A duct clamp assembly comprises a clamp configured to apply pressure around a connection point of two duct segments, and a gasket positioned on an inner surface of the clamp. The gasket comprises a body made of a foam and a layer made of a solid polymer, and the layer extends around an outer surface of the body.

A duct clamp assembly comprises a clamp configured to apply pressure around a connection point of two duct segments, and a gasket positioned on an inner surface of the clamp. The gasket comprises a body made of a foam and a layer made of a solid polymer, and the layer extends around an outer surface of the body.

A non-metallic fluid coupling is disclosed with electrical current transferring elements incorporated therein. The coupling is formed of two C-shaped halves of non-metal, non-conducting material, where each halve includes integral hinges and latches, or hinges and latches made of a common material with the C-shaped halves. A non-metallic, substantially rigid sealing sleeve can be incorporated into the coupling to seal the coupling while maintaining the strength of the coupling.

A tube assembly comprising first and second tubes connected by means of fittings welded to ends of the respective tubes. The fittings are placed adjacent to each other and then coupled using a clamp, thereby placing the first and second tubes in fluid communication. At least one of the fittings is an orifice fitting configured to restrict the flow of fluid. Each fitting is configured with at least one projection that assists a clamp to hold the fittings together. Preferably the projections are annular. In some embodiments, the orifice fitting comprises a cylindrical wall and a plate extending radially inward from the cylindrical wall and having a circular orifice. The orifice has a radius less than the inner radius of the tube assembly, so that flow will be restricted by the orifice.

A substantially ring-shaped clamp has a first clamp body component joined to a second clamp body component in a manner permitting the first clamp body component to pivot relative to the second clamp body component. A shaft extends from the first clamp body component such that the shaft is able to pivot relative to the first clamp body component. The shaft has a free end that is receivable within and removable from a pocket formed in the second clamp body component. A cam-lever is connected to the first clamp body component in a manner permitting the cam-lever to pivot relative to the first clamp body component. The shaft may be a threadless shaft, and the clamp may be self-locking, adjustable, and/or have a relatively smooth outer periphery.

A coupling device for coupling flanges of two pipes includes a chain assembly and a positioning mechanism. The chain assembly includes plural connecting pieces pivotally connected one by one by pivot members. The connecting pieces at two opposite ends of the chain assembly are defined as a first connecting piece and a second connecting piece. A first pivot member is arranged at the free end of the first connecting piece, and a second pivot member is arranged at the free end of the second connecting piece. The positioning mechanism includes a first portion and a second portion pivotally connected. The first portion is pivotally connected to the first pivot member or the first connecting piece, and the second portion is detachably positioned to the second pivot member. The first portion is rotatable between a release position and a fixed position relative to the second portion.

A coupling device for coupling flanges of two pipes includes a chain assembly and a positioning mechanism. The chain assembly includes plural connecting pieces pivotally connected one by one by pivot members. The connecting pieces at two opposite ends of the chain assembly are defined as a first connecting piece and a second connecting piece. A first pivot member is arranged at the free end of the first connecting piece, and a second pivot member is arranged at the free end of the second connecting piece. The positioning mechanism includes a first portion and a second portion pivotally connected. The first portion is pivotally connected to the first pivot member or the first connecting piece, and the second portion is detachably positioned to the second pivot member. The first portion is rotatable between a release position and a fixed position relative to the second portion.

A pipe coupler includes a first jaw member, a first jaw extension, a second jaw member defining an open channel, a mounting board, a ratchet, and a first biasing member. The first and second jaw members are hinged to each other. The mounting board extends outwardly from the open channel of the second jaw member. The first jaw extension extends from the first jaw member, and is configured to extend into the open channel. The first jaw extension has a plurality of rack teeth. The ratchet is rotatably mounted on the mounting board, and has a plurality of ratchet teeth configured to mesh with the rack teeth. The first jaw extension is permitted to drive the ratchet to rotate unidirectionally against a first biasing force of the first biasing member.

A pipe coupler includes a first jaw member, a first jaw extension, a second jaw member defining an open channel, a mounting board, a ratchet, and a first biasing member. The first and second jaw members are hinged to each other. The mounting board extends outwardly from the open channel of the second jaw member. The first jaw extension extends from the first jaw member, and is configured to extend into the open channel. The first jaw extension has a plurality of rack teeth. The ratchet is rotatably mounted on the mounting board, and has a plurality of ratchet teeth configured to mesh with the rack teeth. The first jaw extension is permitted to drive the ratchet to rotate unidirectionally against a first biasing force of the first biasing member.

A clamping device suitable for securing a pair of flanges together is a unitary strip of a polymeric material that defines a multiplicity of clamping segments linked by flexible strip portions. The ends of the unitary strip define latching elements shaped to interconnect when the ends are brought together. Along one face of the unitary strip the clamping segments define teeth that project at opposite sides of the unitary strip, and these teeth define faces that are adapted in use to contact outer faces of the pair of flanges. Each clamping segments may define two opposing teeth. The clamping device can be operated with a single hand, being bent around the outside of the pair of flanges so that the clamping segments engage opposite faces of the pair of flanges and hold them together, and the latching elements are interconnected.