A press fitting, including a tubular component and an end portion of the tubular component which can be compressed to make a connection. The end portion has an opening to receive a tube 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.

A coupling includes a male adapter and a female adapter, and may include a nut and a sleeve. In embodiments, the male adapter includes a male adapter inner diameter, and may include threads. A method of operating a fluid coupling may include providing a first member, a second member, a nut, and a sleeve, connecting the sleeve with the nut such that rotation of the sleeve causes rotation of the nut, rotating the sleeve to connect the first member with the second member, engaging an inner ratchet profile of the sleeve with a ratchet profile of a shoulder of the first member, and covering the shoulder of the first member, including the ratchet profile, with the sleeve.

Method and apparatus for producing a curved tubular segment comprising obtaining a curved external tubular element and a curved internal tubular element made of a material having a resistance to wear greater than that of the curved external tubular element and having a cross section such as to cover at least part of the internal surface of the curved external tubular element. It provides the insertion of the curved internal tubular element inside the curved external tubular element after heating the latter by means of a heating unit. Moreover, to form the curved external tubular element on the exact geometry of the curved internal tubular element a molding unit and a cooling unit are used to obtain a curved tubular segment without spaces between the curved external tubular element and the curved internal tubular element.

Method and apparatus for producing a curved tubular segment comprising obtaining a curved external tubular element and a curved internal tubular element made of a material having a resistance to wear greater than that of the curved external tubular element and having a cross section such as to cover at least part of the internal surface of the curved external tubular element. It provides the insertion of the curved internal tubular element inside the curved external tubular element after heating the latter by means of a heating unit. Moreover, to form the curved external tubular element on the exact geometry of the curved internal tubular element a molding unit and a cooling unit are used to obtain a curved tubular segment without spaces between the curved external tubular element and the curved internal tubular element.

An optimized connection structure includes: pipe fittings (1) which is provided with radial through holes (13) about the periphery of the connecting part, multifunctional plugs (2, 20) which include: a plugging body (21) at the tail end, a groove (23) in the middle, and a large and a small positioning steps (22, 24) arranged in the inner holes of the tail ends of the pipe fittings (1), and a connecting member (3) which may be of a cast/forged composite structure, wherein an inner layer and an outer layer of metal rings (42, 41) and a plurality of radial and axial metal posts (43, 44) connecting the pipe fittings (1).

A formation and rotation apparatus for use in forming and rotating interconnected sections of a cylindrical workpiece, including a frame and a head arranged within the frame, the head defining two slots and being operatively rotated via an integral drive assembly. A first slide block is slidably disposed within one of the two slots, and a second slide block is disposed within another of the two slots, each of the first and the second slide blocks include a cutting wheel and a beading wheel for successively forming each of the interconnected sections. An armature having an axis of rotation is also provided, along with a gripping mechanism being operatively connected to the armature. A drive mechanism selectively rotates the armature about the axis of rotation after the gripping means has closed about one of the interconnected sections.

A formation and rotation apparatus for use in forming and rotating interconnected sections of a cylindrical workpiece, including a frame and a head arranged within the frame, the head defining two slots and being operatively rotated via an integral drive assembly. A first slide block is slidably disposed within one of the two slots, and a second slide block is disposed within another of the two slots, each of the first and the second slide blocks include a cutting wheel and a beading wheel for successively forming each of the interconnected sections. An armature having an axis of rotation is also provided, along with a gripping mechanism being operatively connected to the armature. A drive mechanism selectively rotates the armature about the axis of rotation after the gripping means has closed about one of the interconnected sections.

An apparatus for forming and sealing a duct member for use in an air handling system. At least one work station accommodates a work piece, which is generally a cylindrical tube.

An apparatus for forming and sealing a duct member for use in an air handling system. At least one work station accommodates a work piece, which is generally a cylindrical tube.

A workpiece processing method includes preparing a workpiece having a plate portion that includes a base material and a first coating layer. The base material has a first surface and a second surface opposite to the first surface in a direction along a thickness of the base material. The first coating layer is provided on the second surface of the base material. The first coating layer in a first region of the plate portion is removed. A burring tool is moved in a first direction from the first surface toward the second surface in a rotating state to burr the plate portion so as to form a through hole and a flange in the first region of the plate portion after removing the first coating layer in the first region.