US2334047A - Radiator air valve - Google Patents

Description

Nov. 9, 1943.

W. TUTTLE v RADIATOR AIR VALVE Filed July 25, 1941 2 Sheets-Sheet 1 Nov. 9, 1943. w. TUTTLE 334,64?

RADIATOR AIR VALVE Filed July 25, 1941 2 Sheetza-Shee'c 2 A75-j lim ATTORNEYS Patented Nov. 9, 1943 Wainwright Tuttle, Madison, N.J., assignor to-` Bridgeport Brass Company, Bridgeport, Conn.,

a corporation of Connecticut Applicatio'niuiy 2,5, 1941, serial No. 403,941

13 claims.V (crass-s3) The present invention relates to air valves and more particularly to air valves used in conjunction with radiators employed in heating systems.

One of the principal objects of this invention is the provision of novel means for preventingI Water which may be present in the valve while it is ventingV from reaching the exit orifice and escaping from the valve.

Another object of the invention is to provide effective silencing means whereby quiet venting of the valve results.

Still another object isto provide novel spread band venting adjustment meanswhich will per` mit geometric rather than arithmetic control of the venting rate whereby there is a better spread of desirable adjustability over the control range, achieving thus a venting controlr analo-M4 gous to "spread band tuning control in'radio.

A further object is the provision of novel f adapter means to facilitate usev of the air valve with either side, or top venting oriiice providedV radiators.

Another object is the provision of an air valvey which may be manufactured lcheaply and simply assembled, and which comprises a minimum number of working Darts.

To the accomplishment of the foregoing and I,

such other objects as may hereinafter appear,

this invention consists in the novel construction and arrangement of parts hereinafter described and then sought to bev defined in the appended' claims, referencebeing had to the accompanying drawings forming part hereof and which show,`,

merely for the purposes 'of illustrative disclosure, preferred embodiments of the invention, it being expressly understood, however, thatr various changes may7 be made in practice withinthfe.- scope oi the claims without digressing from the inventive idea. y

InV the drawings, in which similar reference characters denote corresponding parts,

Fig. 1 is a perspective Aview of the radiator valve applied directly tol a radiator;

Fig. 2 is a similar view of: the valve applied to a radiator of the type having a vertical' tapping for the air valve ontop, through the agency of a novel form of adapter;

Fig. 3 is a vertical sectionv of the air valve construction taken along line 3 3 of Fig. "1 and viewed in the direction of the arrows;

Fig. 4 is a vertical section taken along Vline 4 4 of Fig. 3. also viewed inthe direction ofthe arrows; y

Fig. 5 is a transverse section taken along line 5 5 of Fig. 3, also'viewed in the directionjof the 'j Fig. 6 is a transverse section taken alongfline* A 6 6 of Fig. 3, also Viewed in' the direction of the arrows; and Y n Fig. 7 `is a partialfverti'cal section taken along line 'I 'I of Fig. 2, illustrating detailsv of cori-V struction of the adapter.

Referring now to the drawings Ill dlenotesa hol` low air valve casing or shell. This'shell is especially shaped so as to be greater in breadth than in height or depth. The rear wall I'I is substantiany nat, the/adjacent side wens |2 andA Isere curved outwardly therefrornandthel front wall I4, which 'joins the two side walls I2 and I3, is furtherl outwardly curved' vto a shape corresponding substantially to a. portionv of a cylinder of revolution. The two curved side walls-,I2 and I3 define what may be termed wing or exten-1y sioncharr'ibersr IB and I1, which extendat'opposite'sides from ythecentral float chamber VI3 de` lined by the frontwwall I4 and rear wall II. These ,A

wing chambers have apurposetobc hereinafter described., y V.

A ,bottomlmember VZI) isy suitably attached at 2I in 'sealing relationship to the shell, as by beading andsoldering'. Thisv bottom vis"providedwith a in?, to be presently described.

'I'he to vided with asingle opening 30 in which 'a valve Y seatjbody 3|", to be presently described, is mount-N ed.l An annular ridgev l32, concentric with the opening EN), is'provided'in the top "24'for vanpur-l` pose to be presently described. n y

The rearwall I I has an opening 33`whose edge is offset, defining a ilange 3,4. A suitable threaded spud) 35 is provided. ',This spud hasa support-- ing flange 36` which may be annular, engaging' iiange 34 and suitably attachedtheretof,las by soldering or the like.

manner. .The threaded portionf38 ofjthe spud facilitatesquick attachment of the device to a radiator or other part, as will be hereinafter described.`

A hollowreceptacle 40 rests on the inner end -4 of the positioning screw 23. This receptacle acts as a. iioat and also contains an'expansible'fluid 4I which, when'steamV or hot water venters the chamber I-Sfbecomes heated and expands, and

threaded opening 22 into which a float-positiony member, or screw 23 is screwed for laxpurpose I 24 of the casing'fll, which,` in the em' boclfi'ment shown, is integral with its side Walls"v II, I2, ,I3 and I4, and substantially ilat, is' pro'-l YThe passageway 31m tire spud serves as an air and steaminlet toand asa ,v Water outlet from the chamber I8l in well-known* Y 2,334,047 fff l The valve seatlbody Stcompris a 'substantial` vly cylindrical' bodyof suitable materialfsuch as brass or other metal which is provided on its bottom with a downwardly extending skirt or flange 46 which terminates in a sharp dripping edge 41.1

'I'he dripping edge is at a comparatively large distance from .the orifice 45. The liogyiS'I-isshouldered at 48 and the reducedportin' adjacent they shoulder fits'into. and extends through the` opening 30 to the upper side of thefcasing tap.' be;

Y ing suitably attached in place as by solderingr at 50, or the. like. The b ody is further reduedi'in which receive the oat 40 and guide its vertical movement.

Also integral with the wall 6I, and extendingv horizontally therefrom into the spud passageway 31, isa drip guide flange 14.r This flange has a Width slightly less than the diameter of the spud passageway 31and divides the latter into two separate compartments. The upper (air). compart mehtis largethnn thelower (water) compart-` 1 ment. This reduces resistance to air in now. At

thesame time Water canflow out more readilyl The outer endfof the drip ange 14 is bent upon .itself into channel form to facilitate return flow of water from the chamber I'8.

lA suitableguide abutment 80 is provided at the front wall* |42 This abutment, together-'With the cumadgesniwor the guide nanges 1o and 1| t servestocenterthe float with respect to outdialneterg and tapered at Handv pfrovidedlwitlra g flat top seating surface 52 into which the escape;I

li3fintegral; l.with the 'bodyy ,3l4 extends upwyxrdl)7 of. the surface 52. This stud serves f oratta-h-f let passageway 45, and to guide its movement verticallm'fpreventing disarrangement ofcthe valvey pin. fwithfrespect to vthemseati-M in valwefhdgf.

Y extend tar'enougn. casing tossine as;

ment of venting controlA andA silencing parte* toX be presentlydescribed;

A combination drip,

air :isl l provided-infthefchamber I8. Uhisfgliideisfsoqde signed. asvto 4direct' the ain entering .the chamber.V

from-'the radiator upwardly Substantiiafprlv lel toand/'alongside the rear'wall yM to afppint above the ,usual limnidalevel` L. inithel chamber. Hi.,-

andv thenv laterally intwo;oppositestreams toward f the wana ganarle @time wingqhambersgefana I1. atVv points If'errwteffmm the -1ewape rpassasaway so that the patha for,l air. and?entrai,ned.v

droplets of.l moisture lawafmtothe' l incaqedto anextentfwhich; to-all practicalg-pm-fl poses,yeliminates the, blowing g Of-drplets through the soave www 451W *beeswax body :31, 'and ria centenedywitn respectthggm pa l 1.

Y tion. of the; drop1ets.from the Vsin:1,nlgits..ffmssage, -L the stud 53 which project's'through a cen'trfallglpQ1 vv through Vthefcapsirig? Thisgdirection o fllfqlfie. has the effect of making the horizontal component Y.

of air velocity substantially larger thanfitivtif cal component/ so that droplets ofentraixedwaften can fallmereiffraly. nndwsravity actuation with-- Out-.mening @Se 0133.@ er '3319. W531i dlr'. tioxa'of` tlael aizablolwysit` intofcontalct with' Il and `llibfeforeit reaches outletpaasageway providingv additional' inertiafgorce'ntril'uglal s'p'q iq `araftilanfe'ile-cti for the moistureor droplet content L 'l a partitionlngwalll extendingrsubstanttallgf. par.

the Iuge. at" su@ the waa' @and withv latter .and'wnllll averticalfai'r passage' B5.

ings amar the an as above `said ter level; inlet wall' 5l has .two eppositeb'extend inggudeang'as-Bag'gi'nthe region idf the openings 61 .to laid- 'gglidihdthe air. Aemerging from the openings toward. and. intofthe' Wing.

I5 and I1. `These flanges 69 extend subst'an,tillyV parallel wille Sins Wad-lA *tand @Ie-Pauw .miemfectea' luso', silencing meansln guidesin. place of. and-.for v the same/purpose Vexaitngf` ofy air. through the passagewayg iste'. be at a controlled rate; venting .rate 9L this .y device herein is adapted to be ay than, arithmetic, progression whereby# a. wel Y analogous.to.=spread in .radpyisefw the controimeans :are provided. whereby quiet, as wellas.controlledgventnsdaeled Toaaoomw plisltlis,aniolnlatoris-provided.`4` y -f `'Ifhisirnmnllatar. m mapaoqxmenrsbown @fm-f prseaan invertedwpfshapedshellr This shallhas. a-reeltrantcentallx ldcated nQr-tionlll in. it? I end wall.. Bwhicllissubstantially cylindrical inv shapeandpmvideawlma bottom-as. maatstaf f is adapted tdSeat'onthesurfa'ce 57. of thevalve.

cateaopenina wntheaid bottom, 84,. i

92, taitsgjunction.. 83' with;l an arbuateopenrslot..

and groovefat their Junctionrespectivaiy lf of widths' 'which prev-,Imi continuous. n'crsmbotn, I

increase m ventmalrazislWarmmiete;in

the groeve ist; The uarrowest pmicn Hag the vaive tas-widest .at the" V5101; stat y is substantially equal mdianeter'' tomatoftneexa-erimels. The rate f ci` dimensions of the groove and slb'tare #si togpro'vide a geometricmtmgcmtro rati;

The ends 92 andN/areseparated. l'

Ation 9i Uf. the Mmm BillsDolitixtifls'tfy admeasnredttl'mt ltiimmemn wwetlriclosev the 'oricefv when overlyinggilm'imera v. f fr;

A plurality of suitably arranmelulerftiims; 98. .are nrwideilidm` thel 'botten These@ formons we so immensa fas :te ovuli# for apurpose tobe presently dwrtbed..

The cuter skirt. 9% ofthe, modulator meinber- 86 is so admeasuredin heightand diameter .l

the casing top 24, except fora small .portion at the rear wall H of the casingwhi'ch overhangs the latter to vprovide a clearance passage (Fig. 3) for escape of air, as will be presently described. The top surface of vthe casingis roughened so that the bottom edge of the modulator does not lie in sealing engagement with it.V

Thechamber |0|, defined by the modulator and top ywall 24, serves asa silencing'ch'amber, as will into chamber |0| through the .perforations 98` which offer large resistance toA the sound wave created 'by the air emerging from orifice 45, but little resistance to' airflow. `This prevents most of the noise of impingement of the original air jet from orifice 45 from reaching the chamber ISI. Escaping air in the latter is much quieter, but still audible. Thisin turn., is reilected by the ridge 32 into and is quieted bythev comparatively large chamber |0I, in which the sound waves expand. The nal escape of air into the room occurs all around, between the skirt edge 09 and the top surfaceof ther casing I0, and largely through the clearance |00. .j The result is elicient silencing of ventinglfrorn the radiator.

The modulator skirt 99 externally isV provided extends transversely' at I |4-.l The body is providedv with a longitudinal bore H5 which yterminates at comprises a body of suitable material, such as cast iron, or `the like. V'Ihis body has threaded spud H| at one end diniensioned to t the threaded portion 'I" 'of the radiator opening T. The body ares outwardly from the threaded portion at H2 and terminates in a head H3 which its inner end in an enlarged chamber H6'n in the head` H3. A transversely extending threaded bore H1 in the head H3 alsocommunicates with the chamber H6 so that a complete passageway through theA body, with aright-angle bend there,-

with indicator marks to denote diierent degrees lator is rotated the change of groove and/or slot v dimensions over the orice 4,5 from numerals I to X is such that the flow increases about (actually 61.7% in one embodiment) per step. That is, numeral I, opposite indicator |05, represents the lowest rate of flow. vWith numeral Il; opposite indicator |05, the slot and groove have been rotated so that venting, is about 60% higher in cubic feet per hour than atl, and at II, `about 60% higher than at II, .et cetera. .This provides` spread band adjustment ofthev venting rate. The geometric, rather than arithmetic, progression of venting rate provides a control analogous to spread band tuning in radio.

The spud 35 isl normally screwed directly into the usual side opening (not shown) of a radiator R and the valve is ready for use.y

The valve, however, may also be used'with convector type radiators R' which usually have a Verticaltapping 'I' for the air valve on top. In such cases, since the air valve will not operate properly if the oatis other than vertical, an adapter becomes necessary.l However, since the overall height of the ,air valve isr comparativelyA smalLVthe casing l0 has `a small" swing about its spud 35, and, as a result, the adapter canalso be short'. v'

. and fast elimination by gravity, of the moisture,v

in is provided. The spud 35 is adapted to threadedly engage in the bore. I'I. The adapter H0, whenV attached for the opening T' in effect, provides a horizontal outlet vfor the radiator into which the threaded spud 35 can A.besc'rewed l A split-drip or syphon tube |20, carried in the bore H5, provides positive drain back." The tube hasra split, or slot lill, extending its fullzlength. With the split tube, the syphon effect isl riot lost, yet water can enter itat any point. A `plain tube,

even Wih a hole drilled init, just above the point where it projects from the bottom, will hang up (remain water, bound). The split tube eliminates this difficulty.y 'At its inner end the tube |20 is provided with vwings |22 ,which engage the shoulder |23 dened atthe entrance of bore H5 into chamber H6. These Ywings are'sufiiciently deformable and compressible because of the split |2| to permit the tube` to be assembled'with the..

adapter by pushing it through the bore I5 from der|23. v

The height of ,the tapered; portion H2 of the adapter body is rjust sufficient to permit clearance above the radiator for rotation of. the valve casing I0 with spud 35 as a center duringitsattachment in the adapter opening. I1..- This -height is comparatively short becauseof thesmall height of the valve casing |0.

In operation of the air'rvalve, air fromk the` radiator enters the ` Spud 3,5. primarilyl inthe upper compartment above the partition 14, and is die rected upwardly in the passageway 65 by the wall 6 I, passing outwardly therefrom in dual oppositely moving streams above the'liquid level lin the casing |0` through the openings (il,` In its movementy thel air carries with it droplets of moisture from the radiator. The main velocity components of the air and droplets. as its streams emerge from the openings 61,'are horizontal, while the vertical whirling action, andconsequent longer path forv theairbeiore it reachesthe' exit oriiice 45. In this len'gthen'edv pathgravity-action on the drop-- lets is greater than the small vertical airy velocity components and permitssubstantially' complete casing |0,"into the 'separation space 'abovelthe' water level andinto the wings v|6'ar1d |"|at a considerable distance IrCmthe'eXit orifice 45. V4This 1n the embodiment showafthe 'adapter no,

i facilitate@ drainage l diator R.`

alloys space frl the bubbles tQXPandnd burst elle condense@ Sala-Shad 0n' the iai? maar. SUI the. body. freni www@ .exit Ories drPPS will dripz .Ofl @he sharp Skirt end I Sinc faceaf,

said enigmista enig quinti andthe entraine@ t dreplefi. 0f; mili-itil?? fm@ saf meeting. Said pairr of opnsd'tfacesadfidannins than@ @tailed @ma .'.Qiiaesi'temugprfef tiene 9.3 inta Chamber-1', when?? it il h residualsgund wave.`isr reflected by the @anular scribed abQve-j expands to' Seaview? body. 435.01; its Seat!! t.

snutoizjiae. val velai'nie' and tinus einem. esape ter `enters thelvalve, the

The adiustmentrew 2.3. Svesiqfr'egulate'tlie Clit-0.1i 'tampeature farl the valifefbyllregul'at-ing erinsai 23' weelde: 0r the like.

Excess water, in the V'valve 'at any time deim' in, welll-known manner. through the lower." com@ partmen .in theY Spud. 3.5,; befassisted lilythe.

ber 14.

lune adapierisnsed, inespiitsmhoniub.l2?

ia" the adapte "te theres Eetrady feferena: messer-.d @Seien 130'y ihlsimulatin. Qf the. venting @entre groeve 9.!

diatioa of the reame., veniiligfcniwlrt?! groeve limes. be visually'set .91? .framing bellers@ Orthez mcdulatvnbv 8121115 1t @019mg -dfeeei mlm-that Qfthe balance Qf'the mqdiilatcr;

While specific wbodmentl Qi @aiment-in@ have been it? left@ be vndreiodthet amnestie@@escaped-ee@Miedema Y are cognatemplated.` There is nointenltvion olf-liu'ii.-

tat-icnftethe exact details shown and, described- I claim: Y 1. In a device of the character, described, a casing having a pair of opposed] faces defining. 'a

`float chamber andf joining faces connecting saidgv two opposed faces, said joining faces ydefining .a

pair offwing chamberseach adjacent said` float i chamber and opposite each other. and each being in free''con'zmunicatlon with saidfloatchambex';V one of said opposed faces having an inlet in -itsf lower region leading to said` i oat chamber', f and a lguide member within said float chamberoppdy site' lsaid inlet and-provided lwith asubstantially. verticalpassagewayxopening, into two oppositebr directedy passagewaysjabcve the normali liquid level ink said device for guiding. air and entrained droplets of moisturezdischarged intosaid inlet v from a-radiator first upwardly abpve the saidA v normal liquid level and .then .in oppqsitely, di-

rected streams toward intosaid wins-chaine f bersl and from there into said float chamber.

said float chamber having an outlet in its 59p forA the venting off all* through illes). -thlhf @Wesel/:imaged devi@ ,fpm gidin ein and Bin dr. 'niets 0i has` largerfhorzptal than',` verticali Qqmmnts of velocity,- in portions of its patha at least, to facilitate gravity Svrationqf, entrainedfdxps through Water. in

`34- Inaflevicelbn, "Y winghavin's a www? neat chamber.' an? ing said Apair .of Oppositelaleaated of,whichisim'oxien.compnmiptiqalthseid chamber, ,one of saidoapqged faceshailins an air inlet adjacent its bottiglia-1,eadli;g to thev w .Chambery a lulde member. arraiiseqfwl,

V at chamber.oppasle`said inlefiad 'revided `with a substalntizll'fvfertlcal passage; 0129111118 into olivositeladr'ected'hrilmital Saways above'. the. hemel liguid level 'ip said device, f olj guidlpg Tulp, j"

t graba tbe Lshape Qt curved J'oinlngffaces wlth'a' whirling Jetioq into said oatchamb'ensaid, ilgat cliambei; haymf Dit k .b V` `forftheventinlof^ air rm i, where Y'thelaifpasslns-thrqh J than verticali ing an ,outlet in .its

chambers has large@ h componerirs of. velociiviabrhpns of Remains! at least to.; failiizaie. mvitysebaraoalor et trained drops of imm 'The'aiifprlpr its said venting. 10i'. yrlltlellllfi the` mtg tf. venting' tarnish saidiir'jouiiexft i 4. In a devicec'gt.f f V Casing .havinga mir @Wirral-ee d'1 a float chamber and clrvedfacesf necting. said pair eff o ngsdfacesandlde mi meer' am mais' an @la ,aai

neat chamber, aguidempmlypnareransed n said neat hamper mippgiiige.liedl inlet fa iiuias. muvesiV faces" cannetfaces and defining; auxiliari vine nnamhrls x t emr'inedidonlei* ormoistune enteringsaid inlet l'st izo-above the saidfnonnal'liquid'lgveljandihen laterally? in oppostely streams Wing dias ndvrqr? vided with a substantially vertical passagewayJ other end, a temperature-operated valve Within said casingl cooperating with'saidfseat, a member opening into'op'positely directed horizontal passageways above `thenormal liquid level in said opposit'ely directed streams .into said wing chambers and from there by the shape of said curved joining faces with a whirling motion into said lfloat -chambenrsaid float chamber having an-air outletr in its topv for the `ventingiof air from it if whereby? the air :passing through said chambers has largerhorizontal than vertical components of velocity in portions of its paths .at least to yfacilitate gravity-separation of entrained drops of moisture from the air prior ytov its said venting, means in said float chamberlresponsiveto :the presence therein fof heatedvfluidrto close off said airnoutlet, andmeans for controlling the venting of air throughsaid air outlet at a geometric rate.v i

5.:In. a device of the character described, a casing having' afpair of opposed faces defining a iloat chamber and joining curved faces con-` necting said pair of opposed ,faces` and defining oppositely located auxiliary wing chambers arranged laterally thereof, each of which is in open communication with said floatlchamber, one' of said opposed faces having an air inlet adjacent its bottom leading to said float chamber, a guide member arrangedv within said'float chamber opposite said inlet and provided with av substantially vertical passageway opening'into two yoppositely'directed horizontal passageways above the normalliquid level in saidy device for guiding air and entrained droplets of'moisture entering said inlet first vertically to above the said normal liquid level and then latera'llyin oppositely directed separate streams, one toward each wing chamber, and from there by the shape of said curved joining faces With a whirling motion into said float chamber, saidriloat'chamber having an air out'iet for the -venting of air through it whereby the air passing through said chambers has larger horizontal than vertical components of velocity to facilitate gravity separation of entrained drops of moisture from the air prior to its said venting,v means for silencing the air venting through said air outlet, and means for controlling said venting air at a geometric rate.

6. .in a device of the character described, a casing having an inlet, means to permit discharge oi air from said casing, said means comprising a body supported bysaid casing and having an outlet orifice provided with a valve seat at its inner end, and a top seating surface at its opposite end, a temperature controlled valve adapted to cooperate with said seat, and a member rotatably supportedon said body and having a bottom seating surface adapted to seat on said top seating surface of said body, said bottom seating surface being provided with a groove Whose width and depth increases progressively from one end and a slot-like continuation at the other end of said groove, both said groove and said slot-like continuation being concentric with respect to the axis of rotation of said member, and being movable over said orifice upon rotation of said member for controlling venting from said orifice at a geometric rate.

7. ln a device of the character described, a casing having an inlet, means to permit discharge of air from said casing, said means comprising a body supported in an opening in said casing and having an outlet orifice provided with a valve seat at one end and a top seating surface at its rotatably supportedon said rbodyi and' having a '-reentrant portion providedwith yai bottom seating n 'ssurface adapted toV seat Yoni said top seating vsuri'ace of said body, said fbottomifse'ating'surface being provided With a groove'whse 'width land depth* increase' progressively `from one end,- and a slot-like continuation at theother'end of' said 4groove `also :progressively:y increasing in' .,width, both said groove and'slote'like continuation being f concentric lwith respect-L to .the aXisof rotation of said mem-ber andi-movable' over said top seating-surface upon rotation'fof; said membensaid finember having, a .secondiportionldeilning Va silencing 'chainb'erf and' a passagewayvconnecting said ltwo portions of -said member, la locking member adapted to fit within saidfreentrantportion, said vlockingimemberhavirig a' reentrant chamber ,overlying'said passagewayl and said groove 'and slot-like `continuationy and serving as a conduit.-for air ventedthrughsaidV 'orice to @said passageway, saidtwo members operating in conjunction with saidbody for .silencing and vfor controlling? venting fromsaidfforifice Aat a geoinetric'ratef. v -f M8. Ina-device of thecharacter described, a casing. having' an inlet, means to permit discharge of `air from'said casing, said meansicompri'sing a -body supported inl arf opening-linfsaidcasing andina-ving an outlet orifice provided with a valveseat` at one end and a top seating surface at `its opposite end, altemperatureloperatedvalve Within' said 'fcasing cooper'ating jvvithfsaid valve seat,-I a' Vmodulator memberiilrotatablylsupported on saidv body, 'a `portion/of saidv lmodulator member defining a -sound fdeadening chamber with said casing, said"fmodulatr'-'-havinga portion rotatable over said orice,la',rid fsaid lastlnamed portion having a bottomseatiiigsurface movable oversaid top seating surface and provided with a combination groove a'ndzslot extension thereof both concentric1v with? respect 5totheaxis of rota# tion; ofsaid 'modulator and `atvl'iicl'i-. increase l in Width from a narrowest end of said groove at a geometric rate to a Widest portion at the end of said slot furthest from said groove, and both movable over said orifice upon rotation of said modulator to control venting from said orifice at a geometric rate, and means in conjunction with said modulator for leading vented rair to said chambensaid first-named portion of said modulator being arranged with respect to said casing to permit discharge of vented air from said cham,-

ber.

9. In a device of the character described, a. casing having an inlet, a body supported by said casing and having an outlet orifice provided with a valve seat at one end and a top seating surface at its opposite end, a valve within said casing cooperating with said seat, a moduiator member supported on said body, a portion of said modulator defining a sound deadening chamber with said casing, said modulator member having a portion rotatable over said orifice, and said lastnamed portion having a bottom seating surface movable over said top seating surface and provided With a combination groove and slot eX- tension thereof both concentric with respect to the axis of rotation of said modulator and which increase in width from a narrowest end of said groove at a geometric rate to a Widest portion at the end of said slot furthest from said groove, and both movable over said orifice upon rotation of said modulator to control venting from said CERTIFICATE OF CORRECTION.

November 9 19145 WA INWRIGHT TUTTLE nted specification It is hereby certified that error appears in the pri Page 5, first of the above numbered patent requiringv correction as follows:

57, for "and at II read --and at III; and that the Said co lumn, line same Letters Patent should be read. with this correction therein that the may conform to the record of the case in the Patent Office. signed and sealed this 11th day of January, A. D. 19ML.

Henry Van Arsdale Acting, Commissioner of Patents.

(Seal)

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