US323404A - Valve - Google Patents

Description

(No Model.)

W. F. DURPEB.

VALVE.

Patented Aug. 4, 1885 iff/esse;

N Pneus. Pmwmmmmr. Wmme". me.

IINTTED STATES PATENT @Erica IVILLIAM I?. DURFEE, OF BRIDGEPORT, CONNECTICUT.

VALVE.v

SPECIFICATION forming part of Letters Patent No. 323,404, dated August 4,1885.

' Applicaticn tiled March 28, 18S-l. (No model.)

To all :whom t may concern.-

Be it known that l, WILLIAM F. DUREEE, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State oi' Connecticut, have invented certain new and useful Improvements in Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the same.

My invention relates to that class of valves which are especially adapted for use in connection with hydraulic cranes, presses, 85e., and has for its object to produce a perfectly-balanced sliding valve which shall be simple in construction, easy to operate, and which will not leak. lVith these ends in view I have devised the novel construction which I will proceed to describe, referring by letters to the accompanying drawings, forming part of this specification, in which- Figure l is an elevation of the device coniplcte; Fig. 2, a transverse section on the line xx, Fig. l; Fig. 3, a longitudinal section, with the rack and lever in elevation; and Fig. 4, a view illustrating a modified form of operating mechanism.

Similar letters indicate the same parts in all the figures.

A, A', r A3, and AL represent a series of castings, which are held in position by four longitudinal bolts, B.

Il is a flange cast with or secured to casting A2, by means of which the valve is held in place by bolts or in any suitable manner. A central longitudinal opening extends through all of these castings, which, in castings A, A2, and A, is sul'licien tl y enlarged to form circular chambers c, ai, and ci, which may be termed, respectively, discharge inductiom and circulating chambers. Gastin gs A, A2, and

A are provided at both ends and castings- A and A* at their inner ends with concentric recesses I) I). At the inner edges of these recesses the metal is smoothed awa-y, leaving rounded corners b ZJ.

C C are metallic disks, preferably of brass, which also have central openings. These disks are thickest at their central openings, the metal being curved down to a feather edge, c, on both sides of the central disks and on the inner sides of the two enddisks. The

disks are circular in forni, and are the exact diameter of the recesses in the ends of the castings, so that in assembling the castings are centered by the disks.

Between the disks and the castings I place cup-leathers D D, which are closely held bctween the curved surfaces of the disks and the rounded corners of the castings.

E is a tube or cylinder closed at its ends and having circumferential perforations c at two points in its length. This cylinder closely lits the two end castings and the metallic disks, and is adapted to have reciprocatory movenient therein.

F is the induction-pipe,which communicates with chamber c2,- G, the eduction-pi pe, which is connected with chamber c,- and H, the circulating-pipe, which leads from chamber a to the jack or other apparatus to which it is desired to convey water.

K is a bar which slides in a way or groove, K, in casting A. This bar is provided upon one side with stops K", which engage the beads of setserews Kt, projecting from casting A, to limit the movement of the bar, as shown in Fig. 3. On a portion of its length the bar is provided with rack-teeth Ki'.

L is a lever pivoted in bearings L', which project upward from the casting A. At the teeth L3, which engage with raclcteeth K2 upon the bar to operate the saine.

The tube or cylinder E extends through the central openings in the series of castings and and in the two end casti ugs, A and A", which are the bearings in which it reciprocates.

W'hen the parts are assembled, the cupleathers are held between the castings and the disks, and are pressed against the cylinder, thus preventing any appreciable leakage .or escape of water from one chamber to an other. Should slight leakage occur outward from chambers a or c", by means of water passing between the cup fleather and disk and the tube, this leakage will collect in small chambers M in castings A and A", from which wastepipes h' lead. These pipes are Kconnected with the ednction-pipe G, so that escape of water outside of the valve is practically iinpossible. As an additional precaution against leakage, it will be noticed that the cup-leathlower end oi' the lever is a sector, L2, having the disks G C, litting closely in all of the disks 1 ICO ers on each side of the disks are of sufficient length to bear for a short distance upon the tube, the ends of said cup-leathers extending outward into the chambers from the point at which they are held between the-feather edges of the disks and the rounded corners of the castings, so that the pressure of the water in the chambers is upon the outer surface of the cup-leathers. The greater the pressure of water, therefore, in any of the chambers, the closer the cup-leathers will bind the tube and the less willbe the possibility ot' any water escapi ng.

N N are upright supports, into which the ends of the tube are screwed, and which rigidly connect the same with bar K by means of bolts N 2, or in any suitable manner.

N N are gaskets against which the ends of the tube bear to secure water-tight joints.

,The operation is as follows: The water enters chamber at all times through pipe F. Vhen the valve is open, as shown in the drawings, the water passes from-chamber a2 through the right-hand series of perforations cinto tube E. The water escapes from the tube through the left-hand series of perforatious into chamber a, and from thence it passes into pipe H, which leads tothe jack or other apparatus which it is desired to operate. To stop the iiow of water, lever L is lifted to a vertical position. As the lever is lifted the teeth upon the sector engage with those upon bar K, moving the bar, and with it the tube, toward the right. XVhen the lever is in a vertical position, the tube will have been car-` ried toward the right su'fiicient distance to bring' the right-hand series of perforations in contact with the inner face of the disk between chambers at and a3. In practice I usually make the perfor-ations in two rows extending entirely around the tube. The number and arrangement of these perforations or orifices, however, is a matter of no consequence, except to this extent, that the right-hand series must be within a space longitudinally of the cylinder, which is less than the bearingi'ace ot' the disk between chambers e? and a, so that the perforations may all be covered thereby. Vhen the parts are in -the position just described, no water can pass from the valve into pipe H, nor can any water pass from said pipe into the valve. In use the tube and f chamber a are always filled with water, said chamber being made sufficiently long so that at neither extremity of the motion of the tube can the left-hand'series of perforations pass outside of it. be received from pipe H at any time, the direction of the flow depending upon the position of the right-hand series of perforations relatively to chambers at and a. When lever L is in the vertical position just referred to, there can be no circulation of water. The

jack or other apparatus will consequently be held stationary, the parts remaining in the exact position they occupied when the ilow of water into pipe I-I was cut off.

'Io reverse Vater may thus pass into orthe-flow of water, lever L is moved over to the left to about the corresponding angle of inclination to that shown in Figs. 2 and 3-that is to say, the lever will then stand at the same angle relatively to aperpendicular line drawn through its axis, as is shown in Figs. 2 and 3, but will be at theleft of saidline, instead of at the right, as shown. This movement,by means of the sector and rack, carries the tube to the right, bringing the right-hand series of perforations into chamber a, into which the water in the tube and pipe H flows, then out through eduction-pipe G.

It will be observed that by my improved constructionlsecure aperfect balance of pressure, no matter what may be the position of the tube relatively to the induction, eduction, or circulating chambers; also, that the movement of the parts is positive and the action instantaneous.

It will of course be obvious that the details of construction may be varied considerably without departing from the spirit of my invention, the gist of which consists in the use of a sliding tube havingtwo sets of perforatious, one of which remains constantly within the limits ofthe circulating-chamber, the other set being adapted to be moved into the induction or the eduction chambers or placed contiguous to the inner face of the metallic disk which separates said chambers.

rlhe operating mechanism shown is not an essential feature of my invention, but will be found preferable for many uses. Instead of the sector and rack, however, movement may readily be imparted to tube E by means of a quick-acting screw having bearing in a separate casting; or, as shown in Fig. 4, casting A4 may be prolonged into an outwardly-curved arm, A5, to which the lever may be pivoted. In this construction no rack and sector are used, and instead of being screwed into a support, N, the tube is provided with a slotted head, N3, within which the lever is pivoted, the end of the lever being also slotted, as shown, to permit free movement on the pivot.

Having thus described my invention, I claiml. In a valve, the combination of a plurality of annular sections,A A2 A3, the ducts F G H, a sliding tube of less diameter than the interior of said sections and having the apertures e, and the disks G and their packings clamped between the ends of said sections and forming bearings for the sliding tube, and partitions for dividing the annular space between the tube and said sections into chambers, substantially as set forth.

2. In a valve,v the combination of a watertight casing having ducts communicating therewith, a tube adapted to slide therein and place the desired ducts in communication with one another, said tube being connected with a parallel bar, also adapted to slide in the casing, whereby the alignment of the tube is maintained, substantially as set forth.

3. In a valve, the combination of a water- ICO tight casing having ducts communicating therewith, and a tube adapted to slide therein and place the desired ducts in communication with one another, said tube being connected with a parallel bar, also adapted to slide in the casing, the bar being provided with a rack, and the casing with a lever and segment for actuating the rack and tube, substantially as set forth.

4. In a valve, the combination ofa plurality of annular sections, A A2 Ai, the ducts F G H, a sliding` tube of less diameter than the interior of said sections and having the apertures e, and the disks C and their paekiugs clamped between the ends of said sections and forming bearings for thesliding tube, and partitions for dividing the annular space between the tube and said sections into chambers, said sections having in their ends the recesses b, adapted to receive and t the disks C, thereby centering the sections, substantially as set forth.

- 5. The casting A, having a groove, K', andA

Images