According to an embodiment of the present disclosure, a refrigerant pipe fitting, the fitting having a pipe shape with a hollow to connect a pipe, may include an out pipe opening which is opened at one end of the fitting and into which an out pipe is inserted; an inner pipe opening which is opened at the other end of the fitting and into which an inner pipe is inserted to be inserted into the out pipe inside the fitting; a pressing portion which is configured to form a part of an inner surface of the fitting and formed to have a narrower inner diameter as it extends toward the inner pipe opening to press and deform the out pipe to allow the out pipe to connect with the inner pipe in movement of the fitting; and a fastening portion which is formed on the inner surface of the fitting between the pressing portion and the out pipe opening to constrain an end of the out pipe to prevent the fitting from being separated.

A preassembly for a conduit fitting includes an annular fitting component and at least a first conduit gripping device. The annular fitting component has an interior wall including an inboard surface having a first diameter, an outboard surface having a second diameter, and an intermediate surface recessed from the inboard surface by an outward facing inboard radial wall and recessed from the outboard surface by an inward facing outboard radial wall. The first conduit gripping device is retained within the annular fitting component and includes a body portion and an annular ring portion having an inner radial portion secured to a rear surface of the body portion, and a flange portion extending radially outward of the inner radial portion to define a projection extending radially outward of an outer circumferential surface of the first conduit gripping device, with an end portion of the projection being axially captured between the inboard radial wall and the outboard radial wall.

The present invention relates to a pipe connection (1), which comprises at least one end of a plastic pipe (2) or metal plastic composite pipe (2) and one connecting element (3) with at least one support body (4, 4a) provided with circumferential ribs (5, 5a, 5b, 5c), onto which the end of the pipe (2) is slid, wherein, for the expansion ratio R(exp) of the pipe connection (1), the following applies:

0.05<R(on)=[D(max)/D(internal)]1<0.35

wherein D(max) stands for the maximum external diameter of the circumferential ribs (5, 5a, 5b, 5c) and D(internal) for the internal diameter of the pipe (2).

The present invention relates to a sliding sleeve connection (6) between an expanded end (8) of an all-plastic pipe (7) or of a plastic composite pipe and a connecting element (1), which comprises an expanded end (8) of an all-plastic pipe (7) or of a plastic composite pipe; a connecting element (1) having at least one support body (2, 2a) provided with circumferential external ribs (3, 3a, 3b), onto which the expanded end (8) of the all-plastic pipe (7) or of the plastic composite pipe (7) is slid, and at least one circumferential collar (5, 5a); and a sliding sleeve (9) made of elastically deformable polymer material axially slid onto the expanded end (8), wherein the connecting element (1) comprises a pre-stop (4, 4a) between the circumferential collar (5, 5a) and the nearest circumferential external rib (3b) to the latter, and said pre-stop (4, 4a) constitutes a limitation for sliding onto the end of the pipe (8), wherein the end of the sliding sleeve (9) facing the circumferential collar (5, 5a) protrudes beyond the end of the pre-stop (4, 4a) facing the circumferential external rib (3b).

The present invention relates to a connecting element (1) for producing a pipe connection (6) between the connecting element (1) and a plastic pipe (7) or a metal-plastic composite pipe by using axial pressing technology, wherein the connecting element (1) has at least one support body (2, 2a) provided with circumferential external ribs (3, 3a, 3b) for press-fitting an expanded end (8) of the pipe (7) onto, and comprises at least one circumferential collar (5, 5a), wherein the connecting element (1) between the circumferential collar (5, 5a) and the nearest circumferential external rib (3b) to said circumferential collar (5, 5a) further comprises a pre-stop (4, 4a) for limiting the sliding onto of the expanded end (8) of the pipe (7), wherein the distance between the edge of the pre-stop (4, 4a) facing the circumferential external ribs (3, 3a, 3b) and the edge of the circumferential collar (5, 5a) facing the pre-stop (4, 4a) is 0.10 times to 0.30 times the length of the support body (2, 2a). Furthermore, the present invention relates to a pipe connection (6) between an expanded end (8) of an all-plastic pipe (7) or of a plastic composite pipe (7) and a connecting element (1), comprising an expanded end (8) of an all-plastic pipe (7) or of a plastic composite pipe (7); and a connecting element (1) according to the present invention.

A method of making a crimp connection comprises sliding a crimp ring over a female end of a pipe or tube, the crimp ring having an oval shape; inserting a male end of a fitting into the female end of the pipe or tube; sliding the crimp ring toward the fitting such that the crimp ring at least partly overlaps the inserted male end of the fitting; and applying a compressive force to an exterior surface of the crimp ring. Prior to applying the compressive force, the crimp ring has a first inner diameter and a second inner diameter transverse to the first inner diameter. The first inner diameter is greater than the second inner diameter. The first inner diameter is greater than an outer diameter of the pipe or tube. The second inner diameter is less than the outer diameter of the pipe or tube.

A sealed sleeve installed at an insertion coupling portion in a state in which a first pipe and a second pipe are insertion coupled to each other in order to seal couple the first pipe having a first outer diameter and a first inner diameter and the second pipe having a second outer diameter and a second inner diameter larger than the first outer diameter includes: a pillar shaped-main body having a main body central shaft; a through-hole formed using the main body central shaft as a central shaft on the main body and having an inlet as a second pipe side opening in an installation state and an outlet as a first pipe side opening in an installation state, wherein in the through-hole, a pressing portion that applies a sealing pressure to the insertion coupling portion is formed in a portion of an inner wall, and an inner diameter of the pressing portion is smaller than the second outer diameter.

A preassembly for a conduit fitting includes an annular fitting component and a conduit gripping device. The annular fitting component has an interior wall extending along a central axis from an inboard end to an outboard end. The interior wall includes an inboard surface having a first diameter, an outboard surface having a second diameter smaller than the first diameter, and an intermediate surface recessed from the inboard surface by an outward facing inboard radial wall and recessed from the outboard surface by an inward facing outboard radial wall. The conduit gripping device is retained within the annular fitting component and includes a projection extending radially outward of an outer circumferential surface of the conduit gripping device, and axially toward an inboard end of the conduit gripping device, with an end portion of the projection being axially captured between the inboard radial wall and the outboard radial wall.

A swage apparatus includes a main body for supporting a coupling such that an axis of the coupling is oriented in a first direction, a stopper which comes into contact with one member of a first member or a second member of the coupling and restricts the one member from moving in the first direction, a pusher which comes into contact with the other member of the first member or the second member and pushes the other member in the first direction, and a cover member for covering the coupling so as to prevent the axis of the coupling from becoming displaced. The axis can thereby be prevented from becoming displaced.

A swage fitting for connection of tubes by axial swaging includes a fitting body having a generally cylindrical body and an internal axial bore. A swage end of the fitting body includes a tapered inner surface that compresses a tapered outer surface of a sleeve into the tube when the fitting body is swaged to the sleeve and the tube. An adapter end of the fitting body may be fastened by a permanent or separable connection to another part.