A fitting assembly configured to visibly indicate nut tightness when coupling a first component to a second component is disclosed. The fitting assembly comprises a nut comprising a threaded portion and a chamber portion, wherein the chamber portion comprises one or more through-holes. The fitting assembly also comprises an indicator slidably disposed within the chamber portion, a retainer assembly disposed within the chamber portion and configured to interlock with an inner surface of the nut, and a spring disposed within the chamber portion between, and engaging, the indicator and the retainer assembly. The retainer assembly is configured to interface with the spring to retain the spring within the chamber portion. The fitting assembly is configured to receive the first component and the second component such that, when the nut is rotated, a visibility of the indicator through the one or more through-holes changes.

A compression fitting includes a nut with a threaded end for receiving a threaded tube and a receiving end for holding a plunger head; and a plunger with an inner bore for receiving a capillary tube and the plunger head for engaging a ferrule positioned within the receiving end between the plunger head and the threaded tube, the plunger slidingly engaged with the nut to force the ferrule from the nut.

A system to provide at least two circumferential metal to metal seals between coaxial tubulars. Where a first tubular includes a circumferential shoulder having a circumferential first metal seal and a circumferential second metal seal. A second tubular has a circumferential shoulder that matches and abuts the first tubular circumferential shoulder. Each metal seal is of a material having a higher yield strength than the second tubular shoulder such that the first metal seal and the second metal seal will penetrate the material of the second tubular shoulder thereby providing a seal. Additionally a test port is provided from the exterior of the exterior tubular to a point on either the first or second tubular between the first and second metal seals.

A torque operable conduit union and mating spanner wrench are shown for the hammerless coupling of the ends of abutting fluid conduits, such as pipe, hoses, and fittings. A union nut body has an upper peripheral planar face, a lower peripheral planar face and a circumferential side wall. The circumferential side wall has a series of protuberances extending outwardly therefrom which define at least two circumferentially spaced wrench receiving formations. Each of the wrench receiving formations includes a slot portion which communicates with a transverse opening portion of the formation. The mating spanner wrench has a bridge region which spans certain of the receiving formations and engaging tangs which engage the slot portions of the formations for applying torque to the union nut.

In metal-on-metal sealing structures, the sealing criteria employed for high pressure liquid fuel does not work when sealing gaseous fuels. An improved method for sealing a gaseous fuel between gaseous fuel conduits in an internal combustion engine comprises forming a contact band between two surfaces of a sealing structure between a first conduit and a second conduit. A width of the contact band is at least equal to the larger of a minimum contact pressure width where contact pressure is at least equal to a predetermined minimum contact pressure; and a minimum yield zone width where at least one of the two surfaces have plastically deformed.

A fluid transport coupling subcomponent can include a body having a first axial end with a first axial face, a second axial end, and a hollow conduit extending between the first and second axial ends, a tongue extending longitudinally from the first axial face; and a groove recessed into the first axial face. The tongue can extend a distance, D.sub.T1, from the first axial face and the groove can extend a distance, D.sub.G1, into the body from the planar face, where D.sub.G1 and D.sub.T1 can be different.

The present disclosure relates to purification cassettes that have reinforcing features. One embodiment relates to a purification cassette with tensions members. A purification system may include a removable cassette defining a media cavity. A set of tension members may span between a first sidewall and second sidewall. The set of tension members can divide the media cavity into a plurality of lanes.

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 gas-tight sealing device (10) encloses at least one part of a coupling element (12) as well as at least one section of a line element (14) connected to the coupling element (12). The the gas-tight sealing device (10) comprises a sealing device portion or wall (11) that adjoins a first sealing point and a second sealing point (16, 18). The sealing device portion or wall (11) extends around, in a gas-tight manner, the line element (14) and the coupling element (12) or a wall (20), or a further line element, in or at which the coupling element (12). The gas-tight sealing device (10) encloses a volume defined by the geometry of the sealing device portion (11) in a gas-tight manner between the first sealing point (16) and the second sealing point (16, 18).

A wing nut may include a body having a first part extending from a first end surface to a parting line and a second part extending from the parting line to a second end surface. A passage may axially extend through the body, the passage defining an interior surface of the body. An internal threaded section may be formed on an interior surface of the first part. An internal shoulder may be formed on the interior surface of the second part. A stress relief may be formed on the interior surface of the second part between the internal shoulder and the parting line. A rib may extend inward from the interior surface of the second part, the rib being intermediate the stress relief and the internal threaded section. At least one lug may extend radially from the exterior surface of the body.