A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves. Rotation of the second body relative to the first body is resisted by the engagement of the anti-rotation fingers with the anti-rotation grooves.

A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves. Rotation of the second body relative to the first body is resisted by the engagement of the anti-rotation fingers with the anti-rotation grooves.

A plumbing fitting of a first plastic material comprises at least one annular branch defining a hollow port. A sleeve of a second plastic material can be inserted into the hollow port. The sleeve is retained within the hollow port by a retaining member which is fitted to the outer end and outer wall of the annular branch. The sleeve is configured to facilitate attachment of the plumbing fitting to a second plumbing fitting by insertion of the second plumbing fitting into the hollow port, wherein the second plumbing fitting is of the second plastic material.

The connector assembly includes a housing with an open bore which extends along an axis from an open first end to an open second end. The housing further includes a plurality of fingers that are spaced circumferentially from one another and are deflectable in a radial direction. At least one of the fingers has a plurality of teeth that are spaced axially from one another and extend into the open bore of the housing for biting into the first tube to resist pull out of the first tube from the open bore. Each of the teeth also extends by a height to a leading edge of an engagement surface which also includes an angled portion that extends at an angle relative to the axis. The axially spaced teeth have at least one of differing heights and differing angles of the angled portions.

The present disclosure provides a pipe coupling that includes a coupling body, a first pack joint nut, and first and second sleeves. The coupling body is made of a first metal material and the first pack joint nut is made of a second metal material. The first pack joint nut is configured to receive a portion of a first pipe. The pipe is made of a dissimilar metal material to the first and second metal materials of the coupling body and the first pack joint nut, respectively. The first sleeve is configured to line at least a portion of an inner periphery of the coupling body. The second sleeve is configured to line at least a portion of an inner periphery of the first pack joint nut. The first and second sleeves are made of non-metallic materials, and serve as physical non-metallic barriers between the first/second metal materials of the coupling/first pack joint nut, and the dissimilar metal material of the first pipe.

A dissimilar metal connection arrangement comprising a dissimilar metal connection between a first member made of a first metal and having a first end, and a second member made of a second metal different from said first metal with regard to its metallurgical behavior, and having a second end, wherein the first end of the first member is fixedly connected to the second end of the second member. An increased lifetime of the connection is achieved by arranging a heating means at said dissimilar metal connection for controlled heating of said dissimilar metal connection.

A seawater suction system (10) is provided comprising first and second conduits (12, 14) connected to one another so as to form an internal fluid passage allowing fluid communication between the two conduits (12, 14), wherein the first conduit (12) is formed from at least two layers of a first material and the second conduit (14) is formed from a single layer of a second material which is different from the first material.

A coupler assembly kit and methods of use are described. Embodiments of the coupler assembly kit can be implemented to couple a corrugated pipe to a concrete section. Generally, the assembly kit can be implemented to couple a spigot end of the corrugated pipe to a bell end of the concrete section. In one embodiment, the coupler assembly kit can include a circumferential cable, a plurality of second cables having a threaded rod on end and an eye bolt on the other end, a plurality of linkage crosses, and a gasket. The coupler assembly kit can be assembled and implemented on location to connect a high-density polyethylene corrugated pipe to a reinforced-concrete flared end section.

A coupling body having an opening and configured to receive a pipe in the opening. The coupling body is made of a metal material and the pipe is made of a different metal material to the metal material of the coupling body. An insulating sleeve lines at least a portion of an inner periphery of the coupling body adjacent the opening. The insulating sleeve is made of non-metallic material and is configured to serve as a physical non-metallic barrier between the metal material of the coupling and the different metal material of the pipe so the different metal material of the pipe does not contact the metallic material of the coupling body.

The present invention discloses a compressor comprising: an outer pipe being connected from an outside to pass through the vessel; an inner pipe being closely inserted into the outer pipe; a compression mechanism including a suction hole formed of a blind hole and a suction valve in the suction hole. The suction valve includes a seal on a side facing an opening of the suction hole to seal an entire end of the inner pipe on a side facing the suction valve when the compressor stops.