A fluid coupling includes a first adapter, a second adapter, an inner sleeve connected to the first adapter and the second adapter, a nut connected to the first adapter and the second adapter, a sealing member connected to one of the first adapter and the second adapter, and/or an outer sleeve connected to the nut. The outer sleeve may include a chamber provided between an inner wall of the outer sleeve and an outer wall of the outer sleeve.

A coupling includes a first coupler, a second coupler, a seal, and a friction member. The first coupler is connectable to a first fluid line, and includes a first axial end face with a groove. The second coupler is connectable to a second fluid line, and is couplable with the first coupler to define a passage therethrough. The second coupler includes a second axial end face with a channel. The second axial end face is contactable with the first axial end face. The seal is received within the groove and is adapted to abut the second axial end face of the second coupler to prevent a leakage of fluid from the passage. The friction member is received within the channel and is adapted to engage the first axial end face of the first coupler to restrict a torsional movement between the first coupler and the second coupler.

A fitting for a fluidic coupling includes a tube assembly that includes an inner tube, an intermediate tube formed of a polymeric material and disposed over at least a portion of a length of the inner tube, and an outer tube formed of a metal and disposed over the intermediate tube. The inner tube has an inner tube endface and a first fluid channel. The intermediate tube includes an extruded portion having a length and an intermediate tube endface. The outer tube has an outer tube endface and an outer surface. First and second radial crimps are formed on the outer surface at first and second distances from the outer tube endface and extend for first and second axial lengths, respectively. The inner and outer tube endfaces are co-planar and the intermediate tube endface is separated from the inner and outer tube endfaces by the length of the extruded portion.

A flow passage joint structure includes: a first external thread portion formed, at an end portion of first piping block, radially outward of flow passage hole; a second external thread portion formed, at an end portion of second piping block, radially outward of flow passage hole; a union nut having a first internal thread portion to be screwed to the first external thread portion, on one side in an axial direction thereof, and having a second internal thread portion to be screwed to the second external thread portion, on another side in the axial direction thereof; and a gasket configured to seal a connection portion between the flow passage holes on a radially inner side of the union nut. The first external thread portion and the first internal thread portion are right-hand threads, and the second external thread portion and the second internal thread portion are left-hand threads.

An integrated block 1 serving as a fluid device includes: a flow port 13 open to form one end of a passage P; an annular groove 14 arranged along an outer circumferential edge of the flow port 13, the annular groove 14 being open so as to insert the gasket 2 therein; a first tapered portion 17 arranged on a radially-inner side interior wall 14b of the annular groove 14 and sloped radially outward from an open end of the annular groove 14 in a depth direction of the annular groove 14; and a guide 18 arranged on a radially-outer side interior wall 14a of the annular groove 14, extending throughout a predetermined range D from the open end of the annular groove 14 in the depth direction, and having a larger diameter than an outer circumferential surface 22a of a second sealing portion 22 of the gasket 2.

A medical connector link for establishing a fluid connection between two fluid lines includes a first male link element/connector element and a second female link element/connector element. The male link element is arranged or arrangeable in the female link element such that a fluid passage of the male link element and a fluid passage of the female link element form a common fluid passage. The connector link further includes a seal element arranged within a circumferential groove on an outer side of the male link element or on an inner side of the female link element. The seal element seals a radial gap between the female link element and the male link element. The male link element and/or the female link element have at least one recess that fluidically connects the common fluid passage with the circumferential groove.

A pipe union assembly that includes a female end of a first pipe section and a male end of a second pipe section. The pipe union assembly also includes a quick union nut securable to the female end, a retainer collar securable to the quick union nut and a segmented load ring disposed between the male end of the second pipe section and the quick union nut. The quick union nut, the retainer collar and the segmented load ring cooperate to maintain the male end of the second pipe section inside the female end of the first pipe section. A method of using the pipe union assembly to join a first pipe section and a second pipe section.

An enhanced seal may comprise an inner portion and an outer portion. The inner portion may comprise an inner cylindrical portion and an inner annular portion. The outer portion may comprise an outer cylindrical portion and an outer annular portion. The inner portion may be made of a harder material than the outer portion and may provide support to the outer portion.

Provided are a seal structure in which sealing performance is ensured over a long period of time even when it is used for low-temperature fluids, a sealing method, and a coupling including the seal structure. The seal structure includes an annular gasket interposed between a first member and a second member. The first member is provided on its surface facing the gasket with: a first surface located on the inner diameter side; a first annular protrusion located on the outer diameter side of the first surface; a second surface located on the outer diameter side of the first protrusion; a second annular protrusion located on the outer diameter side of the second surface and having a greater protruding amount with respect to the second surface than that of the first protrusion; and a third surface located on the outer diameter side of the second protrusion.

Provided are a seal structure in which sealing performance is ensured over a long period of time even when it is used for low-temperature fluids, a sealing method, and a coupling including the seal structure. The seal structure includes an annular gasket interposed between a first member and a second member. The first member is provided on its surface facing the gasket with: an annular protrusion; an inclined surface located on an inner diameter side with respect to the annular protrusion and inclined in a direction away from the gasket; and an outer-diameter-side surface located on an outer diameter side with respect to the protrusion.