US2000822A - Slide valve - Google Patents

Description

May 7,1935; E. c. CLARKE 2,000,822

- S LIDE VALVE Original Filed Jan. .30, 19,34 4 Sheets-Sheet 1 ay 7, 935. E c. CLARKE 2,000,322

" suns VALVE briginal Filed Jan. 30, 1934 4 sheets-sheet 2 EQC. CLARKE I 2,000,822

SLIDE VALVE Original Filed Jan. 30, 1934 4 Slfzeefs-Sheet 3 fr g?" 229:6?

i J ////7 A May 7, 1935.

E. CLARKE SLIDHVALVE O riginaLFiIed Jam-30, 1954 "4 sums-sheet 4 .Patented May 7,1935

, UNITED STATES amaze I "sum: VALVE Eugene c. chi-re, Chambersburg, Pa, amignor Ohamberabnrg Engineering Company,

Ohambenbnrnla a corporationof Pennsylapplication original Ian 709,034. Divided and m :0, 1934, Serial no.

this application July 5,

9 Claims. (01. 121 -21) This invention. relates to improvements in slide valves, and is a division oi my copending appli-. cation for patent on Steam hammer, Serial No. 709,034, died January 30, 1934. v

A specific object of the invention is the provision of a slide-valve so constructed that wear is reduced to a 'minimum operation o! thevalve facilitated, and adjustment of the valve to compensate for wear in operation is readily effected.

A further and m'ore specific obiectof the invention is the provision of-a simple and readily producible slide valve structure in which binding of the valve and consequent excessive wear in. operation, together with diiiiculties in operation, due to unbalanced pressures upon the valve, are completely eliminated. A still further object of the invention is the provision of a valve so constructed that adjustments maybe compensatedfor and the valve inspected to determine the necessity for adjustments of its condition while it is underactualpressure.

- A further obiectof the invention is the provision of a slide valve especially adapted forv use in conjunction with steam hammers and other constructions wherein it is desirable that the valve be so constructed and mounted that it can move in at least one direction with practically no resistance.

In the steam hammers ordinarily constructed, due to the rapidity of action, it is desirable thatreversal of intake and exhaust functions shall take place as rapidly as possible. Such hammers ordinarily incorporate ports at opposite ends of the cylinder for intake and exhaust, which ports are made of the same size, and accordingly will handle equal amounts of pressure fluid and exhaust with the'samej facility. Quite obviously, a steam hammer, due to the weightof the head, the supporting rod, and. the piston, has severe gravity effects to overcome,.gravity assisting in the downstroke, and resisting movement in the up-stroke. An important factor is,'of course, to provide as rapid as possible a downstrok'e, and due togravity effects, back pressure is set up un-' less the ports employed are of relatively "large size, a

and even then noticeable'back pressure effects occur. Since-the larger the port, the 'greatenthetime required for valve movement to openand close the port; and this has resulted in the adoption of medium size, ports providing, -of course, an excess of pressure fluid inlet on'the down-stroke, and an excess of back pressure on such stroke, and an inadequate inlet on the upprovision of a port arrangement such that the intake and exhaust on these strokes may be properly proportioned, thereby eliminating back pressure effects, and materially economizing in pressure fluid., I v

Since such a port arrangement necessarily radically differs from the ordinary port arrangement, and is incapable of control by the usual type of valve, a.further object of theinvention is the provision of a valve for controlling such port arrangement. r t These and other objects I attainby the construction shown in the accompanying drawings wherein, for the purpose of illustration, I have and wherein:

An important object of this'invention isthe g Fig. 1 is a fragmentary sectionalview showing my slide valve employed in conjunction with a steam cylinder construction such as illustrated in the prior application aboveidentifled;

Fig.2 isa section online -2 of Fig. 1; Pig. 3 is'a section on line 3-3 of Fig. 1; Fig. 4 is an elevation showing one face of the valve;

is a section on'line H of Fig. 4; Fig. is auction on line 6-8 of Fig. 4; Fig. is a section on line 1-1 of'Fig. 5; Fig. 8 is a section on line H of Fig. 4; Ii'ig. 9 is a section on line !8 of Fig. 4; Fig. 10 is an elevation of one face of the adjustable'plate including the intake port; 7

Flg.'ll is an" elevation of the opposite face thereof;

Fig. 12 is a side elevation thereof; and

Fig. 13 ,is a fragmentary perspective of one of the adjusting means for adJusting said plate.

ings, the numeral Ill generally designates a valve chamber at present shown-as a portion of the casting ll of a steam hammer cylinder. The

cylinder casting has formed therein upp r and lower ducts and it for the passage of fluid pressure delivered to' the cylinder and exhausted therefrom. The lower passage I3 is relatively with the valve chamber I. through relatively restricted. port I I; while the duct I3 is branched and communicates with the valve chamber through ports I. and II ofthe samefapproximate haust e I! provided will eliminate any.

back pressure eilects. Conversely, on the upstroke the passage It affords. means for admission of a relatively large amoimtof fluid during a short period, thus giving the initial speed necessary on the up-stroke; while the restricted port It provides the necessary cushioning to prevent .overrunningofthepistonPandeonsequentdamage to the cylinder.

of the pressure area at the outer face of the plate- As illustrated, the plate ll iorms one working face of the valve chamber,'and the opposite working surface thereof is formed by an adjustable pressure plate designated at it. This pressure plate has a centrally located port I! communicating through anysuitable throttle valve II with a source of motive fluid presure. The plate II has a male joint connection at I! with a port 22 leading from the throttle valve 2|, this connection having about its periphery a seat for packing II, providing the seal between the plate and the entry port for-motive fluid. It will be noted that pressure of the motive fluid will be exerted against the pressure plate to urge the same toward the wear plate ll through an area equal to the dimeter of the joint connection at the periphery of the pachng seat, minus the area oi. the port I! at the point of communication with the plates between. wear and pressure plates and II. Comparison of these areas may bereadily had by an inspection of Fig. 11 in which the periphe y appears at "and the mouth of the port it is indicated in dotted lines.

Between pressure plate I8 and the wall of the chamber II are arranged adjusting means gener ally designated at 2! and engaging the outer face 0! the plate at points adjacent the upper and lower ends thereof. These adjusting means, as

shown in, Fig. 12, each comprises a trough-shaped the possible recession of plate I! from plate ll.

A further adjusting means '2! similar to the adlusting means 2! is employed to vertically locate plate II in the chamber. The plate, llhas formed therein a false port "-0 corresponding in size and location to the openingof port it through the inner face ,ofplate ll. l'alseport lF-a comes into operation only in event 01 overtravel of the valve which might occur either from improper setting or breakage in the mechanism attached to the valve. In such an event, this take and exhaust chambers II and Il. In the present type of valve construction, the intake chamber is divided into two sections which are connected by a vertically extending duct formed in the valve body, see Fig. 6. Each these chambers opens through opposite walls the valve body through openings of equal area. The exhaust chamber 32 opens through. one face ofthevalvethroughaport ,throughthe sides the opposite face of the valve from the port 84,

ally formed therethrough ducts 31, II and a.

the purpose of which is to establish communication between each port II, It and I1 and its corthrough a duct 8'. The valve body has addltionrspondingfalse port'lI-a', iQ-aorl'I-a. The

port ll isrmaintained in continual communicaiion with its false port through the upper section of the intake chamber.

with a valve of the type illustrated positioned as shown in Fig. 1, when the valve is elevated, port ll is'placed ineommunication with port ll, andsteamisadmittedtothe upperendofthe cylinder; at the same time the chamber 82 is thrown in communication with port it, and port l1 hssaccessto thespace around the valve from beneath the valve. when the valve is lowered, chamber II is thrown into communication with port I. through its upper/section, and the port ll through its lower section; while port I is in communication with the space about the val from above the valve.

It will be noted that since pressure areas on opposite faces of the valves are equal, and since plates I4 and ll have corresponding pressure areas through which pressure may be exerted against the valve, the only pressure to which valve II will be subjected in operation will be the pressure resulting from adjustment of the plate ll, plate against the wall of thevalve chamber. It will also be noted that the space about the valve designated at is subjected only to exhaust pressures, and since this space extends entirely around the valve, there is no resistance of ex- 'direction. Likewise, since only exhaust pressure exists about the valve, there is no necessity for heavily reinforced cover plates, and a light cover plate ll may be employed which, when removed, will afford access to the valve without the necessity of cutting oil the supply of motive fluid, so that the valve may be inspected in actual operation.

In order that the pressure exerted through plate I. may be'readily regulated and controlled to the setting aflorded by the shims 28, the dicetlve area of intake chamber ll against plate II is made such that it exceeds the eifeetive area of pressure application through the incoming steam, which tends to urge plate I! from the plate ll. The steam pressure thus acts toforce the plate it toward the intake port 22 and seat it firmly against the adjusting means 2|. with this arrangement, it is possible to set up" the valve to such an extent that-there will be actual binding in the absence of fluid pressure; and the valve will be freed immediately upon the admission or pressure fluid to such an extent that it will drop by gravity. A valve construction'of this character with proper adjustment of the means II will 1 at all times operate by gravity on the downstroke, thus making the construction especislly adaptabletousoinfluidll being stationarily secured haust pressure to movement of the valve in either- 15 tion areas at its opposite faces, a pair of surthe hammer to itsraised position following a working stroke.

Obviously, certain features ofthe valve may likewise be employed with equal facility in a .number of other forms, as for example, in the slide valve mechanism of a locomotive. Since the valve must necessarily be changed as to its operating structure for adaptation to various types of cylinders, I do not wish to be understood as limiting myself to the particular arrangement herein illustrated except as hereinafter claimed.

I claim: v .1. A slide valve comprising a reciprocatery valve body havlnl equal fluid pressure distribu- 1 slides, a plate opposing the opposite face of the 'portanditsfalseportp valve and having a port for delivery of pressure to the valve body, said plate being mounted for movement toward and away from the valve body,

' arranged to limit separation of the plate from the valve body, and means for maintaining,a preponderance of fluid pressure against the valve bodyopposingfaceoftheplater 1 3. In a slide valve, a reciprocatory valve body, a surface against which one face of the valve slides, a plate opposing the opposite face of the valve and having a port for delivery ofpressure to the valve body, said plate being mounted for movement toward and away. from the valve body, adjusting means at that face-of the plate which is remote from the valve body constructed and arranged to limit separation of the plate from the valve body, and means formaintaining 9,009,822 'merconstructionsbyinsuringaquickreturn of Q 3 and having an interiorly formed fluid pressure distribution chamber, a plate arranged between the inlet and the valve body and contacting with the valve body and sealed to said inlet, the plate having a port for conducting fluid pressure to the chamber of the valve body, means for conducting exhaust fluids from one of the .distribution ports through the valve body to thechamberabout the valve, the, first-named 'wall comprising a plate movable toward and away'from the valvebod'y,

adjustable means at the outer face of said plate for limiting separation of the valve and plate, and means tomaint'ain a preponderance of fluid pressure against the valve confronting side ofsaid receiving the valv'e' and including walls fltting against opposite faces of the valve, a supply port in one of said walls, distribution ports in the other of said walls, the remaining walls of the chamber deflning an ,eihaust space about the 8.- In a slide valve,'a valve body, a chamber sides of the valve, said distribution ports including a port permanently covered by the valve, a port in the valve body to place said permanently covered distribution port in communication with said exhaust space in one position of the valve body, and a second port in the valve body placing the said distribution port in communication with the supply port in a second pgfltion of the valve 7. a slide valve, -a valve body, a chamber receiving the valve and-includinz walls fltting against opposite faces of the valve, a supply port in one of said walls, distribution ports in the other of said walls, the remaining walls of the chamber defining an exhaust space about the sides of the valve, saiddistribution ports including a port permanently covered by the valve, a port in the valve body to place said permanent-' a of fluid pressure against the y valvefbody opposing face. of the plate, said'sur face having distribution ports, eachof said 'surfaceand platehavinginitsvalvebodyconfronting-facefalseportscorrespondingtotheportsof theother thereof, said body constructed and ar- .rangedtomaintaintheportsincommimication withtheircorrespondingfalseportsandtomaintainequalpressure areasin opposition toeacb having a 4.Inas lidevalve,avalvechamber fluid-pressure port in one wall thereof-and fluid pressure distribution ports inopposite 'therecflavalvebodyarrangedbetweensaidwalls andhavinganinteriorlyformedfluidm'essln'e'distribution chamber, a plate arramed between the inletandthe valve body'and contacting withthe valvebodyandsealedtosaidinlehtbeplatemw ing a port forconducting'fluid preuure to the chamberofthevalvebodyundmunaforcon the valve.

portsthroughthevalvebodytothechambe'rabout 5. In a slide valve, avalve having a fluid pressure port in wall thereof and fluid pressure distribution ports-in the opposite wall 8. a slidevalve, a valve chamber a fluid pressure port in one wall thereof and fluid pressure'distrlbution ports in the opposite wall thereof, a'valve body arranged between said walls and having an'interiorlyformed fluid pressure 4 distribution chamber, a plate arranged between the inlet and the valve body and contacting'with the valve body and sealed to said inlet, the, plate having a port for conducting fluid under'pressure topthe chamber of the valve body, meansfor.

fluidsfrom one of thedistributionportsthroughthevalvebodytothechamberaboutthevalve,andmeanstoimpartamoveinentfof the valve alternately reports directlytOthecham- In a slide valve,' a valve chamber having mainingdistribution her about the valve.

between the inlet and the valve body,

t w s with. the valve'body and m? T inlet,theplatehavingaportforccmhictingfluidf under-pressuretothecliamberofthevalvebody,-

',avalvebodyarrangedb etweensaidwallsmeans for from one 15 of the distribution ports through the valve body from the volve body, ndjulteble means at the to the chamber about the valve, means to impart outer face of said plate for limiting separation a. movement or the valve alternately exposing o! the plate end valve. end means to mnintnin the remaining distribution pats directly to the the preponderance of fluid pressure nainst the 4 5 chamber about the valve, the first-named well vllve-eonirontinl aide at said plete.

comprising a plate movable toward and away IUQINI C. CLARKE.

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