Abstract: A connecting device is provided particularly as a quick-connect device for connecting fluid channels on motor vehicles. The connecting device features two axial connecting elements that are to be clamped and that are sealed by a sealing element to be deformed in the axial direction. The deformation of the sealing element is limited by mechanical stop means (support surfaces). A wedge-clamping device is used for clamping the connecting elements against each other.

Abstract: A connection between a fluid conduit and an air flow port mounted on an air flow device includes a housing having a through bore which receives a flange on an end form of the conduit. One end of the port is disposed in the bore in the housing in sealed engagement with the end form. A transverse bore in the housing receives a retainer to lock the port in the housing preventing axial separation of the port from the conduit.

Abstract: A quick connector for connecting fluid lines includes a first connector having a housing for receiving a tube carrying spool. The spool sealingly engages an endform on the tube to form a metal-to-metal seal. A retainer in the form of ring having a plurality of angularly and radially extending, resilient legs extending therefrom and terminating in end pads is mountable in the housing in engagement with the spool with the end pads disposed in an annular, inward facing channel in the housing. A pop top is slidable along the tube to bias the retainer legs radially inward to allow insertion of the retainer into the bore in the housing and then is removed to allow the legs to snap radially outward bringing the end pads into engagement with housing channel. An assurance clip is mountable interiorly between the legs of the retainer and the spool to maintain the retainer legs in a radially outward position in engagement with the channel in the housing.

Abstract: A quick connector includes a male component in the form of a spool fixedly mounted to a fluid conduit and a female component in the form of a housing having a bore open at one end for receiving the male component therein. A latch is rotatably mountable on the spool and is movable relative to a transverse channel in the female component between a first installed position with respect to the channel and a second latched position wherein the latch engages opposed notches in the channel to latch the spool in the housing. At least one latch clip is mountable on the latch and engageable with edges of the channel in the body to resist rotation of the latch from the latched position. An optional secondary latch clip is engageable with the latch clip, the latch and the opposed side edges of the channel to further resist rotation of the latch from the latched position.

Abstract: A release tool for a quick connector with a radially displaceable retainer has a pair of arms extending from a collar which are normally disposed on axially extending surfaces of the housing of the female component of the quick connector when the release tool is mounted on the housing. A retainer engaging surface on each of the arms is movably engageable with projections on side legs of the retainer to urge the projections and the end portions of the side legs of the retainer radially inward to a position where the projections are disengaged from lock edges on the axially extending surfaces of the housing to allow disengagement of the retainer element from the male component of the quick connector.

Abstract: A spring system for connecting two flanges (13, 14), for use especially in a motor vehicle exhaust system. The spring system is configured as an elastic, flexible clamp with functionally first (1, 2) and second (4, 5) U-shaped clamping jaws positioned opposite each other. This provides a spring system which is easy to assemble and economical to produce. To this end the spring system has the U-shaped arms (6, 7) of the clamping jaws (1, 2; 4, 5) having only locally very restricted areas (8, 9, 10) for direct application to the pieces (11, 13; 12, 14) to be joined by means of the clamp. Four application areas (8) exercising both clamping functions are present in at least one of the clamping planes (100 or 200), of which two areas are arranged in pairs and situate diametrically opposite each other.

Abstract: A positive connection between a pipe and a ring inserted into the pipe, in particular between the housing of a ram boring device and a stop ring inserted into the housing, wherein the inside wall of the pipe has a convex groove consisting of a section of a surface of a sphere and the ring has a corresponding convex outer surface with the same radius, the inside wall of the pipe possessing at least one axial groove permitting insertion into the pipe or the outer surface of the ring possessing at least one flattened portion permitting insertion into the pipe, or the ring being axially divided into two or more preferably unequal segments.

Abstract: A one-piece quick connector includes a tubular member and a collar. A pair of diametrically opposed actuating arms depend from the collar and lie in a first plane. A pair of diametrically opposed locking arms depend from the collar and lie in a second plane that is orthogonal to the first plane. The locking arms are disposed to engage a lip on the end of a conduit and are movable between a locking position and an unlocking position in response to movement of the actuating arms.

Abstract: A rotation connector includes a first connecting member provided with a female joint section defining an insertion recess and a ball locking groove, a second connecting member provided with a male joint section rotatably secured in the insertion recess and defining a ball receiving groove aligning with the ball locking groove, a plurality of rolling balls each mounted in the ball locking groove, and an elastic cushion secured in the ball receiving groove and urged on the rolling balls.

Abstract: A plastic fitting for plastic tubing is disclosed. The plastic fitting comprises a main body (10) having a tip sleeve (16) at one end of and an externally threaded portion (14) at the other end thereof, a cylindrical cap nut (20, 52, 64) threadedly attachable to the main body (10) in a manner to compress a flared end (36) of the plastic tubing down against the tip sleeve (16) of the main body, and a resiliently deformable split ring (30, 42, 60) that resides within an annular internal recess (28, 50, 72) in the cap nut (20, 52, 64) for retaining the flared end (36) of the plastic tubing in position around the main body tip sleeve (16). The resiliently deformable split ring (30, 42, 60) includes a plurality of inwardly facing bosses (38, 46) that cooperate with respective spaced apertures (40) formed in the plastic tubing flared end (36).

Abstract: A pipe coupling for a female screw to be connected to a female screw port formed in a fluid device, comprising a cylindrical main body. The main body includes a plurality of arm members having a male crew portion at a distal end to be connected to the female screw port. Also, the main body comprises a sliding member that slides from a close to an open position with respect to the arms members. The main body is provided with a lock member for stopping the movement of the sliding member.

Abstract: A quick-connect coupling for non-rotatably connecting a hose to a male stem member is made of plastic and in accordance with a first embodiment includes a plastic fitting body on which is mounted a plastic annular cap having depending lugs. The cap is welded or otherwise fixed to the end of the fitting body. A collet is slid into the annular cap. The collet has depending arms which nest between the lugs on the annular cap so that the collet does not rotate. Detents on the arms seat in a groove on the male stem member to retain the stem member within the fitting body. In accordance with a second embodiment, the fitting body is in the form of a unitary female member which utilizes a substantially C-shaped resilient detent inserted radially through a slot in the female member to retain the male stem member therein by seating in a circumferential groove in the male stem member.

Abstract: A quick coupling for hoses or pipelines with a coupling sleeve (1), a plug-in nipple (3) and a sealing element (21) is proposed, in which the sealing element (21) is tensioned in the locked state and/or has a rectangular cross section so that the tightness and the diffusion resistance of the quick coupling according to the invention are improved.

Abstract: A pipe joint assembly includes a cylindrical pipe and a pipe element having a generally cylindrical terminal portion for receiving the end of the pipe. The terminal portion is formed with a roughly straight open ended channel extending in a direction tangential to, but intersecting, the cylindrical pipe. A lock pin is insertable along the open ended channel so as to cause local inward deformation of the end, thereby locking the end and the pipe element together. The lock pin has a parallel-sided shaft portion of minimum transverse dimension d and a tapered portion of length l tapering to a point, where l is no less than twice d and is no greater than four times d. This geometry facilitates insertion of the lock pin through a combined linear and rotational displacement which is highly effective for ensuring effecting and reliable interconnection.

Abstract: A power steering apparatus (10) includes a conduit (50) through which a flow of power steering fluid is conducted and a housing (22) having a chamber (25) which holds power steering fluid. A connector assembly (60) connects the conduit (50) with the housing (22). The connector assembly (60) includes a base (64) which is fixedly connected with the housing (22) and a clip (66) which interconnects the base and the conduit (50). The clip (66) has a pilot portion (76) with cam surfaces (88 and 90) which engage a projection (68) on the conduit (50) to press the conduit into an opening (78) in the base (64) during connection of the conduit with the base. The clip (66) has a retainer portion (74) which cooperates with the base (64) and the projection (68) on the conduit (50) to compress a seal (70) between the projection on the conduit and the base when the conduit is connected with the housing (22).

Abstract: The invention relates to a device (1) for distributing fluid under pressure, particularly welding gas, comprising at least one body (1′) provided with at least one manometer (3, 3′) comprising a housing (4) and a connection ferrule (2, 2′), said connection ferrule (2, 2′) being inserted in a recess (5, 5′) provided in the body (1′), characterized in that said body (1′) comprises moreover at least one passage (6, 16) communicating with said recess (5, 51), and in that said connection ferrule (2, 2′) comprises at least one recess (7, 71) and in that at least one connection means (8, 18) is inserted in at least one portion of at least one passage (6, 16) of the body (1′) and in at least one portion of at-least one recess (7, 7′) of the connection ferrule (2, 21), so as to permit the solidarization, at least temporarily, of said manometer (3, 3′) on said body (1′).

Abstract: The present invention provides a pipe joint including: a socket mounted to a fluid pressure device; a joint main body to which a tube is connected; a stud having a base end portion connected to the joint main body and a tip end portion that can be connected to the socket; and an elastic clip for locking the stud and the socket in a connected state, in which the clip has a pair of paired members which extend in parallel with each other and can be opened and closed elastically and an operating portion for opening and closing the paired members, the socket has a pair of clip housing grooves into which the pair of paired members of the clip are fitted, and the stud has a tapered face for elastically spreading the paired members of the clip in the housing grooves as the stud is inserted into the socket and a locking groove into which the paired members of the clip are fitted and locked.

Abstract: The present invention includes a pre-assembled, high-pressure coupling interface adapter for use with a non-threaded port of a female member. The adapter comprises a generally cylindrically shaped metal body including a central longitudinal channel and an inner and outer surface. The body includes an external segment having an external end and an internal segment having an internal end, the internal segment configured for receipt within the port of the female member. The inner surface of the body is configured to engage and secure one or more external features of a separate male coupling member. The present invention also includes a coupling assembly including a coupling adapter and a method for forming a female coupling assembly including an adapter.

Abstract: This present invention provides a device for retaining an inflator within an air bag module housing in a sealing manner. In a first embodiment, the device comprises an inflator seal member and an inflator seal retainer. The inflator seal member is disposed about an outer surface of the inflator by disposing the inflator through a central opening formed in the inflator seal member. The inflator seal member further has a flange which is received within a retaining groove formed in the module housing for partially locating the inflator within an internal cavity formed in the module housing. The inflator seal retainer is designed to provide high quality seal retention between the inflator and the module housing. In a broad sense, the inflator seal retainer comprises a symmetric star shaped member having spring-like properties. The inflator seal retainer is formed so that it includes a plurality of peaks radially disposed about an opening defined by the inflator seal retainer.

Abstract: A pressure medium system, particularly a hydraulic system, which includes at least one working cylinder (pressure medium cylinder) and at least one pressure medium line for the supply and/or discharge of the pressure medium whereby assembly and disassembly is made possible, especially in vehicles, without great (manufacturing) efforts and by economic production by using a detachable retaining clamp (6) which grasps the outside of a pressure medium coupling (3) and an end piece (5) of the pressure medium line (4), which may be inserted into the pressure medium coupling (3).

Abstract: Mechanical pipe connections are provided by this invention which include the feature of coupler recesses with discontinuous locking grooves on the pipes. The interlocking system may also include male and female portions which mechanically mesh together to form binding contact between the pipes to reduce the individual rotation of the pipes relative to one another.

Abstract: A spline for joining irrigation tubing includes an elongated body portion. The body is configured to be inserted into and substantially fill a channel formed by aligning an interior channel in a female tubing end and a corresponding exterior channel in a male end. One or more serrations or slots in the body facilitate bending the body into annular channels. The end of the body is tapered to facilitate its insertion, including a taper along its length (such as on the side opposite the serrations), and a gripping portion on the spline further facilitates insertion and removal. Related methods are disclosed.

Abstract: An air brush type sprayer includes a can with a base extending from the can and a liquid outlet member is threadedly connected to a top of the base. A tube connected between an interior of the can and the liquid outlet member. A nozzle assembly is connected to a compressor and a nozzle and a connection part both extend from the nozzle assembly. The connection part is snapped to the base so that the gap is easily adjusted by rotating the liquid outlet member.

Abstract: A synthetic resin pipe with a joint, includes a first pipe end portion to be connected, having an open guide cylinder, a large-diameter cylindrical portion formed in a deep portion thereof continuous with the open guide cylinder and having a diameter larger than front and rear walls extending in an axial direction of the synthetic resin pipe, and an outwardly facing projection disposed in a portion of the large-diameter cylindrical portion. A separately produced engaging ring including an inclined guide surface, having a large inside diameter on a width-direction one end face side thereof and having a small inside diameter on a deep side thereof, the engaging ring further including a securing stepped portion formed on the deep side thereof, a plurality of cut-out portions, respectively formed by cutting out the inclined surface, and a projection projecting from a portion of the outer peripheral surface of the engaging ring.

Abstract: A washdown system with a hose, nozzle fitting and water supply connection assembly. The hose includes a generally helical central portion and end portions extending generally axially from the central portion. The water supply connection assembly may include female and male portions. The male portion connects to a water supply fitting. When connected to the female portion, the male portion can be swiveled substantially 360°. The female portion may include a quick-disconnect assembly to reversibly couple the male portion.

Abstract: The disclosure relates to a molded plastics tubular coupling comprising a plastics sleeve having an integral head at one end. The sleeve provides a cylindrical outer surface to engage in a corresponding bore of another component. The surface has an encircling annular recess and an integral radially extending flexible annular diaphragm formed in the recess. The diaphragm has an outer periphery extending proud of the cylindrical surface to engage and grip the corresponding surface of another component.

Abstract: The invention provides a one-piece flex pipe connection that has a bend, and any angle to a termination of a thread, groove or a 360° swivel flange. Additionally the invention provides a flex pipe coupling with a bend and with one end having a groove clamp connection and the other having a thread, groove or the 360° flange swivel. The last piece is a 360° bend swivel to a thread, groove or a 360° flange swivel. A preferred flex pipe coupling apparatus has a connector body with angularly related ends and with a central portion between the ends. At least one of the ends has a cylindrical recess. A shoulder at an axial end of the recess near the central portion cooperates with an end of a flex pipe inserted in the recess. An annular seal receiver in the cylindrical recess near the shoulder holds a resilient seal for sealing the end of the flex pipe.

Abstract: A novel hose coupling for a liquid transfer system is provided. The coupling comprises a connector portion adapted to lockingly engage an adapter on a receptacle, such as a gas tank, and a handle portion. The handle is proximate to a releasing member which is oriented for manipulation by a hand holding the handle. The releasing member is moveable between a first engaged position in which the coupling is lockingly engaged with a receptacle adapter and a second disengaged position in which the coupling is released from locking engagement with the adapter. Accordingly, the coupling is disengaged from locking engagement with the adapter when the release member is displaced from the engaged position to the disengaged position. The coupling allows one-handed, ambidextrous use, providing a coupling operator with greater maneouverability which is advantageous particularly in instances where receptacle access is limited.

Abstract: A pipe fitting includes a slider disposed in an insertion hole of a main body so as to be axially moved and includes a pressed portion which a falling-off preventing flange of a pipe abuts so that the slider is pressed axially when the pipe is inserted into the insertion hole. A fitting checker includes a pair of spreading legs having respective claws, the fitting checker being detachably attached to the main body so that the legs hold the main body. The claws engage the body and the slider so that the fitting checker is not allowed to be detached from the body when the legs are closed. The legs are spread so as to release the claws from engagement with the body and the slider so that the fitting checker is allowed to be detached from the body. Releasing protrusions are formed to protrude from inside portions of the legs of the fitting checker, the releasing protrusions being pressed so that the legs are elastically deformed in respective opening directions.

Abstract: A quick connector includes a housing assembly for receiving one end of a conduit with an enlarged annular flange and a retainer for locking the conduit in the housing assembly. The housing assembly includes first and second housings which are rotatably and non-axially displaceably interconnected. A rigid top hat is fixedly mounted in the bore in the first housing to prevent axial displacement of the first and second housings. An annular recess in the top hat receives the flange on the conduit. The housings can also be incrementally indexable ribs on a stem of one housing fixedly and non-rotatingly engage an inner surface of a flexible conduit.

Abstract: A coupling assembly for conduit or pipe comprising a first coupling member, a second coupling member and a locking member. The first coupling member is optionally a tubular component and the second coupling member or coupler is optionally a belled component. The present invention is also optionally provided with an annular sealing member.

Abstract: The invention relates to a detachable rapid-action coupling device designed to receive a tubular plug-in element (3) having a circular retaining rib (4). Said device comprises a receiving housing (1) having a cylindrical receiving space (6) for introducing the plug-in element (3) and a separate retaining element (2) made of hard-elastic plastic material and having elastically expandable retaining edges (17) facing inwards in the shape of an arc of a circle, which edges serve to engage the retaining rib (4) from behind after the plug-in element (3) has been introduced. The retaining element (2) can be pushed in from the outside in an opening (11) of the housing wall (5) to release the plug-in element (3). The receiving space (6) consists of three stepped sections. The housing (1) is embodied as a two-part structure. In order to move the opening (11) for pushing in and releasing the retaining element (2) into a better position, if necessary, when only limited space is available.

Abstract: A conduit mounting device for entrapping a conduit that includes a body having a U-shaped channel formed longitudinally through the body. The U-shaped channel receives the conduit therethrough and defines a leg on either side of the U-shaped channel. A retainer insert is mounted transversely in the U-shaped channel to sandwich the conduit between the retainer insert and the body in the U-shaped channel. The legs of the body are folded behind the retainer insert in the U-shaped channel to transversely entrap the retainer insert and conduit in the U-shaped channel. A device for further longitudinally retaining the retainer insert within the U-shaped channel, in addition to a device for rotatably locking the conduit within the U-shaped channel, may also be provided.

Abstract: A coupling assembly for conduit or pipe comprising a first coupling member, a second coupling member and a locking member. The first coupling member is optionally a tubular component and the second coupling member or coupler is optionally a belled component. The present invention is also optionally provided with an annular sealing member.

Abstract: Liquid dispensing apparatus having a pressure loaded quick disconnect assembly. The apparatus includes a first liquid containing component having at least one liquid passage, a second liquid containing component including at least one liquid passage, a movable connecting member having portions contained in the passages of the first and second liquid containing components, and a force transmitting member connected with the movable connecting member. The force transmitting member directs force against the first liquid containing component when the liquid passages of the first and second liquid containing components contain the pressurized liquid. This securely connects the first and second liquid containing components together using force generated by the internal pressurized liquid. When the pressure is removed, the force transmitting member may be quickly removed to disconnect the components.

Abstract: The invention relates to a quick release coupling device comprising an annular groove (4) formed on the inner face of one of the hollow bodies, a projecting part (6) formed on the other hollow body (2) and a force transmitting member (5) engaged with the groove and the projecting part (6). A shoulder (23) is provided for fixing the force transmitting member (5) to hinder the loosening of the coupling under loading. The inventive device is advantageous in that its design and use are straightforward while meeting the requirements related to safety and ease of cleaning.

Abstract: An insert coupling for connecting a flexible pipe section to another part comprises a housing with a first cylindrical bore, a sealing ring, which is effective between the flexible pipe section and the cylindrical bore, a clamping bush with a cylindrical inner surface, which in the region near the insertion side is followed by a conical part, and a clamping ring, accommodated in the clamping bush and provided with at least one radially inward projecting tooth. The conical part of the clamping bush by way of the clamping ring exerts a clamping force on the flexible pipe section when a load occurs on the flexible pipe section in the axial direction towards the insertion side. The clamping ring is formed as a ring cut through substantially in the axial direction at one point.

Abstract: A temperature resistant after incident clip is engageable with a retainer and mountable along with the retainer over a male component only when the male component is fully inserted into a bore in a female component. The clip is the form of a one-piece metal body having first and second spaced legs interconnected by an end wall and mountable about the male component. First and second arms project from the end wall and are engageable with a post on a retainer and lockingly mount the after incident clip on the retainer.

Abstract: A detachable hose coupling having improved interlocking U-shaped staple includes a female sleeve piece, a male piece of a size and configuration to permit insertion into the female sleeve piece, and a generally U-shaped staple having a cross-section with a peripheral surface which includes at least one radially recessed surface portion to permit a predetermined amount of fluid flow thereby when inserted into the male—female coupling.

Abstract: A device on a conduit end for joining the conduit (1) to a coupling (4) or some other receiver of the end of the conduit, which is made of aluminum or an aluminum alloy. Two external annular beads (2, 2′) are pressed out from the conduit wall on the conduit end and accommodate between themselves an O-ring (3). In an arrangement for joining, the receiver (4) has a conical inlet and means, which together with the rear annular bead (2) form engaging means for a tightening means.

Abstract: A quick-connect coupling for hoses or pipes with a coupling housing contains a connection piece and a housing part as well as a plug-type fitting wherein the housing part and the connection piece are realized in the form of two parts.

Abstract: A tube to be connected to a pipe is formed of a base portion, a wide portion and a narrow portion integrally molded together. The wide portion has an inner end extending to the base portion, and an opening formed at a side opposite to the inner end. An inner diameter of the wide portion is greater than that of the base portion. When the pipe is inserted, the base portion receives an insertion portion of the pipe, while the wide portion receives a projecting portion of the pipe therein. The narrow portion deformably projects inwardly from an inner circumference of the wide portion at a position away from the inner end. The narrower portion allows the projecting portion to pass therethrough in a pipe inserting direction by deformation thereof, and prevents the projecting portion from passing therethrough in a pipe removing direction opposite to the pipe inserting direction.

Abstract: A tube/casting assembly and method according to which an axially-projecting cylindrical flange projects from one end of a tubular casting over which an end portion of the conduit extends. A groove is formed in the casting for receiving the end portion and a retainer secures the end portion of the conduit in the groove.

Abstract: A plug-in coupling for systems involving pressurized media, where the coupling consists of two connector parts, a housing part (2) and a connector part (4). The connector part (4) can be inserted into a receiving opening (8) of the housing part (2), while it is being sealed, and when it is in a plugged-in condition, it can be locked in place and prevented from being released by means of a locking device (10). The locking device (10) includes a retaining element (12), which is supported on one side of one of the coupling parts, and which retaining element engages—while in the assembled state—a retaining groove (16) of the other coupling part by means of a form-fit or a form- and friction-fit.

Abstract: A device on a conduit end for joining the conduit (1) to a coupling (4) or some other receiver of the end of the conduit, which is made of aluminium or an aluminium alloy. Two external annular beads (2, 2′) are pressed out from the conduit wall on the conduit end and accommodate between themselves an O ring (3). In an arrangement for joining, the receiver (4) has a conical inlet and means, which together with the rear annular bead (2) form engaging means for a tightening means.

Abstract: A coupling device has a female part secured to a rigid endpiece. A stepped bore is provided that presents a large diameter section beyond an axial latch that is movable between two positions. A banding ring is housed in a removable manner inside the large diameter section and fitted on its inside surface with at least one retaining projection. The projection is used to axially link the tube to the banding ring by biting into the outside surface of the tube. An axial latch has two positions: one opposing axial displacement of the banding ring away from the rigid endpiece, the other releasing the banding ring.

Abstract: A twist pin for securing an outer cylindrical sleeve to an inner member concentrically received within the sleeve. The twist pin includes a first leg terminating at a first end and defining a longitudinal leg axis. A second leg extends downwardly from the first leg and extends more than 180 degrees around the outer circumference of the sleeve. The second leg passes below the leg axis proximate the first end at a crossover and terminates at a second end. A locking portion includes a protuberance extending inwardly toward the sleeve. The protuberance includes a bearing surface for contacting the sleeve and which is positioned below the first leg intermediate the crossover and the second end.

Abstract: A plug-in connector, especially for hose connections and for use in motor vehicles, including a receptacle and a plug. The receptacle may be provided with an insertion opening for receiving the plug and a groove for retaining at least one locking spring which may be used to lock the receptacle and plug together. The locking spring may include at least one locking section and one unlocking section which can be actuated from the outside of the receptacle. The receptacle may also include an unlocking opening accessible from outside of the receptacle and which discharges into the groove so that the unlocking section of the unlocking spring may extends from the groove into the unlocking opening. The locking spring is retained in the groove in a manner that the locking section is moved outward in a substantially radial direction into the groove when a force is applied to the unlocking section, thus disengaging the locking section from the plug and allowing separation of the plug and the receptacle.

Abstract: A single bolt coupling for the attachment to the end portion of a pipe having a circumferential groove or shoulder in such end portion includes a coupling which receives the end portion of the pipe therein and a circumferential open ended resilient ring associated with the coupling body which expands to allow passage of the groove into or out of the coupling and contracts to hold the groove in the coupling. The coupling is provided with a screw vise mechanism to expand the ring so that a pipe end can easily be inserted into the coupling. After insertion, the ring is allowed to contract to hold the pipe in the coupling. The coupling with its ring can also couple plain ended pipes, the ring contracting tightly around the pipe to hold it in place by friction between the pipe and ring.

Abstract: In the system described for connecting a valve unit for gas water-heaters to a tank of the water-heater, a probe belonging to the valve unit is housed in the tank in a leaktight manner. The system comprises a first element belonging to the valve unit and/or fixed thereto, a second element which projects from the tank and can be housed in a seat of the first element, the second element constituting a support and/or cover for the probe and having an outer surface in which there is a transverse groove, and a third element which is restrained axially on the first element and at least a portion of which extends in the seat in an arrangement such as to engage the groove when the second element is housed in the seat so as to clamp the first and second elements to one another axially, the third element being resiliently deformable between a first position in which the said portion projects into the seat and a second position in which the said portion is outside the seat in order to release the groove.