US1148160A - Automatic valve. - Google Patents

Description

T. M. EYNON.

AUTOMATIC VALVE. APPLICATION FILED sPT.27. 1912.

1, 1 48, 1 60. Patented July 27, 1915.

2 SHEETS-SHEET I.

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jfl II l I I I rron n COLUMBIA PLANOGRAPH co., WASHINGTON. D. c.

T. M. EYNON.

AUTOMATIC VALVE.

APPLICATION FILED SEPT-27, l9l2.

2 SHEETS-SHEET 2.

lu u Eh 30 I Il CQLUMBIA PLANODRAPH CO-JVASHINGNN, D. C.

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AUTOMATIC VALVE.

Specification of Letters Patent.

Application filed September 27, 1912. Serial No. 722,565.

To all whom it may concern Be it known that I, THOMAS M. EYNON,

the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Automatic Valve, of which the following is a specification.

The purpose of my invention is to provide a fluid cushion and support for valves preferably by the use of ports providing free.

inlet of the fluid controlled for a part of the stroke of the valve and cutting off or trapping this supply prior to the seating of the valve.

Avfurtlier purpose of my invention is to provide a dash pot for a valve with fluid connection to the body upon both sides of the valve when the valve is open, with ,closure of these connections by reason of movement of the valve, forming the connection with the far side of the valve, preferably,

i except for a-cylindrical guide opening 17 through a hollow valve stem.

A further purpose of my invention is toprovide for admission of fluid to both sides of a dash pot piston at an intermediate position of a double closure valve, cutting off this connection in proximity to each limit of movement of the valve and by reason of this movement.

A further purpose of my invention is to provide a valve with dash pot protection against excessive downward movement, and. 7 means for refilling the dash pot positivelyj with each movement of the valve.

. \Vhile my valve will find utility in'many forms and in many lines of duty, I have preferred to illustrate two forms thereof, which I have proved to be most simple, effective and least expensive, and to explain these forms in their use in connecting the boilers of a.

battery with a common main steam header from which the steam is taken.

A further purpose of my invention is to b, protect a boiler from Xcessive steam outlet by providing a valve in a steam pipe thereof with an auxiliary seat against which eXcessive flow of steam will seatthe valve, and

cushioning the valve as it-is about to seat at each end. v p p A further purpose of my invention is to provide an automatic valvewith seating at both ends of its stroke and to cushion the valve, preferably by the fluid pressure used,

at both ends of its movement.

Figure 1 is a longitudinal section through the center of the preferred form of my valve. Fig. 2is a corresponding section of a citizen of the United States, residing at i 1426 Allegheny avenue, Philadelphia, in

body of the valve 1 or 1 as provided with another form. I

In both of these forms I have shown the inlet 2 and outlet 3 and with a seat at close to the inlet opening and here conveniently supplied by any suitable cylinder 5, 5,

flanged at 6, so that it may be retained in place between the flanged connection of the pipe with which the valve is to be used at this end and the flange 7 of the valve. In each of these forms I have provided a convenient valve'guide inthe form of a central sleeve 8, within which the stem extension 9 or 9 of the valve moves, and have supported the sleeve by webs 10. At the up-- per end of each of these valve bodies, I have retained a cylinder such as 11 or 11, by a flange 12 held within a recess 13 in the valve body flange 1% by a yoke 15. The lower part of each cylinder 11, 11" is closed as atlG,

axially in line with sleeve 8 and forming a guide for a stem 18 or 18, extending upon the opposite side of the valve from the stem 9 or 9. In eachof these forms a piston 19 is attached by any suitable means as by threads 20 to the end of the stem'18 or. 18

and the lower surface 21 of this piston is der, to performthefunctions herein pointed out for theinunder the circumstances of the H part cular installation.

In the formwshown inl Fig. 1 the'valve stem is provided with a preferably central longitudinal opening 26, freely communicating with the fluid handled, hereafter for convenience called steam, at;the inlet opening of the valve and connecting with ports 27 in the stem 18. 'Gbviously, since.

no provision is made to prevent it and the stem is aneasy-iitwithin the guide, there will be leakage of steam in the position of the parts shown Fig. 1 between the in- Patentedil'uly 27, mm

that within the boiler.

pressure otherwiseexist between its pressure and that of the header, and into the space 29 within the cup, when openings 25 are not used, with the result that the pressure upon the bottom of the valve and upon the bottom of the piston will tend to lift the valve while the pressure upon the top of the valve and upon the top of the piston will tend to close it. It will also be evident that there is free access of steam from the boiler side of the valve to the space between the piston and the bottom of the cylinder as soon as the piston has been raised sufficiently to expose the ports 27.

I have accomplished a similar purpose and function with corresponding port operation in the form shown in Fig. 2, without use of a hollow valve stem, by passing steam from theboiler (inlet) side of the valve through any suitable connections, here shown as pipes 30, 31 and 32 to a port 33 opened and closed by the side of the piston itself and leaking steam slowly into the space 28 and space 29 respectively when the boiler pressure substantially exceeds that in either of these spaces. I have provided for control of the flow of steam through the port 33 by means of a seat 34 and valve pin 35, guided at 36 and protected by gland 37 In each of the forms shown, I have controlled the total movement of the valve by means of a plunger 38 passing through and protected by gland 39 and moved longitudinally by means of wheel 40, threaded stem ll and nut 42, which latter is supported in the yoke in anysuitable manner. The head d3 of the plunger may obviously be A moved longitudinally to engage with the operation indicated.

ticular boiler upon which it is being used head a l upon the valve at any desired point of limitation of valve movement.

The leakage for which I have provided may be accentuated by any well known means and lies within the full control of the mechanic, the object being to. permit relatively slow passage of steam between, when.

the pressures in the adjoining parts difi'er by any considerable extent, without permitting rapid enough flow of steam to prevent good damping or dash-pot efiect in the The operationis' the same in both of the forms. The valve will remain in the closed position shown untilthe steam in the parappreciably exceeds in pressure that of the header into which this boiler is intended to feed. The extent of difierence in pressure required to open the valve may be controlled readily by variation in the proportion of the surfaces upon which the boiler and header pressures are exerted.

When the pressure of the steam in the boiler has become sufiicient to move the valve and it opens, the flow of the steam will normally cause a movement of the valve at least far enough for the port 27 or 33 to be exposed so that steam will be fed freely into the space 28 within which the pressure has in the meantime been considerably reduced by the enlargement of the space without correspondingly increased admission of steam. The pressure within the space 28 will be brought up immediately to the boiler pressure andwill be maintained in agreement with this boiler pressure until the pressure of the boiler and that of the header have been nearly or entirely equalized. The openings 2% permit free passage of this boiler pressure steam into the header, preventing excessive pressure which would tend to cause undue movement of the valve. The weight of the valve also exerts a retarding influence. The openings 25 may be used to permit any desired freedom of exhaust of steam from the space 29 and for this reason are necessarily large enough to permit free inlet and outlet of steam between this space and the header side of the valve during the movements of the valve.

Difiiculty has been experienced in pre-' venting the valve from chattering or hammering upon its seat and my invention substantially eliminates this difficulty by the live steam cushiontrapped within the space 28 when downward movement of the valve has caused closure of the ports 24 and 27. An efiective cushion is thus provided preventing sudden closure of the valve and re lievmg the blow even when, for example, the breaking of a tube reduces the boiler pressure suddenly and the header pressure tends to close the valve quite abruptly. The provision of ports protects against undue closing violence. When the valve, for this or any other reason, moves rapidly toward its seat 41:, the steam can escape freely from beneath the piston through the openings 2t until these are closed by the piston in its travel, which may occur at'approximately the same time that the ports 27 or 33 are closed,cutting off efliux of steam through these ports and trapping the steam then in space 28, which steam can escape but slowly as permitted by the leakage provided and affords a resilient cushion to the movement of the valve.

In each of my forms I provide an auxiliary valve annulus 45 upon the outlet side of the valve 23 and arrange for sufiicient possible movement of the valve for it to en gage 'with the auxiliary seat 46 to close opening 47. This is for protection against excessive outflow of steam through any of the valves where'the header pressurehas been suddenly reduced.

At the first excessive the boiler through the valve, the inertia of the moving steam will cause the valve to lift into approaching contact between the annulus 45 and the auxiliary seat 46. I locate the openings 25 far enough away from the end 48 of the space 29 totrap a considerable quantity of steam within this space 29 with this movement of the valve. As soon astho piston closes the openings 25 this trapped steam cushions the movement of the piston in this direction also by this dash-pot means.

It will be evident that I cushion the valve in both directions of movement in each of the forms by which I have preferred to illustrate my invention; and that the extent of cushioning and of protection against hammering of the valve in either direction of movement is withinthe control of the designer for the particular installations. in

mind by suitably proportioning the extent of movement after cushionlngr and the size.

of the openings, or amount of leakage through which steam may be passed both before and after cushioning. With the information which I have supplied vidently other forms of applying the damper effect may be designed which lie within the spirit piston when the valve is closed, than in some other construction or constructions. This and other matters of similar character will come within the scope of the mechanic in view of my disclosure herein. 4

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

1. In an automatic valve, a valve body having inlet and outlet openings, a valve seat about the inlet opening, a valve guided to move therein, a piston, ahollow stem connecting the valve and piston and ported in proximity to the piston and a cylinder having one end surrounding the hollow stem, closing the port, in the closed positionof the valve and normally open to the outlet side of the valve in proximity to the other end.

In an automatic valve, a valve body having inlet andoutlet openings, a valve in one of the openings, a stem attached to the valve, a piston upon the stem and, a

cylinder surrounding the piston and at one 7 end surrounding the stem, ,a passageway flow of steam out of adapted toconnect the cylinder and the interior of the valve body upon that side of the valve farthest from the cylinder, and

;terminating in a p ort closed in the closed position of the valve and opened to the Icylinder .withlmovement of the valve, and the cylinder. being apertured to connectwith .the interior of the valve body between the cylinder andthe valveat a point closed by the piston in the closed position of the valve and opened by reason of movement of the valve. 7

3. In an automatic valve, a valve body having inlet and outlet openings, a valve seat about one of the openings, a valve guided to move toward and from the seat, a

with movement of the valve, the two first namedconnections with the valve body being adapted to be closed by the piston at .the respective extremities of its stroke, an

apertured diaphragm inthe valve body and cooperating'seats upon the valve and about the aperture.

4. In an automatic valve, abody having inlet and outlet openings and an intermediate apertured diaphragm providing facing valve seats about the inlet opening and the aperture, a valve cooperating at the extremities of its movement with the two valve seats, a valve stem connected therewith, a piston upon the valve stem. and a cylinder surrounding the piston and having one end surrounding the stem, fluid connections being formed between the cylinder and the interior of the valve body upon both sides of the inlet opening when the valve is moved away from the seat about the inlet opening,

which connections are closed by movement of the piston when the valve is seated at that end of its stroke, and further fluid connection being formed from the cylinder to the interior of the valve body at the farther inlet and outlet openings, a valve seat about one of said openings, a valve cooperating with sald seat, a guide for sald valve, a hollow stem for said valve" having openings upon both sides of the valve, the openings upon the one side being lateral, a piston upon the stem and a cylinder surrounding the piston, apertured to communicate with the one side of the valve when the valve is &

open and having an end surrounding the stem of the valve, Where it is laterally apertured,

when the valve is closed, but surrounding a different part of the stem when the valve 7 about one of the openings, a valve cooperating therewith, a hollow valve stem there for laterally ported on the side away from the valve seat, a piston on the valve stem and a cylinder laterally apertured to the valve body and having an endsurrounding and closing the lateral porting of the stem When the valve is closed.

, THOMAS M. EYNON.

lVitnesses:

HELEN I. KAUFFMAN, WM. STEELL JACKSON.

Copies of this patent-may be obtained for five cents each, by addressing the Commissioner of Patents, a V 'Washington,1). c."

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