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1366- '17, 1946- J. A. HOFFMAN ETAL 2,412,685 CONDUIT COUPLING Filed April 22, 1944 2 Sheets-Sheet l m \llllmllllllll‘ 'IHI INVENTORS SAMUEL R. OLDHAM JAMES A. HOFFMAN WILGOT J. JAQOBSSON BY, ATTORNEY Dec. 17, 1946. J. A. HOFFMAN ETAL 2,412,685 CONDUIT COUPLING Filed April 22, 1944 2 Sheets-Sheet‘ 2 INVENTORS JAMES A. HOFFMAN SAMUEL R. OLDHAM WILGOT J. JACOBSSON BY ATTORNEY 12,412,585] Ratented Dec. 17, 1946 ‘UN/limo 1 STATES A PATE NT], OFFICE. 2,412,685 ‘ , ' coNnUrr COUPLING‘ James Arthur Hoffman, Roselle, Samuel _R. Oldham, West Orange, and Wilgo't J. J acobsson, Plain?cld, N. J., asslgnors to.vThe Linde Air Products Company, New York, N. .Y., a corpo ration of Ohio Application‘April 22, 1944, Serial No. 532,264 16 Claims. ' (Cl. 284-—19) 1 This invention relates to conduit couplings, and . the coupling units, e. g., the plug unit X. . An an more particularly to an improved conduit cou pling of the socket-and-plug pressure-sealed type especially adapted for readily connecting and‘ disconnecting a hose and a ?uid supply device. In conjunction with breathing equipment used on airplanes, for example, it is essentialthat the means for coupling every individual oxygen sup ply hose to the supply of oxygen under pressure shall be quickly attachable to the oxygen sup-' ply device and dependable to deliver the oxygen ' whenever it is needed; shall provide a seal with in the coupling that is reliable over a wide range of applied gas pressures and under widely vary’ ing temperatures; and shall not kink or twist the gas hose that delivers the oxygen for breathing. The principal object of this invention is to pro vide a conduit coupling which meets the fore nular tapered 0r frusto-conical free wall portion l2 adjacent the other end of thetubular sealing membrane or element S is arranged to engage and fit. an annular or conical internal seat l3 on the other coupling unit, e.’ g., the socket unit Y; the construction being such that the pressure of the ?uid such asoxygen ?owing through the coupling and into the resilient sea-ling element S will maintain a fluid-tight or sealed joint be tweenthe tubular sealing membrane YS and the annular seat l3 along their mutually contacting surfaces. - The annular seat l3 desirably is formed inter nally adjacent the end of a metal tube T consti tuting a part of one of the coupling units, e. g., the socket ‘unit Y; and, in order to prevent vdam age to the delicate sealing element S while con going requirements and yet is comparatively in necting or disconnecting the coupling units, the expensive to manufacture and install, and easy to 20 metal tube '1‘ in locked or secured against rota manipulate. These and other objects, and the tion about its axis and relatively to the sealing novel features of the invention, will become ap- 1 element S when the‘ latter engages the annular parent from the following description and the seat i 3. This locking function desirably is ac accompanying drawings in which: complished by cooperating positioning and in Fig. 1 is a central longitudinal sectional view of 25 terlocking means on the two conduit units, which means may consist of a pin l4 carried by one of this invention; I the units, e. g., the plug unit X, and a crown C Fig. 2 is an exploded view mainly in side ele comprising a circular row of spaced-apart ?ngers vation of the parts of the plug conduit unit of l5 secured to the other unit, e. g., the tube T, of a conduit coupling embodying the principles of such coupling; ‘ Fig. 3 is a view similar to Fig. 2, of the parts of the socket conduit unit shown in Fig. .1. Fig. 4 is a central longitudinal sectional view of a modi?cation of the invention. Fig. 5 is a cross-sectional view taken on line ’ 5-5 of Fig. 4; and 30 the socket unit Y, to provide a row of open-ended ' slots ii, any one of which may receive the pin [4 endwise therein when the units X and Y are tele scoped axially relatively to one another to con nect them together.’ To provide a readily connectible and discon nectible union, the two units X and Y desirably are additionally’ provided with pin-and-slot or Fig. 6 is a central longitudinal sectional view of another modi?cation, the units being shown par bayonet-type connecting means, manually opera tially uncoupled. ble with the aid of a spring G to releasably lock . Generally speaking, and referring to Figs. 1, 2 40 the units in telescoped relation, securing them and 3 which illustrate a preferred embodiment of the invention,‘ the, improved conduit coupling ' comprises a plug conduit unit X having one end thereof constructed so as to telescope axially into and. releasably interlock with a mating socket conduit unit Y, to provide‘ a ?uid passage through the coupling, which passage is effectively sealed against axial relative movement except against the force of said spring G. One of ‘the units, e. g., the plug unit, may be provided with two diametri cally opposite L-shaped slots‘ l‘l, either of‘ which receives a pin l8 carried by the other unit, ‘e. g., the socket unit. This pin l8 desirably is carried by a sleeve or ferrule F secured‘ but rotatable against ?uid leakage to the atmosphere. The relatively to the tube T. The sleeve F is ‘concen ?uid-pressure sealing means includes a substan trically connected to the exterior of the tube IT tially tubular or conical membranous element S, 50 intermediate the ends of the latter, as by an in desirably formed of anode rubber or ‘other suita turned ?ange IS on the ‘sleeve ?tting slidably ble elastic or resilient materiaL'which is arranged within a circumferentialgroove‘ 20 formed be coaxially within and has an annular ?ange l0‘ at tween an annular ‘?ange 2|“ on the tube T ‘and a one end thereof clamped in sealing contact with ring 22 secured to the ‘tube‘T by an outwardly an inner annular surface or‘ shoulder I I of one of 55 spun bead 23. Thus, the part of the tube T pro 9,419,885 . I \\\ 3 outside the sleeve. " ~ 4 I‘ ' spacer l0\,\presses the ?ange Ill against the shoul vided with the internal annular seat It is within the sleeve F and a part 24 of the tube projects der ll, while a cylindrical surface portion 44 of _ the shell B contacts with and holds these parts The external tube part 24 is designed to be lit into and non-rotatably secured to a hose H or radially in place. When the seat R, the spacer 40 and the ?ange III are thus clamped in position, all Joints between them and the casing sections A.and B are e?ectively sealed, and the valve seat R cooperates with both the lip 31 and the face the latter' may be turned about its axis inde 38 of the valved], to‘seal the chamber K when pendently of the tube and the hose both before and after the tube T is locked against rotary 10 the valve is closed. The bayonet slots H at the front,end of‘ the movement in sealing position with respect to the similar conduit; and, by virtue of the rotatable ‘ connection between the tube T and the sleeve F, plug unit may be formed in any suitable manner, as by turning down two stepped circumferential sections 45 and 43 on the exterior of the shell B sleeve is turned to position to interlock the pin 15 adjacent its front end‘ and .then providing such stepped sections with an interiorly reversely l8 thereon with-one of the bayonet slots H on stepped ring 41, the latter being secured iii-place the plug unit. against the inner shoulders 48 and 49 by spinning A normally-closed valve is included in one of outwardly the extreme end'portion of the shell to the conduit units and is constructed and arranged to be actuated and opened by the other conduit 20 overhang and engage the outer edge of stepped unit when the two units are coupled together. As , ring 41, as at 50. Before securing the stepped ring 41 in place, its rear edge is appropriately re shown, the plug unit X contains a disc-type valve cessed and notched at diametrically opposite sides V normally held by the coil spring G, assisted to provide the circumferentially extending por-' ‘by the ?uid pressure, against an annular valve ,seat R of suitable yieldable material, and a tubu 25 tions of the bayonet slots l1, and notches are cut from the front edge perpendicularly to the ‘lar valve stem E secured to the valve V extends recesses to provide the entrances of the bayonet axially through the coaxially arranged seat R sealing elements in'the plug unit. Thus, damage to the sealing element S and also kinking or , twisting of the hose H is prevented when the andsealing element S, so that the free annular slots l‘l.v The pin l4, which cooperates with the ?ngers l5 and slots iii of the socket unit Y to lo end 25 of the valve stem will be engageable by an internal annular shoulder 26 on the tube T, 30 cate and lock the coupling units in telescoped relation, may be secured to the shell B by rivet to push the valve V axially oil the seat R when ing its shank in a hole extending through the the units are coupled together. Thus ?uid may stepped section 46, so that the head of the pin. ?ow through four radial holes 21 provided in the l4 will be located in and be about the same height valve stem E adjacent the valve V, causing the application of ?uid pressure against the inside 35 as the increased diameter of a counterbore 5| in the‘ shell B. , , of the resilient sealing element S to provide a The tube T of the socket unit Y has a ?uid pas ?uid-tight seal between the conical end portion l2andthe seat l3. ' , sage 5la which has the same diameter as ?uid passage 52 through the tubular valve stem E, and The plug unit X desirably includes a two-piece generally tubular casing comprising a nipple ‘A 40 is coaxial therewith when the end 25 of the stem E engages the shoulder 26 to unseat the vatve V. and a shell B detachably connected together by The tapered internal seat I3 of the tube‘~'T is inter'fitting threads at 30, and hexagonal wrench formed'by counterboring the tube on a long taper heads are provided at 3| and 32 to aid in tightly to ?t an extended area of the outer substantially securing them together, to separate them. and to conical surface of the sealing element S. secure this- unit to a ?tting. The outer end of The locating and locking ?ngers .l5 and ‘slots the nipple A has an externally threaded boss 33 IS on the tube T may be provided by cutting the adapted rigidly to secure the plug unit to a ?uid longitudinal slots lengthwise into a tubular metal conduit, such as the internally threaded outlet piece C in such manner as to leave a circular row of an oxygen supply ?tting D; and a ?uid inlet passage 34 in the boss 33 opens into a valve cham 50 of spaced-apart arrow-shaped or pointed ?ngers l5 and also to leave a cylindrical band 53 clos ber K in the nipple. The valve centering and ing the inner .ends of the slots l6 and connecting closing spring G bears at one end against a shoul the ?ngers I5 together but in spaced relation to der 35 at the bottom of the chamber K, and its one another. This crown or ?nger-slot assembly other end ?ts around a boss 36 on the rear of the C is substantially the same thickness as the height valve and bears against the latter. ' of the head of the pin l4, and said assembly may The inner end of the nipple A has an axially ex be rigidly and non-rotatably staked-or secured tending annular lip or ?ange 31 arranged seal to the outside of the tube T by driving diametrié ingly to engage the annular valve seat It outside cally opposite projections 54 on ‘the band 53 into the area thereon that is engaged by an annular correspondingly located recesses 55 in the outer 60 seating face or edge 38 of the valve V. An annu lar spacer 40 composed of rigid material such as > I metal having substantially the same inside and ’ surface of the tube T. . The head of the pin ' l4 desirably is rounded or circular and, when telescopically coupling the outside diameters as the seat R, is located be units X and Y, ?rst engages the pointed end of tween the latter and the ?ange III of the sealing element S. The spacer 40 hasa ?ange or an 65 any one of the ?ngers ii to smoothly position the ' nular extension 4| at its inner edge which pro units circumferentially relatively to one another and to preliminarily non-rotatably lock the tube T relatively to the sealing element S in such Jects into the sealing element S and supports the latter internally. At least a part of the elastic manner that the sleeve F may be rotated, with sealing element S, which desirably is substantially of frusto-conical shape, engages and is externally 70 out rotating the tube T, to locate the head of supported by a smooth section or portion 42 of the interior surface of the shell B. When the nipple A and shell B are screwed together and in contact at 43, the lip 31 of the nipple presses into the seat It and, through the 75 pin [8 on the inside of the sleeve opposite the entrance of one of the bayonet slots l1. There upon,‘ the units may be telescoped into their ?nal I coupled position and the pin I4 pushed farther into the slot IS with which it has registered, 3,412,685. ‘ . is , after which the sleeve F may again be rotated independently of the tube T to seat the pin it s , , , , used without other features, (as. forexampiaa coupling without a valve may be constructed ac in the circumferential part of the bayonet slot - I‘ cording to this invention, or a valved coupling without the improved sealing means and seat ; ' which it entered to eifectively releasably lock the ' two units in coupled relation, the spring G coop erating to retain the units in such locked rela - tion. therefor may be constructed according tothis invention. While, in the couplings herein illus trated. the plug unit constitutes the ,?uid inlet The improved conduit couplings illustrated in and the socket unit constitutesethe ?uid outlet, Figs. 4, 5 and 6 also embody principles of this it will be understood that the principles of the invention and, except for the major differences 10 invention are equally applicable to a coupling to be described below. are structurally similar to wherein the valve V and its seat R as well as the the preferred form of coupling illustrated in Figs. sealing element 3 are located in thesocket unit 1, 2 and 3. and the seat I: is located in the plug unit, to In Figs. 4 and 6, respectively, the ends of tubu provide a coupling wherein ?uid enters through lar stems E’ and E" for unseating the valves 15 the socket unit and discharges through the plug V’ and V" are secured axially within the tubes unit. The couplings of the invention may be T’ and T" at 25-’. 26', and 25", 28"; and the used to conduct any ?uid under pressure, espe other ends of these stems E’ and E" engage cially gases such asv oxygen, air, acetylene or rare in grooves 60', 60" in the faces of the valves when unseating the latter. Short tubes ll’ and 20 II" near the valve seats R’ and R" are arranged > slidingly'to ‘engage the outer surfaces of the stems E’ and E", to guide the latter and pre vent damage to the sealing elements S’ and S" _by the stems E’ and E”. (3 Ci In Fig. 4, the tubular elastic ?uid-pressure seal ing element '8' has a cylindrical section 6| to fit the interior cylindrical surface 42’ ‘of smaller diameter than the surface ",to yieldingly hold the tubular part ll" in place and to provide in 30 creased sealing ‘area. In Fig. 6, the tubular elastic sealing element S" is shown as an annular channel facing the gases. ‘ ' What is claimed is: Y 1. A conduit coupling comprising, in combina tion, a socket conduit unit; a plug conduit unit readily attachable to and detachable from said socket unit; one of such units including a sub stantially tubular casing and a tubular elastic sealing element having one end thereof in sealing contact with the interior surface of said casing; the other of such units including a tube having an annular seat adapted to engage an annular portion adjacent the other end of said sealing element to provide a ?uid-tight joint between said sealing element and said tube when said socket unit is attached to said plug unit; saidv units having cooperating interlocking means op- ' tubular part-4i", to enclose a helical spring 62 that bears against and normally spreads apart 35 erable to prevent rotation of said tube relatively opposite annular limbs or ?anges 63 and 64 “of the element S". The limb 63 makes sealing contact with the shoulder 65 in the shell B", and the end 66 of the tube T” engages the limb' 6i and compresses the spring 62, to provide an effective ?uid-tight joint when the coupling units are telescoped together. I ‘ to said sealing element when the latter engages said seat. ‘ ~ ‘ 2. A conduit coupling comprising, in combina tion, a. substantially tubular casing; a tubular elastic sealing element in said casing; a tube hav ing an annular seat adapted to engage an annu lar portion of said sealing element to provide a In both Figs. 4 and 6', the means for locating and locking the tubes T’ and T" relatively to the sealing elements S’ and S" are reversed with respect to the corresponding locating and look ing means shown in Fig. 1; and the bayonet ?uid-tight joint; a. sleeve telescopically ?tting ?ngers 15' within a cylindrical piece 53’, secured around the front endof the shell B’. Similarly, elastic sealing element in said casing; an annu lar valve seat in said casing; a valve normally said casing and secured to and rotatable rela tively to said tube; cooperating means on said casing and said sleeve to couple said casing and said sleeve in telescopic relation andto' hold said seat against said sealing element; and means to connections of the sleeves F’ and F" to the shells prevent rotation of said tube relatively to said B’ and B" also are reversed with respect to the corresponding bayonet connection of Fig. 1. In’ 50 sealing element when the latter engages said seat. ‘ Fig. 4, the tube T’ has ‘diametrically opposite 3. A conduit‘coupling comprising, in combina pins H’, ll’ arranged to slide into any two di tion, a substantially tubular casing; a tubular ametrically opposite slots l6’, l6’ between pointed spring-pressed against said valve seat. and hav the tube T" carries diametrically opposite radi ing a tubular valve stem extending into said tubu ally projecting pins I4", l4" arranged to slide lar sealing element; a tube having an annular into any two diametrically opposite slots l6", surface adapted to engage an annular portion 16" between a row of spaced-apart pointed ?n gers l5" formed integral with the front end of v60 of said sealing element to- provide a ?uid-tight joint, and also having means adapted to engage the shell B". In both Figs. 4 and 6, respectively, said valve stem to‘ push said valve away from the shells B’ and B" carry diametrically oppo said valve seat and open said valve; a sleeve tele site radial pins l8’, l8‘ and l8", l8" arranged scopically ?tting, an exterior portion of said cas to engage in and cooperate with pairs of bayonet ing and secured to and rotatable relatively to said slots l1’ and I1" inthe sleeves F’ and F", to tube; pin-and-slot means onsaid casing, and saidv releasably lock the two units X’ Y’ and X" Y” in fully telescoped relation. sleeve to couple‘ said casing and said sleeve in telescopic relation and also to holdsaid tube in ‘ While several embodiments have been disclosed position to press said. annular surface against herein to illustrate the principles of this inven tion, it will be evident that numerouschanges in said sealing element and to open said. valve; and the details of construction and arrangement of longitudinally-interlocking, means on said‘ casing parts are possible without departing from the . and said tube to prevent rotation ‘of said ‘tube principles of the- invention or sacri?cing its ad relatively to said sealing element when said, an vantages. Furthermore, it .will be understood nular surface engages said sealing element- , I l that certain features of the invention may be 75 4. A conduit coupling unit comprising. in com 9,412,688 'bination, _a shell having an internal annular shoulder, a nipple>~removably secured in said relatively to said tubular ?uid pressure sealing membrane when said annular end portion en against relative rotary movement, pin\and slot operating longitudinally interlocking crown-and‘ means acting releasably to lock said units to gether, the parts of said units which are secured and locked by said means comprising a tubular ?uid-pressure sealing membrane composed of delicate resilient material carried by one unit, pin means to prevent rotation of said tube rela tively to said tubular ?uid-pressure sealing gages said annular seat, wherein said annular seat1 shell, said nipple having an axially projecting is provided by a tapered internal portion adja annular ?ange, a tubular ?uid pressure sealing element having an annular ?ange‘ at one end Cl cent the end of said tube within the plug unit. 11. A ?uid pressure-sealed type conduit cou seated on said annular shoulder, - an annular pling comprising, in combination, a plug conduit spacer, an annular valve seat, said valve seat and unit including an elongated tubular ?uid-pres spacer being disposed between the ?ange of said sure sealing membrane therein; a socket conduit sealing element and the ?ange of said nipple and secured in place in said shell thereby, a valve in 10 unit readily attachable to and detachable from said ‘plug unit, said socket unit including a tube said nipple, and a spring in said nipple urging extending into said plug unit and having an an said valve toward .said valve seat. nular seat within the plug unit engageable by 5. A ?uid pressure-sealed coupling comprising an annular end portion of said tubular ?uid-pres in‘ combination, a‘ planet conduit units, crown and pin means acting to secure parts of said units 15 sure sealing membrane; said units including co and a tubular seating member for said membrane membrane when‘ said annular end portion en gages said annular seat, wherein said annular seat isx'p‘rovided by the inner end of said tube within the plug unit. 12; A ?uid pressure-sealed type conduit cou pling comprising, in combination, one conduit arrangement of the combination ‘being such that ' \ said crown and pin means axially guide said units 25 unit including a tubular shell having on the in side thereof a threaded portion at one end, a and thereby prevent any relative rotary move first smooth surface portion, a shoulder facing ment between said tubular ?uid-pressure sealing carried by the other unit, the construction and membrane and said seating member when they are unlocked and uncoupled. ~ such ?rst smooth surface portion, a second smooth surface portion of lesser diameter than that or 6. A ?uid pressure-sealed coupling as de?ned‘ 30 such ?rst smooth surface portion, a third smooth " surface portion of greater diameter ‘than that by claim 5, in which said ?uid-pressure sealing membrane has a conical free wall portionadapt ed to form a ?uid-tight seal with a correspond ingly shaped’ seat on said seating member. 7. A ?uid pressure-sealed coupling as de?ned by claim 5, in which said ?uid-pressure sealing membrane has a cylindrical body portion and .iree'end portion, said portions both being adapt of such second smooth surface portion, and at ' the other end a fourth smooth surface portion of greater diameter than that of such third smooth surface portion, a conical'sealing element of resilient material having a ?ange seated on said, shoulder and a body portion ?tting'such second smooth surface portion, an annular spacer engaging such ?ange and said body portion, an ed to expand to form fluid-tight seals with cor respondingly shaped seats surrounding such por 40 annular valve seat of ?exible material mounted on said'spacer,.a nipple engaging the threaded tions' when said units are coupled together. portion of said tubular shell having an axially 8. A ?uid pressure-sealed coupling as de?ned projecting annular lip at one end engaging said by claim 5, in which said ?uid-pressure sealing valve seat, said nipple having a ?uid inlet at membrane is in the form of a cylinder having radially extending annular ?anges at each end, 45 the other end, an internal spring supporting shoulder, a spring chamber,‘ and a valve chamber, a helical springisurrounding such cylinder and a valve disposed in such valve chamber, a coiled yieldingly resisting axial compression of said spring in such spring chamber resting at one end ?uid-pressure sealing membrane as said units are on such spring supporting shoulder and urging coupled together. 9. Aconduit coupling comprising, in combina- , said valve toward said annular valve seat, and a tion, a plug conduit unit including a tubular tubular valve stem engaging said valve and ex ?uid-pressure sealing ‘membrane, therein; a socket conduit unit readily attachable to and de tending axially through both said annular valve seat and said conical sealing element, said stem tachable from said plug unit, said socket unit including a tube extending into said plug unit , and having an internal annular seat withina with said fluid inlet when said valve is spaced from said seat, and a second conduit unit includ ' bore of said tube in the plug unit and engageable by an external annular end portion of said tubu , ' having at least one radial hole communicating ing a tube and a rotary ferrule secured to said tube, said tube being adapted to 'bt' axially in- ‘ serted in the third smooth surface portion of said including cooperating means to prevent rotation 60 tubular shell, said tube having an internal con- . ical seat adapted to ?t the free end- portion of of said-tube-relatively to said tubular ?uid pres said conical sealing element when said tube is in ’ sure sealing membrane when said external annu serted axially into said shell, said tube having , la: end portion engages said internal annular ' lar ?uid-pressure sealing membrane; said units seat. . 10. A conduit coupling comprising, in eembl nation, a‘ plug conduit unit including an elon gated tubular ?uid-pressure sealing membrane therein; a socket conduit unit readily attachable to and detachable fromsaid plug unit, said socket unit including a tube extending into said plug unit and having an annular seat within the plug unit engageable by an annular end portion of said an internal annular _ shoulder axially engaging said tubular valve stem against the force of said spring with said valve spaced from said annular valve seat, coacting anti-rotary telescoping means associated with the fourth smooth surface of said shell and said tube for securing said tube and shell against any relative rotary movement to pro tect said sealing element by keeping said conical ‘seat from turning‘with respect thereto, and co acting locking means associated with said ferrule tubular ?uid-pressure sealing membrane: said units including cooperating longitudinally inter and said shell adapted with said spring to secure ' locking means to prevent rotation of said tube 75 said units axially together. 2,412,885 13. A ?uid pressure-sealed type conduit cou pling comprising, in combination, a plug conduit unit havingr a sealing member composed of anode rubber to provide a ?uid-tight joint and a socket unit having means cooperating with means on said plug unit and acting to positively secure parts of said units against relative rotary movement to prevent injury to said sealing member. 14. A fluid pressure-sealed type conduit cou pling comprising, in combination, a plug conduit unit including a tubular shell having on the in side of one end thereof a threaded portion, said 10 when said units are coupled; said shell being pro vided with means for quick connection with said ferrule to secure the units in coupled relation against the force of said spring. 15. A conduit coupling comprising, in combi nation, a socket conduit unit; a plug conduit unit readily attachable to and detachable from said socket unit; one of such units including a sub stantially tubular casing and a tubular elastic sealing element having one annular end thereof secured in sealing contact with the interior sur face of said casing; the other of such units in shell also having a shoulder facing said threaded cluding a tube having an internal annular seat portion, a tubular sealing element composed of within the bore of said tube, said internal seat anode rubber having a ?ange seated on said 15 being constructed and arranged to surround and shoulder, means engaging the ?ange of said seal engage an annular external surface portion ad ing element to provide a ?uid-tight joint, a valve jacent the other end of said sealing element to having a tubular valve stem extending into said provide a ?uid-tight joint between said sealing sealing element, said stem having at least one element and said tube when said units are cou radial opening adjacent said'valve, a spring urg 20 pled together; said units having cooperating in ing said valve toward closed position, a nipple terlocking means operable to prevent rotation of threaded into said shell and engaging said spring said tube relatively to said sealing element when and permitting unrestricted fluid flow when the said internal seat in said tube engages said ex valve is open, and a socket unit including a tube ternal surface portion of said sealing element. and a rotary ferrule secured to said tube, said 16. A conduit coupling as claimed in claim 15, tube being adapted to be axially inserted into wherein a normally-closed valve is disposed within said tubular shell to provide an annular ?uid one of said units, and a tubular stem for actu sealing contact with the free annular end portion ating said valve extends axially through said of said sealing element, and said tube also hav tubular sealing element and axially into the bore ing an internal shoulder for engaging and mov 30 of said tube. ing said tubular valve stem against the force of JAMES ARTHUR HOFFMAN. said spring to open said valve to permit unre SAMUEL R. OLDHAM. stricted ?uid ?ow through said radial opening WILGOT J. JACOBSSON.