Compression fittings for pipes having a range of diameters, including a support body with a central section between end sections, the central section having a smaller diameter than the end sections, with a transition surface between the central section and each end section. A gasket fits over a pipe and engages one of the support body end section end surfaces. A fitting nut is movable axially over the support body to draw the support body and the gasket together in the axial direction and bias the gasket radially inward against the pipe. A grip ring encircles the pipe at one gasket end and has a surface engaging the fitting nut whereby the fitting nut biases the grip ring radially inwardly toward the pipe. An insert adapter has a hub with a radially extending flange may block the other gasket end to load the gasket between its axial ends.

A connecting device for pipelines or hose lines with a threaded body and with a pipe-like end piece which can be inserted into a receptacle formed on the threaded body and which can be fitted therein by means of a swivel nut screwed onto the threaded body, wherein the receptacle of the threaded body has the shape of a widening cone and the circumferential surface of the end piece that engages in the receptacle has a conical design, is characterized in that the circumferential surface (12) of the threaded body (10) that bears the external thread (30) has, in the direction of the front end of said surface, an inclined profile directed opposite to the cone of the receptacle (11), and the swivel nut (17) has, with its surface (18) bearing the internal thread (31), a profile complementary thereto, and the external thread (30) and internal thread (31) are designed as tapered threads in such a way that a radial force emanating from the tapered thread with the swivel nut (17) screwed on is directed opposite to the radial force exerted, with the connecting device mounted, by the conical end piece (13) onto the receiving cone (11) formed in the threaded body (10).

A connecting device for pipelines or hose lines with a threaded body and with a pipe-like end piece which can be inserted into a receptacle formed on the threaded body and which can be fitted therein by means of a swivel nut screwed onto the threaded body, wherein the receptacle of the threaded body has the shape of a widening cone and the circumferential surface of the end piece that engages in the receptacle has a conical design, is characterized in that the circumferential surface (12) of the threaded body (10) that bears the external thread (30) has, in the direction of the front end of said surface, an inclined profile directed opposite to the cone of the receptacle (11), and the swivel nut (17) has, with its surface (18) bearing the internal thread (31), a profile complementary thereto, and the external thread (30) and internal thread (31) are designed as tapered threads in such a way that a radial force emanating from the tapered thread with the swivel nut (17) screwed on is directed opposite to the radial force exerted, with the connecting device mounted, by the conical end piece (13) onto the receiving cone (11) formed in the threaded body (10).

A connection arrangement for connecting a metallic pipeline has a screw connection body having a pipe holder for the pipeline, a union nut that can be screwed onto the screw connection body and a cutting ring disposed between the screw connection body and the union nut. The cutting ring has an outer cone that interacts with an inner cone of the pipe holder of the screw connection body. The cutting ring has an essentially radial contact surface, subsequent to the outer cone, which surface limits tightening against a face surface of the screw connection body. An elastomer circumferential seal is disposed in a ring groove in the region of the outer cone of the cutting ring. The ring groove, which accommodates the elastomer circumferential seal, is disposed in the outer cone of the cutting ring, at a distance from its contact surface and, wherein a ring surface is formed between the ring groove and the contact surface.

A connection arrangement for connecting a metallic pipeline has a screw connection body having a pipe holder for the pipeline, a union nut that can be screwed onto the screw connection body and a cutting ring disposed between the screw connection body and the union nut. The cutting ring has an outer cone that interacts with an inner cone of the pipe holder of the screw connection body. The cutting ring has an essentially radial contact surface, subsequent to the outer cone, which surface limits tightening against a face surface of the screw connection body. An elastomer circumferential seal is disposed in a ring groove in the region of the outer cone of the cutting ring. The ring groove, which accommodates the elastomer circumferential seal, is disposed in the outer cone of the cutting ring, at a distance from its contact surface and, wherein a ring surface is formed between the ring groove and the contact surface.

A polymer-lined fluid transmission line includes various structures, including a first polymer-lined pipe, a second polymer-lined pipe, and one or more sleeve retainers installed at a pipe junction between the polymer-lined pipes. Among other things, the sleeve retainers may include one or more protuberances to frictionally engage the polymer-lined pipes or a one or more portions that protrude into a space between the polymer-lined pipes to help retain and protect polymer sleeves.

A polymer-lined fluid transmission line includes various structures, including a first polymer-lined pipe, a second polymer-lined pipe, and one or more sleeve retainers installed at a pipe junction between the polymer-lined pipes. Among other things, the sleeve retainers may include one or more protuberances to frictionally engage the polymer-lined pipes or a one or more portions that protrude into a space between the polymer-lined pipes to help retain and protect polymer sleeves.

A polymer-lined fluid transmission line includes various structures, including a first polymer-lined pipe, a second polymer-lined pipe, and one or more sleeve retainers installed at a pipe junction between the polymer-lined pipes. Among other things, the sleeve retainers may include one or more protuberances to frictionally engage the polymer-lined pipes or a one or more portions that protrude into a space between the polymer-lined pipes to help retain and protect polymer sleeves.

A compression-type fitting for connecting pipes to hydraulic or pneumatic components or for connecting pipes together, particularly for refrigeration systems, comprising a fitting body provided with a male thread adapted to be engaged by a female thread of a locking nut, an ogive being interposed between the locking nut and the fitting body, a sealing gasket being provided between the ogive and the fitting body, the ogive being adapted to adhere to the external surface of a pipe to be connected; the locking nut has an internal taper such as to deform, during the tightening action, the ogive and produce a constriction thereof on the pipe to be connected.

A torque nut with an axially deformable projection protruding from the axially inner end face of the torque nut. The torque nut may be assembled as part of a compression fitting including one or more ferrules for engaging a tube held within the torque nut and a fitting body onto which the torque nut can be threaded. The axially deformable projection will engage an opposing face on the fitting body and this allows a person tightening the torque nut to to feel when the torque nut is madeup to prevent undermaking or overmaking the torque nut. When the axially deformable projection engages the fitting body, there will be an abrupt increase in torque needed to tighten the torque nut on the fitting body after only partial axial deformation of the axially deformable projection relative to the axially inner end face of the torque nut.