US1306156A - Valve - Google Patents

Description

W. A. MURRAY AND C. PUTNAM.

VALVE.

APPLICATION FILED IULY I, 1918 Patented June 10, 1919.

2 SHEETS-SHEET I.

w. A. MURRAY AND c. E. PUTNAM.

VALVE.

APPLICATION FILED lULY I, I9I8-- ,305", 1 56 Patented June 10, 1919.

2 SHEETS-SHEET 2.

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WILLIAM A. MURRAY AND CHARLES E. PUTNAM, 0 F CHISI-IOLM, MAINE.

VALVE.

, Specification of Letters Patent.

Patented June 10, 1919.

Application filed July 1, 1918. Serial No. 242,829.

the opposite ends of a piston cylinder forthe reciprocating suction boxes of a Fourdrinier paper making machine, such, for instance, as that shown in my pending application, Serial No. 234,544, filed May 13, 1918.

It,is a more particular object of the invention to provide a valve mechanism which will be instantaneous in its action, and is therefore particularly adapted for use in connection with pistons having a relatively short reciprocating stroke, said mechanism including a pressure controlled cut-off valve operable to alternately admit the pressure guid to the opposite ends of the piston cylin- It is also another detail object of our invention to provide improved means automatically actuated by the reciprocating piston, at the end of each stroke thereof, to eflect the actuation of the cut-off valveby the pressure fluid and shift said valve to a position to admit the pressure fluid to the rela tively opposite ends of the piston cylinder.

And it is also a further general object of the invention to provide a valve mechanism as above characterized, which will be positive and reliable in its action, and which consists of relatively few, simply constructed parts, not liable to get out of order, and capable of manufacture at comparatively small cost.

With the above and other objects in view, the invention consists in the improved con struction, combination and relative arrangement of the several parts as will be hereinafter more fully described, subsequently claimed and illustrated in the accompanying drawings in which similar reference characters designate corresponding parts throughout the several views, and wherein Figure 1 is a vertical sectional view through a piston and its cylinder, showing the latter equipped with our improved valve;

Fig. 2 is a top plan view;

Fig. 3 is a section taken on the line 33 of Fig. 2;

Fig. 4-is a bottom plan view of the easing for the piston actuated valve;

Fig. 5 is a similar view of the fluid admission head; and

Fig. 6 is an end elevation of the piston actuated valve.

Referring in detail to the drawings, 5 designates the body of the piston cylinder, to the opposite ends of which the heads 6 are securely fixed by means of the screws or bolts 7. One of these heads is provided with a stuffing box for the piston rod 8, upon the end of which the piston 9 of any suitable construction is securely fixed to reciprocate within said cylinder. The body wall 5 of the cylinder is provided, preferably at the top thereof and at its opposite ends, with the fluid inlet ports 10 and at the bottom of the cylinder and at each of its ends, pet cocks 11 are provided.

The piston 9 may be actuated by water, steam or other suitable pressure fluid,'which is admitted to the cylinder through a supply head 12, which is securely fixed upon the top of the cylinder wall 5. This supply head is formed with an elongated base porpressure fluid is admitted to said bore through a passage 16 extending at right angles thereto and communicating with the 95 bore at its center. The fluid is supplied to said passage through a pipe, indicated at 17, suitably connected to the head 12 and extending from'the supply source.

In the bottom face of the base portion 13 of the supply head, the non-communicating, longitudinally extending channels 15} are formed, said channels at their inner ends being curved in relatively opposite directions and communicating with the transversely spaced ports or openings 19, formed through said base portion of the supply head at the center thereof. These ports open into the bore 14 adjacent the opposite ends thereof. The supply head 12 is further formed with a passage 20 communicat ing witli the upper side of the bore 14 at its center and opening upon the upper face or said head. Additional ports or openings 21 are formed through the" supply head and also open upon the upper face thereof, said ports communicating with the bore 14 at lts opposite ends. A pressure controlled cut-oil valve' 22 is arranged in the bore 14 for free sliding or reciprocating movement and controls the passage of the pressure fluid through the various ports or passages ofthe supply head, in a manner whlch w ll be hereinafter clearly explained. The lntermediate portion of this? cut-oil valve is reduced in diameter to provide a continuous annular, longitudinally extending chamber 23 within the bore 14. Upon the supply head 1 25 a valve casing 24 is mounted, the axis of the valve casing: extending longitudinally of the piston cylinder. This casing is likewise formed witlr an elongated base 25 disposed transversely of the piston cylinder and suitably secured. upon the upper surface of the-head 12. An opening 26, centrally, formedthrough the base 25,- is disposed: inregistering relation with the openingor passage 20in the supply head, said opening 26 communicating with: the boreof, the valvecasing. The base plate 25 is likewise formed in its bottom fiace With the non-communicating, longitudinally extending passages 27, the inner ends of which are carved in relatively opposite directions and communicate: with the transversely spaced ports 28 extending through said base plate and communicating. with the casing; bore.

ylind'rical slide valve 29 i's arranged in the casing 24:,- said valve having an axially extending bore 30 and the medial portion thereof beingeXtern-ally reduced in diameter to providetheannular chamber 31; A rod 32 is detachably threaded in one end of the bore 30 and extends through a suitable stuflingl box 33' on one end of the valve casing 24-. The other end of the valve casing is provided with a coupling-nipple, indicated at 35', to: which a Waste outlet pipe 36' is adapted to be connected. At the end of the slide valve,to which the rod 32 is connected, the. wall of said valve is provided with a plurality of spaced, obliquely inclined ducts 37, opening upon the end? face of said valve and communicating with the bore thereof;

- These ducts. permit of the free passage of the water or' other pressure fluid through the bore 30 to the waste pipe in the movement of the valve in; one direction and effectually overcome the possibility ot a cushion being formed behind the valve member;

The upper end of an arm 38 is loosely engaged upon the valve rod 32, said rod at its lower end. being securely fixed upon the piston rod 8; The upper end of the arm is movable upon the valve rod between i e site ends of the piston cylinders.

the passages 27 in the base plate of the valve casing 24L communicate with; the: respective ports or openings 21 in the supply head- Having now described the construction and: arrangement of the various elements-,, the op: creation of our invention will beunderstood as follows:

Assuming that the parts are; therelative.

positions seen in Figs. 1; and?) or the draW- ings, and the pressure. fluid is being ad mitted through the supply head to the right hand end of the pistoncylinder; said fluid acting against the piston drives the same to the opposite-0r left hand end ofthe cylinder. 'When thefpistonreaches the limit: of its strokeinthis direction, the: arm 38 will engage the inner collar 39 on the rod and thereby force the valve member 29 to the left so as to close the right hand port 28 and open,communication between the' left hand port 28 and the annular chamber 3 1 of the. valve. member; The pressure fluid [7 flowing ulpwardly, through the; passages 20 and 26- Willthus be admitted tl'irough one of the passages 27 to one end ofthe here 14 and: acting against the cutpfi'valve- 22 will shift said valve so through which the pressure fluid is being admitted to the right hand end ofthe cyl' inder and: open the other port 19, whereby thepressure fluid may flow troin chamber 23 into the left hand end of the piston cylinder and acting against the piston reverse its reciprocating movement. When the piston reaches the limit oil its movement in this direction, the arm 38' will strike the outer collar 39 and shift the slide valve 29 to the right, thereby again 1"e\'*ersing the new of thepressure fluid through the valve casing and the supply head 1-2: The fluid after having expended its force or pressurea-gai'nst the piston, finds an outlet through the pet cocks 1-1 when the movementof the piston is reversed. Thus, it will be seen that we have provided a very simple and at the same time positive midr'eliable valve mechanism which is automatically controlled in the re: clprocating movements" of the piston to n ternately achnit the pressure fluid, to o po: As this valve mechanism is very quick in its action; it will be appreciated that ticularly advantageous for use inconnection as-to' close the port 19' I the device is parwith" pistons having a relatively short is 5 ciprocating stroke; We have herein referred to such a piston employed for actuating the suction boxes of a F ourdrinier machine, but it is of course manifest that the present invention is not limited in its utility to such application, as it may likewise be adapted to use in connection with various other machines.

From the foregoing description, taken in connection with the accompanying drawings, the construction, manner of operation and several advantages of the invention will be clearly and fully understood. The several parts of the device are compactly arranged and assembled upon the piston cylinder, and owing to the simple construction thereof will require but little care or attention upon the part of the operator. It will be understood, of course, that the relative.

dimensions of the various elements and the fluid ports or passages will be determined in accordance with the dimensions of the piston cylinder and the pressure sustaining area of the piston, whereby the fluid in requisite volume will be admitted to the ends of the cylinder.

While, therefore, We have shown and described what We have found to be one practical embodiment of our invention, it is to be understood that the device is susceptible of considerable modification therein, and we accordingly reserve the privilege of adopting all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

We claim 1. In combination with a cylinder and piston reciprocating therein, means for alternately supplying a pressure fluid to the opposite ends of the cylinder including a slide valve, a casing for said valve provided with an exhaust, said valve being provided with a bore in communication at opposite ends with the interior of the casing, and means carried by the piston to automatically actuate said valve at each end of the piston stroke.

2. In combination with a cylinder and piston reciprocating therein, a pressure fluid supply head mounted upon the cylinder and having ports for the admission of pressure fluid to the opposite ends of the cylinder, said head being further provided with a pressure fluid supply passage, a pressure actuated slide valve mounted in the head and controlling the flow of the pressure fluid from said passage to the respective ports, a valve casing secured upon the supply head, said head and the casing having communicating ports for the admission of the pres sure fluid to the opposite ends of the slide valve and being also provided with additional ports communicating with the supply passage, said casing being provided with an exhaust and a valve in said casing automatically actuated in the reciprocation of the piston to admit the pressure fluid to the opposite ends of the slide valve and shift said valve to alternately supply the pressure fluid to the opposite ends of the cylinder, said last-named valve being provided with a bore in communication at opposite ends with the interior of the casing.

3. In combination with a cylinder and piston reciprocating therein, a pressure fluid supply head mounted upon the cylinder and having ports for the admission of pressure fluid to the opposite ends of the cylinder, said head being further provided with a pressure fluid supply passage, a pressure actuated slide valve mounted in the head and controlling the flow of the pressure fluid from said passage to the respective ports, a valve casing secured upon the supply head, said head and the casing having communicating ports for the admission of the pressure fluid to the opposite ends of the slide valve and being also provided with additional ports communicating with the supply passage, said casing being provided with an exhaust and a slide valve mounted in said casing and automatically actuated in the reciprocation of the iston to direct the flow of the pressure flui through the valve casing to the opposite ends of the first named slide valve, whereby the pressure fluid is alternately supplied to the opposite ends of the piston cylinder, said last-named valve being provided with a bore in communica- I tion at opposite ends with the interior of the casing.

In testimony whereof we hereunto affix our signatures in the presence of two witnesses.

WILLIAM A. MURRAY. CHARLES E. PUTNAM. Witnesses:

ALVIN F. REooRD, C. W. HYDE.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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