Abstract: A device for a computing system is disclosed. The device includes a body, a socket, and a connector. The body includes a panel and an internal conduit. The connector extends from the panel. The connector is removably coupled to the socket. The connector includes an outer end and an inner end. The connector also includes a nut that has an exterior surface mating with a corresponding interior surface of the socket, and a tubular inlet. The connector also has a sleeve with an internal bore and an external surface abutting the tubular inlet of the nut. The internal conduit is coupled to the inner end of the connector to circulate cooling liquid through the body. The nut includes an angled portion and the sleeve includes a flared portion for assisting in securing the nut and the sleeve in the internal conduit.

Abstract: Tubing retainers use with sensors, sensing systems including the tubing retainers, and methods of using the tubing retainers and sensing systems are disclosed.

Abstract: Tubing retainers use with sensors, sensing systems including the tubing retainers, and methods of using the tubing retainers and sensing systems are disclosed.

Abstract: A metallic connection with a metal pipe, with a base body made of metal, with at least one supporting body made of metal and formed in one piece with the base body for insertion into a pipe end and with at least one pressing sleeve made of metal and connected to the base body for receiving the pipe end, the supporting body and the pressing sleeve being designed for radial pressing, the supporting body having a first sealing section arranged at the distal end with at least one radially encircling sealing tooth has a holding region adjoining the first sealing section in the axial direction, holding teeth which are distributed around the circumference and extend axially, and a second sealing section adjoining the holding region in the axial direction and having at least one radially extending sealing tooth.

Abstract: A shaft-hub connection including a hub element and a shaft element is provided. The hub element includes a hub. The shaft element includes at least one first elongated region arranged in at least one second elongated region of the hub and is at least rotationally fixed to the hub element by way of a longitudinal press-fit including the elongated regions. The longitudinal press-fit has at least one first excess region with a first excess, and at least one second excess region, following the first excess region in the circumferential direction of the shaft element, with a second excess that is smaller than the first excess.

Abstract: Techniques for implementing and/or installing a system including pipe segment tubing and a swaged pipe fitting secured to the pipe segment tubing. The pipe segment tubing includes a carcass layer, an internal pressure sheath layer disposed around the carcass layer, a reinforcement layer disposed around the internal pressure sheath layer, and an outer sheath layer disposed around the reinforcement layer. The swaged pipe fitting includes a fitting body that defines a bore, an internal pressure sheath seal that seals the internal pressure sheath layer of the pipe segment tubing within the swaged pipe fitting, and a fitting jacket secured to the fitting body, in which the fitting jacket is conformally deformed around the pipe segment tubing to anchor the reinforcement layer of the pipe segment tubing in the swaged pipe fitting.

Abstract: A press fitting for pipes includes a socket with an insert opening for a pipe end. An annular groove-shaped space present in a press wall part of a press region is delimited by a limitation edge. A gripping ring is placed in the groove-shaped space. The press region is deformable from a non-compressed state a compressed state by a radially inward directed pressing action causing the press wall part to radially compress and the gripping ring to grip the pipe end. A check ring is provided which has one or more break segments and a coupling part. The break segments can be forced to break free by the pressing action, while the coupling part then comes to lie visible at least partly in between the limitation edge and the pipe end.

Abstract: A fluid connector comprising a body having a through-bore, a plurality of radially inwardly facing surfaces comprising a first cylindrical surface having a first diameter, a frusto-conical surface adjacent the first cylindrical surface, and a second cylindrical surface adjacent the frusto-conical surface, the second cylindrical surface having a second diameter, wherein the frusto-conical surface is arranged between the first and second cylindrical surfaces, and a plurality of outwardly facing surfaces comprising a first cylindrical surface having a first diameter, and a second cylindrical surface adjacent the first cylindrical surface, the second cylindrical surface having a second diameter, and a deformable tab integrally connected to the body and extending axially from the body.

Abstract: A crimp connection fitting includes a socket with at least one annular recess axially spaced from an annular O-ring receiving groove. The recess includes a plurality of axially spaced crimping elements such that, when the socket is crimped, it grips a conduit positioned within the socket. The crimping elements preferably are split ring spring clips. In some embodiments, multiple spaced recesses support one or more crimping elements.

Abstract: Secret information, such as seeds, codes, and keys, can be automatically renegotiated between at least one sender and at least one recipient. Various mechanisms, such as counters, events, or challenges, can be used to trigger automatic renegotiations through various requests or communications. These changes can cause the current secret information to diverge from older copies of the secret information that might have been obtained by unintended third parties. In some embodiments, a secret can be configured to “decay” over time, or have small changes periodically introduced that can be determined to be valid by an authorized party, but can reduce the effectiveness of prior versions of the secret information.

Abstract: A drywall mud applicator wheelless control tube is provided. The drywall mud applicator wheelless control tube has a plastic component (in an embodiment) having a rubber o-ring or spring which provides pressure to a slanted cylindrical ledge protrusion which allows the control tube to slide up and down a main mud applicator tube without the need for wheels on the control tube. As a result, the wheelless control tube increases the sliding and smoothness of the control tube as it slides over the main mud applicator tube.

Abstract: A heat pipe and a sealing method thereof; the sealing method for a heat pipe includes the steps of: providing a metal pipe member, the metal pipe member including one end having a sealed end portion formed thereon and another end thereof having a narrowing neck section extended therefrom. The narrowing neck section includes a channel. A compression mold compresses the narrowing neck section and moves away from the metal pipe member in order to compress and elongate the narrowing neck section into a compression elongated column and to seal the channel. Finally, spot welding process is performed on the compression elongated column to form a sealed block thereon. The present invention is of the merits of improved work efficiency for heat pipe bending, compression and testing and increased length of the metal pipe member with enhanced thermal transfer performance of the heat pipe.

Abstract: Provided are an authentication system and a method of operating the authentication system. The authentication system allows network cameras to authenticate an image storage device as a client. The authentication system includes an authentication preprocessing unit provided in the client to calculate and store an offset time representing a difference between time information of the client and time information that is received from a network camera in response to a time information request to the network camera, and an authentication processing unit provided in the network camera to authenticate the client by receiving authentication information including the offset time from the client in response to an authentication request of the client.

Abstract: A bypass plunger combines a unitary or one-piece hollow body-and-valve cage, retains a dart valve within the valve cage portion of the hollow body using a threaded retaining nut secured by crimple detents. A series of helical grooves surround the central portion of the outer surface of the hollow body of the plunger to control spin during descent. A canted-coil-spring disposed within the retaining nut functions as a clutch. The valve cage includes ports that may be configured to control flow through the plunger during ascent. Other embodiments include clutch assemblies using canted-coil springs with split bobbins, and valve stems surfaced to achieve specific functions.

Abstract: A system and method for directing entrants at a checkpoint using a mobile device, wherein the method can comprise receiving by an Access Control Operations Center (ACOC) server a request for entry, identification data, and a mobile number from a checkpoint computer that are related to an entrant. The method can comprise requesting one or more records associated with the identification data, from one or more public records databases to perform a background check. The method can comprise receiving by the ACOC server the records from the one or more public record databases, determining an initial adjudication result of the background check, communicating an initial directive by the ACOC server to the entrant or to an attendant if the initial adjudication result of the background check does not meet predefined criteria, and sending a subsequent directive on the mobile number based on a subsequent adjudication of the background.

Abstract: A method having the steps of obtaining temporal information communicated to a first device; carrying out one or more of the following tests: a test to determine whether the first device is in a state following an initial operation, a battery replacement or other power outage, or a reset, a test to determine whether a deviation between temporal information of the clock and the communicated temporal information is less than or equal to a threshold which is specified, and a test to determine whether the communicated temporal information has the same date as the temporal information of the clock; and synchronizing the clock using the communicated temporal information if all of one or more defined conditions are satisfied, wherein one of the one or more conditions requires that at least one of the one or more tests carried out has a positive result.

Abstract: A coupling comprises an inner body having an interior bore configured to receive a tube or the like. A collar is arranged to be axially received about the inner body. The collar being configured such that when it is forced onto the inner body, it applies a circumferential compressive force to deform the body inwardly. At least one interior annular projection defines one or more annular teeth arranged such that when a tube is received in the bore and the inner body is inwardly deformed by the collar, the one or more annular teeth engage the tube to seal with it. The inner surface of the bore comprises a plurality of circumferentially arranged projections defining a series of circumferentially spaced teeth axially spaced from the at least one annular protuberance and configured to engage the tube following compression of the inner body by the collar to prevent relative rotation between the tube and the inner body.

Abstract: Apparatus and method for connecting tubular members in a wellbore. A host tubular member has reinforcing annular members mounted thereon to provide regions of differing resistance to the radial load. When the host tubular member is expanded radially outwardly, within a second tubular member, each weaker region starts expanding first and seals the host tubular member against the second tubular member prior to the stronger region. Embodiments of host tubular members are described including members of progressive resistance, split rings, gripper elements and sealing elements.

Abstract: In a method for producing a pipe connection by press fitting, the following steps are carried out to increase the burst pressure: placing a press fitting onto two pipe ends to be connected to one another; compressing the press fitting against one of the two pipe ends by plastically deforming the press fitting and the pipe end to form a bulge and a first indentation; once again compressing the press fitting against the same pipe end at a distance (a) from the first compression point by plastically deforming the press fitting and the pipe end, thereby forming a second indentation; and connecting the press fitting to the second pipe end.

Abstract: A fitting for thick-walled pipes, having a contact region and a pressing region, the pressing region being arranged on the side of the contact region facing towards the pipe insertion opening, and the wall thickness in the pressing region being at least in sections less than the wall thickness in the contact region. The invention also relates to a method for producing a fitting for thick-walled pipes, in which a thick-walled pipe is radially widened in a fitting region arranged at one pipe end so that the internal diameter of the fitting region corresponds substantially to the external diameter of the pipe and the wall thickness in the fitting region corresponds substantially to the wall thickness of the rest of the pipe.

Abstract: An assembly may include a fitting, a first pipe, and a first seal. The fitting may include an annular body having a first insertion end and an inner diametrical surface having a first knurled portion disposed adjacent the first insertion end. The first pipe may include a first end portion that is received into the first insertion end of the body and an outer diametrical surface including knurls formed thereon. The knurls of the outer diametrical surface may engage the first knurled portion of the fitting. The first seal element may be disposed within the fitting and may sealingly engage the first pipe and the fitting body. The engagement between the inner diametrical surface of the fitting and the outer diametrical surface of the pipe may a press fit and/or an interference fit.

Abstract: A pipe fitting and method therefor includes one or more indicators to provide a visual indication that the fitting has been properly pressed around a tube and that the correct amount of pressure has been provided to create a permanent seal. In embodiments, the present invention includes a fitting having a main body component with at least a first segment having an axially inner portion, an axially intermediate portion and an axially outer portion, with a retaining compartment defined therein. The retaining compartment can retain one or more sealing rings, including an indicator sealing ring having an indicator flange extending from its outer surface. An external indicator band can be securely retained around the external surface of the pipe fitting, and can be adapted to change color upon receiving sufficient force, thereby indicating that the fitting has been properly pressed.

Abstract: A fitting for use with corrugated tubing, the fitting comprising: a nut having a passage therethrough for receiving the tubing, the tubing being corrugated tubing having a series of peaks and valleys; a plurality of retainers positioned forward of the nut, the retainers having a sealing surface for placement in a valley of the corrugated tubing; a body having an annular pocket formed circumferentially around the retainers, the body having a body sealing surface, wherein upon sealing, the tubing is compressed between the sealing surface and the body sealing surface; a spring positioned within a cavity in the retainers, the spring driving the retainers into the pocket when the fitting is not sealed.

Abstract: A crimp fitting comprises a female socket that is configured to be crimped to an end portion of a hard tube. The socket comprises an annealed annular wall that has an inner cylindrical surface portion and at least one annular sealing portion. The cylindrical surface portion lies axially between the socket opening and the annular sealing portion, and has a diameter matched to the OD of the tube. The annular sealing portion has an innermost diameter that is greater than the diameter of the cylindrical surface portion. As the end of the tube is inserted into the socket, the tube cannot slideably contact the annular sealing portion. Thus, the annular sealing portion will not be damaged by the insertion of the tube. Thereafter, the annular sealing portion is radially crimped and ultimately contacts and deforms a portion of the tube in a manner creating interlocking geometry and a pressure seal.

Abstract: A push fitting for a valve includes a body having a longitudinal axis along which a fluid can flow, the body defining an opening at a first end of the body. A push fitting assembly at the first end of the body includes a housing. The housing includes a first end which is integrally formed within a wall of the opening at the first end of the body and a crimpable second end which extends longitudinally beyond the first end of the body. The housing also includes a crimpable material such that the second end of the housing is crimpable to capture elements of the push fitting assembly at the first end of the body.

Abstract: A joint structure for connecting lengths of pipe uses a plurality of teeth to engage the surface of at least one end of the adjacent lengths of pipe to connect the ends. A deformable member applies forces to the plurality of teeth to engage the surfaces. In an aspect, the plurality of teeth are releasable. In another aspect, the plurality of teeth are permanently engaged into the surfaces.

Abstract: A fitting coupler is provided configured for coupling a planar fluid conduit and a fluidic device. The fluidic device comprises a cavity, a device conduit, and a mouth where the device conduit opens into the cavity. A contact pressure element is configured for sealingly pressing the planar fluid conduit to the mouth, so that a conduit opening of the planar fluid conduit opens into the mouth.

Abstract: An expansion tool for use in a wellbore includes an expansion surface made up of a concave portion, a convex portion and a straight section therebetween. The straight section is formed according to a formula Y=(1.26) (X)?0.13, where X is the wall thickness of a tubular and Y is the length of the straight section. The concave portion and the convex portion have an arc length extending the concave portion to a trailing edge of the tool. The concave and convex portions are radius-shaped. The arrangement of the shapes and their relation to each other reduces relatively high and low contact pressures and lessens the effects of axial bending in a tubular or a connection.

Abstract: A fitting assembly for joining two pipes. The fitting assembly includes a fitting having a recess in a distal end for receiving a pipe end. A sealing ring is in the recess to provide a fluid-tight seal after the fitting is pressed. Also, a grab-ring is in the recess having a continuous sharp inner edge to engage an outer surface of the pipe after the fitting is pressed.

Abstract: A coupling assembly for joining pipe ends includes a main body sleeve with a shoulder incorporating a sloped step. The main body sleeve has an inner surface with two claiming rings. The assembly further includes a swage ring which is moveable along the outer surface of the pipes. The inner surface of the swage ring includes ramps. The ramps force clamping rings to engage the pipe and form a seal as the swage ring is urged inward towards the main body sleeve. Additionally, the clamping ring includes a tab incorporating a sloped surface with a contour complementary to that of the sloped step. The surface of the clamping ring engages and presses against the surface of the sloped step, thus preventing movement of the swage ring away from the main body sleeve. The disclosure also pertains to a method of joining two pipes utilizing the disclosed coupling assembly.

Abstract: The present invention relates to a drilling tool incorporating first and second ends, a cuttable and/or processable shaft extending between the ends. The first end has a drill bit to penetrate rock. The drill bit and the shaft have complementary threads. The drill bit and the shaft comprise a relative rotation stop means that ensures that the drill bit remains loose during drilling in a first direction. The invention further relates to a self drilling rock bolt, a drill bit, drill shaft and shaft coupling, and an anchoring device per se.

Abstract: A part of a bottom of a flange insertion hole that faces a flange part has a form in which an outer circumference side is nearer to the flange part than an inner circumference side. According to this, since a rounded surface of a perimeter edge of the flange part can easily contact to the bottom of the flange insertion hole, an area that receives caulking load is larger as compared with a case where only a flat surface of the flange part contacts the bottom of the flange insertion hole as before, therefore, the bottom of the flange insertion holes can be prevented from buckling.

Abstract: A fitting for thick-walled pipes, having a contact region and a pressing region, the pressing region being arranged on the side of the contact region facing towards the pipe insertion opening, and the wall thickness in the pressing region being at least in sections less than the wall thickness in the contact region. The invention also relates to a method for producing a fitting for thick-walled pipes, in which a thick-walled pipe is radially widened in a fitting region arranged at one pipe end so that the internal diameter of the fitting region corresponds substantially to the external diameter of the pipe and the wall thickness in the fitting region corresponds substantially to the wall thickness of the rest of the pipe.

Abstract: An exhaust system having a pipe for conveying exhaust from an engine, the end of which has an outwardly-protruding lip; a first pipe flange having a hole large enough to allow the lipped end of the pipe to pass through it, and a recessed shoulder adjacent the hole; a collar, configured to releasably encircle said first pipe, to abut with the recessed shoulder at its outer periphery, and the lipped end of the pipe at its inner periphery, thereby preventing the collar and lipped pipe assembly from passing through said hole; and a second pipe flange configured to attach to said first pipe flange to connect a tail pipe to the first pipe, and to hold the pipe, flange and collar assembly together. The invention also provides counterweights for counterweighted lift trucks adapted to secure such exhaust systems, and methods of fitting such exhaust systems.

Abstract: Device for connecting a tube to a circuit element, including a cartridge type tubular body (1) provided externally with a washer (3) for anchoring the body in a well (2) of the circuit element and provided internally with means (4) for retaining the tube, characterized in that the anchor washer (3) is mounted on an end portion (8) of the tubular body (1) designed to lie at the level of the opening (16) of the well when the connecting device is in use, the end portion (8) being elastically deformable between a deformed state enabling the washer (3) to be placed on the body and a rest state for retaining the washer (3) on the body.

Abstract: First and second ridge portions at the foremost end of a flexible pipe are pressed into first and second enlarged-diameter ridge portions, respectively, each having an external diameter larger than the internal diameter of a rotary nipple and smaller than the front-end root diameter of a taper external thread of the rotary nipple. The back surface of the second enlarged-diameter ridge portion is brought into contact with a front-end surface of the rotary nipple. A rubber seal ring is fitted into each of a first and second root portion of the flexible pipe, respectively, and an aligning ring is fitted into each of a third root portion of the flexible pipe located on the front-end side thereof from the first root portion and a fourth root portion of the flexible pipe located on the back side thereof from the second root portion, respectively.

Abstract: A method to connect piping and a piping connection, having the features of a ring connector configured to snugly fit around an external diameter of a pipe; and a piping shield connected to the ring connector, the piping shield having at least one observation window cut into the shield, wherein the piping shield covers an abutment end of the pipe to be connected, wherein a joint between the ring connector and the piping shield forms a connection.

Abstract: A assembly having a body; at least one port to receive tubing; and a collar group to secure the tubing to the port, wherein the collar group is selected from a first collar group configured to secure the tubing by a flattening a washer, thereby driving teeth of the washer into the tubing, and a second collar group having a smooth interior surface to which the tubing is bonded, wherein either the first or the second collar groups may be interchangeably threaded onto the port.

Abstract: An annular shaped crimp ring construction which incorporates two separate and distinct sections formed adjacent each other on the same annular member. In accordance with the present invention, the first section of the crimp ring comprises an axial length which is substantially greater than the axial length of the second section, with the first section also comprising a thickness which is substantially greater than the thickness of the second section.

Abstract: Barbed fittings having elongated bodies defining open ends and an internal fluid carrying passage interconnecting the ends are disclosed herein, with at least one end having a barb with a reduced outer diameter and/or taper angle to reduce the amount of insertion force necessary to install the fittings, thereby making the fittings easier to insert in conduit and/or other fluid carrying components. To also make the fittings easier to install, a barbed fitting insertion tool is disclosed having a body defining a fitting receptacle in a front portion of the body and a handle portion in the rear portion of the body for gripping and inserting fittings located in the fitting receptacle into conduit. The fitting receptacle having a locking mechanism for securing the fittings to the tool and preventing unintentional removal of same from the tool.

Abstract: A pole assembly comprises a first tubular pole and a second tubular pole, the first pole comprising a central longitudinally extending portion having a first wall thickness and a longitudinally extending coupling portion adjacent the central portion, the coupling portion having a second wall thickness, the second wall thickness being greater than the first wall thickness, the first and second poles capable of being coupled in an end to end configuration with an end portion of one of the first and second poles extending within the other of the first and second poles, the coupling portion of the first pole overlapping the second pole, whereby a coupling between the poles may be formed by applying a radially compressive force around the coupling portion of the first pole.

Abstract: A press fitting, including a tubular component and has an end portion of the tubular component which can be compressed to make a connection. The end portion has an opening to receive a and a first region having an annular ridge to receive a sealing ring. A second region is arranged on the side of the ridge adjacent the opening and a third region is arranged on the side of the ridge remote from the opening. The overall wall thickness of the press fitting in the second region is increased at least in a section or sections in comparison with the wall thickness of the tubular component in the third region.

Abstract: For forming a clamping ring first the pipe is extruded. The extruded pipe is cut to form a pipe part. While extruding the pipe, its inner diameter is formed smaller than the outer diameter of a pipe onto which the clamping ring is positioned before making a pipe connection. The inner diameter of the pipe part is made larger by removing material from the inside of the pipe part but only over part of the length of the pipe part such that a stop edge is formed. The clamping ring is used on a pipe when making a pipe connection.

Abstract: A coupling element has a first interface, which is adapted to mechanically connect the coupling element to an actuator, a second interface, which is adapted to mechanically connect the coupling element to a valve, and a deformable portion, which is shaped in such a manner, that, as a result of a compression along an axial direction of the coupling element, the deformable portion irreversibly bends such that a projection is formed. Thereby, the projection is adapted to permanently engage with an annular groove formed at the actuator, such that the coupling element and the actuator are connected with each other in a non-detachable but rotatable manner.

Abstract: A non-bolt joint structure comprising; a packing ring sealing between a receiving opening section and an insertion opening section; an engaging means provided with an inner circumference of the receiving opening section preventing a polyethylene pipe from disengaging from the receiving opening section by engaging with an outer circumferential surface of the polyethylene pipe; and a tubular metallic inner core fitting an inner circumference of the insertion opening section of the polyethylene pipe, wherein the inner core is plastically deformed to include a first bulge portion that its cross-sectional shape bulges toward an outward radial direction, a second bulge portion is formed so that the insertion opening section of the polyethylene pipe bulges toward the outward radial direction along the first bulge portion of the inner core, and the polyethylene pipe is prevented from disengaging by the engaging means engaging with the outer circumferential surface of the second bulge portion.

Abstract: An adapter integrates a tail piece and connection for coupling to plumbing fittings utilizing a union nut or flange and provides a press-fit connection to the tail piece for installation in the system. The method of manufacturing the adapter comprises the steps of forming a flange on a section of conduit; placing a threaded union nut or mounting flange over the flange fitting; roll-forming an internal, concave annular recess into the section of conduit extending from the nut and inserting an O-ring into the recess for completing the adapter. The adapter can then be sealably attached to a plumbing fitting, such as a valve or the like, utilizing a conventional flat gasket between the flange of the adapter and the plumbing fitting. The installation is completed by inserting a conduit into the adapter to clear the O-ring and crimping the bead formed by the recess to complete the sealed connection.

Abstract: The invention relates to a microfluidic device including a chamber having a fluid inlet, a fluid outlet and a sealable port. In some embodiments, the fluid inlet and the fluid outlet may be positioned to direct fluid flowing from the fluid inlet to the fluid outlet through the chamber. Various embodiments may include a sealable port which may be aligned with the chamber to allow material to be placed directly into, or removed from, the chamber from the exterior of the device when the sealable port is open, and to inhibit and/or prevent fluid escaping through the sealable port when the port is sealed.

Abstract: An assembly for use in a wellbore formed in an earth formation, comprising an expandable tubular element and an outer structure having first and second portions arranged at a distance from each other, the portions being restrained to the tubular element in a manner that the distance changes as a result of radial expansion of the tubular element, the outer structure further having a third portion arranged to move radially outward upon said change in distance between the first and second portions, wherein said radially outward movement of the third portion is larger than the radially outward movement of the tubular element as a result of radial expansion of the tubular element.

Abstract: A connecting arrangement for fluid-conducting tubes (1, 2) has a further fluid transporting component (16). The fluid-conducting tube (1, 2) has at least one collar (3, 4) facing radially outwardly which can be clamped against the further fluid transporting component (16) with the aid of a holder (5). The holder (5) has at least one U-shaped lateral receptacle (6, 7) formed by two arms (12). The predetermined length of the arms (12) is dimensioned such as to enclose more than half of the fluid-conducting tube (1, 2) during plastic deformation. The U-shaped receptacle (6, 7) has at least one relief region (13) in which holes, grooves, cavities or other material reductions are arranged. The cross section of the arms (12) changes little during deformation due to the relief regions because upset material can flow into the same.

Abstract: A device (30) for feeding working fluid to an assembly (14) requiring working fluid includes at least one fluid channel (20, 20a-20d) extending from a surface (16a) and at least one screw element (22, 24) capable of being screwed from the surface (16a) into the at least one fluid channel (20, 20a-20d) for feeding working fluid into the fluid channel (20, 20a-20d) or for closing the fluid channel (20, 20a-20d), the at least one fluid channel (20, 20a-20d) having a first section (32) directly adjacent to the surface (16a) with a larger width, a second section (36) with a smaller width and, between the first section (32) and the second section (36), having a first transition region (34) with an annular surface (34a), and the screw element (22, 24) having at least one sealing surface (22c, 24c) capable of being brought into sealing engagement with the annular surface (34a).