one of said revoluble members for expanding one of said packings, means controlled by the other of said revoluble members for expanding the other of said packings, means for securing at will said revoluble members so that they may revolve together, means for securing at will'one of said revoluble members so that they may revolve together, and means for securing at will one of said revoluble members to a fixed part of the piston, so as to prevent its movement while the other of said revoluble members is being adjusted.

40. In a piston, the combination with packings at the ends of the piston, of a revoluble member, means controlled thereby for expanding one of said packings, a second revoluble member having a threaded engagement within the first revoluble member, and means controlled by said second revoluble member for expanding the other of said packings.

41. In a piston, the combination with packings at the ends of the piston, of a head at one end of the piston, a revoluble member mounted in said head, a member having a threaded connection with said revoluble member and also having means for expanding one of said packings, a second revoluble member within the first revoluble member and having a threaded engagement therewith, and means controlled by said second revoluble member for expanding another of said packings.

4-2. In a piston, the combination with a plurality of packings, of adjustable means independently connected to each of said packings for expanding either of said packings at will independently of the remaining packing or packings.

43. In a piston-valve, the combination witlf packings at the ends of the valve, of independently-operable members movable longitudinally of the valve and provided with means for adjusting said packings, a central rod having a pivotal engagement with one of said longitudinally movable members, a sleeve threaded upon said rod, means for coupling said sleeve to a fixed part of the valve at will so that the rod may when rotated move longitudinally within the sleeve, a threaded portion upon said sleeve which engages a threaded portion upon the other of said longitudinally-moving members, and means for coupling together at will said sleeve and said central rod, so as to prevent relative endwise movement between them during the adjustment of the last-mentioned longitudinallymovable member.

44. In a piston, the combination with packingrings, of cones within said rings, and means for effecting movement longitudinally of the piston of either of the cones at will independently of the other thereof.

45. In a piston-valve, the combination with packing-rings, of cones within said rings, and means effecting movement longitudinally of the valve of either of the cones at will independently of the other thereof, said moving means including parts extending to the same end of the valve.

46. In a piston-valve, the combination with a body, of packings at the ends of said body, heads between which and the body the packings are clamped, cones within the packings, and devices for adjusting either cone at will independently of the other.

47. In a piston-valve, the combination with a body, of packings at the ends of said body, heads between which and the body the packings are clamped, cones within the packings, devices for adjusting either cone at will independently of the other, and a valve-operating rod projecting from one of said heads, one of said adjusting devices extending through the body to the other of said heads.

48. In a piston-valve, the combination with a body, of packings at the ends of said body, heads between which and the body the packings are clamped, cones within the packings, a screw-threaded device for adjusting one of said cones, means for clamping said screwthroaded device, an independently-operable threaded device for adjusting the other of said cones, and means for clamping the lastmentioned screw-threaded device.

49. In a piston-valve, the combination with a body, of packings at the ends of said body, heads between which and the body the packings. areclamped, cones Within the packings, a screw-threaded device for adjusting one of said cones, means for clamping said screwthreaded device, an independently-operable threaded device for adjusting the other of said cones, and means for clamping the lastmentioned screw-threaded device; one of'said screw-threaded devices extending to the end of the piston at which the other of said screwthreaded devices is mounted, and having at said end a part adapted for operation by a suitable tool.

CLIFTON REEVES.

Witnesses:

LIN'roN SATTERTHNVAIT, EDWARD 0. Lone.

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