A coining apparatus for forming a sealing surface in an end portion of a tube includes an inner portion having a first bead forming surface and an outer portion having a second bead forming surface. The outer portion is arranged concentric to the inner portion with a radial gap formed therebetween. The first bead forming surface and the second bead forming surface each lead towards the gap and are tapered in opposing radial directions. The radial gap provides a pathway for a flow of deformed tube material or a flow of fluid during the formation of an engaging bead in the sealing surface as caused by engagement of the first bead forming surface and the second bead forming surface with the end portion of the tube. The formation of the engaging bead via the coining process results in at least a portion of the engaging bead being work hardened.

A coining apparatus for forming a sealing surface in an end portion of a tube includes an inner portion having a first bead forming surface and an outer portion having a second bead forming surface. The outer portion is arranged concentric to the inner portion with a radial gap formed therebetween. The first bead forming surface and the second bead forming surface each lead towards the gap and are tapered in opposing radial directions. The radial gap provides a pathway for a flow of deformed tube material or a flow of fluid during the formation of an engaging bead in the sealing surface as caused by engagement of the first bead forming surface and the second bead forming surface with the end portion of the tube. The formation of the engaging bead via the coining process results in at least a portion of the engaging bead being work hardened.

A method of forming an assembly between a panel and a tube includes forming a hole in the panel, where a diameter of the hole is smaller than an outer diameter of the tube, and preforming a first end of the tube to conceal the hole of the panel. A diameter of the preformed portion is greater than the diameter of the hole and the outer diameter of the tube. The method further includes aligning a second end of the tube with the hole of the panel, followed by inserting the tube into the hole by application of axial force on the tube until the preformed first end of the tube abuts a periphery of the hole of the panel. The method also includes achieving an interference fit between the hole of the panel and the tube.

A union screw (1) for pipes (2) provided with at least one flare (21) comprises a metal base body (10) which accommodates the pipe (20). The union screw (1) further comprises a screw head (12), a threaded portion (13), a contact portion (15) which is configured to abut the flare (21) of the pipe (20), and a functional layer (40) with which the base body (10) is coated at least in the region of the threaded portion (13) and the contact portion (15). The functional layer (40) is multi-layered and consists of at least one base coat (41) and a top coat (42) applied to the base coat (41) at least in some areas. The base coat (41) forms a structure for creating corrosion protection and a far-reaching invariance with regard to the material of the usual friction partners of the union screw (1) which, in addition to a binder, also contains zinc in the form of zinc-containing lamellae (43), which are oriented to lie substantially flat on the base body (10).

A clamp ring type metal seal gas pipe joint is connected to one end of a gas pipe, and includes a fitting joint, a nut, and a clamp ring. Axial contact surfaces of the clamp ring and the fitting joint are respectively provided with a convex portion configured in a convex V shape and a concave portion configured in a concave V shape matched with each other, so that an end part of the gas pipe is compressed and self-flared to form a sealing part when the fitting joint is tightened. In the process of tightening the nut and the fitting joint, the end part of the metal bellow is compressed and self-flared by the convex portion of the clamp ring and the concave portion of the fitting joint to form a cone surface to realize limit fixation and form a double sealing.

A method of forming an assembly between a panel and a tube includes forming a hole in the panel, where a diameter of the hole is smaller than an outer diameter of the tube, and preforming a first end of the tube to conceal the hole of the panel. A diameter of the preformed portion is greater than the diameter of the hole and the outer diameter of the tube. The method further includes aligning a second end of the tube with the hole of the panel, followed by inserting the tube into the hole by application of axial force on the tube until the preformed first end of the tube abuts a periphery of the hole of the panel. The method also includes achieving an interference fit between the hole of the panel and the tube.

A pipe joint is connected with a connecting pipe, and includes a pipe joint body and a nut member. When the connecting pipe formed with a bead expanded in the radial direction is connected with this pipe joint, a male thread of the pipe joint body is engaged with a female thread of the nut member to hold the bead between a tapered face and a tapered face. In addition, the joined portion between the bead and the tapered face forms a first sealed portion, and a joined portion between the bead and the tapered face forms a second sealed portion. Still further, a tapered face of the pipe joint body is joined with the tapered face of the nut member to form a third sealed portion.

A pipe joint is connected with a connecting pipe, and includes a pipe joint body and a nut member. When the connecting pipe formed with a bead expanded in the radial direction is connected with this pipe joint, a male thread of the pipe joint body is engaged with a female thread of the nut member to hold the bead between a tapered face and a tapered face. In addition, the joined portion between the bead and the tapered face forms a first sealed portion, and a joined portion between the bead and the tapered face forms a second sealed portion. Still further, a tapered face of the pipe joint body is joined with the tapered face of the nut member to form a third sealed portion.

A swage visual indicator for a fluid coupling is disclosed and related methods. The swage visual indicator is achieved by a non-destructive visual indication of a swaging process by one or more swage apertures formed through a flange filled with an indicator material. The swage apertures communicate with swaging grooves of the fluid conveying components being joined. As the swaging process is conducted, the swaging grooves are filled with material from one of the fluid conveying components, and the indicator material within the aperture(s) is therefore displaced in a direction toward the exposed exterior surface of the flange. According to a successful swaging process, the indicator material is displaced to a degree such that the indicator material is visible by the unaided eye of an inspector.

A swage visual indicator for a fluid coupling is disclosed and related methods. The swage visual indicator is achieved by a non-destructive visual indication of a swaging process by one or more swage apertures formed through a flange filled with an indicator material. The swage apertures communicate with swaging grooves of the fluid conveying components being joined. As the swaging process is conducted, the swaging grooves are filled with material from one of the fluid conveying components, and the indicator material within the aperture(s) is therefore displaced in a direction toward the exposed exterior surface of the flange. According to a successful swaging process, the indicator material is displaced to a degree such that the indicator material is visible by the unaided eye of an inspector.