A duct coupling apparatus includes a collar portion having a first end and a second end, a flange disposed about the collar portion in a manner that divides the collar portion into an first side and a second side, and a retaining structure extending from a surface of the flange towards the second side of the collar portion. The retaining structure and the collar portion define therebetween an annular region for receipt of a sealing element, such as an o-ring or gasket. The retaining structure prevents the sealing element from extruding outwards and/or failing when under pressure.

A duct coupling apparatus includes a collar portion having a first end and a second end, a flange disposed about the collar portion in a manner that divides the collar portion into an first side and a second side, and a retaining structure extending from a surface of the flange towards the second side of the collar portion. The retaining structure and the collar portion define therebetween an annular region for receipt of a sealing element, such as an o-ring or gasket. The retaining structure prevents the sealing element from extruding outwards and/or failing when under pressure.

A flexible hose end fitting assembly includes a first portion defining a first fluid passageway and having a first end configured for coupling to a fluid conduit, a second portion defining a second fluid passageway and having a first end configured for coupling to a second end of the first portion and a second end configured for securely affixed to a flexible hose. A gasket is disposed in a groove formed in an interface between the first portion and the first end of the second portion of the assembly, and the first portion and the first end of the second portion of the assembly are securely fastened together by a plurality of threaded fasteners to form a continuous fluid passageway between the fluid conduit and the flexible hose. A flexible hose end fitting assembly includes a first portion defining a first fluid passageway and having a first end configured for coupling to a fluid conduit, a second portion defining a second fluid passageway and having a first end configured for coupling to a second end of the first portion and a second end configured for securely affixed to a flexible hose. A gasket is disposed in a groove formed in an interface between the first portion and the first end of the second portion of the assembly, and the first portion and the first end of the second portion of the assembly are securely fastened together by a plurality of threaded fasteners to form a continuous fluid passageway between the fluid conduit and the flexible hose.

A flexible hose end fitting assembly includes a first portion defining a first fluid passageway and having a first end configured for coupling to a fluid conduit, a second portion defining a second fluid passageway and having a first end configured for coupling to a second end of the first portion and a second end configured for securely affixed to a flexible hose. A gasket is disposed in a groove formed in an interface between the first portion and the first end of the second portion of the assembly, and the first portion and the first end of the second portion of the assembly are securely fastened together by a plurality of threaded fasteners to form a continuous fluid passageway between the fluid conduit and the flexible hose. A flexible hose end fitting assembly includes a first portion defining a first fluid passageway and having a first end configured for coupling to a fluid conduit, a second portion defining a second fluid passageway and having a first end configured for coupling to a second end of the first portion and a second end configured for securely affixed to a flexible hose. A gasket is disposed in a groove formed in an interface between the first portion and the first end of the second portion of the assembly, and the first portion and the first end of the second portion of the assembly are securely fastened together by a plurality of threaded fasteners to form a continuous fluid passageway between the fluid conduit and the flexible hose.

A coupling has first and second segments attached to one another end to end surrounding a central space for receiving pipe elements. A spring assembly attaches the segments at one end and an adjustable attachment assembly attaches the segments at the opposite end. The spring assembly biases the segments away from one another sufficient to permit insertion of the pipe elements into the central space while the segments are attached to one another. The coupling may include a split ring toothed retainer for coupling plain end pipe elements, or it may have arcuate keys which engage grooved or shouldered pipe elements.

In an aspect a pipe coupling arrangement includes two end members, each having a pipe attachment end and a sealing end that engages the other's sealing end. Each sealing end includes radially inner and outer collars, which are radially separated by a pocket. When the sealing ends engage one another the pockets form a chamber. At least one seal member is positioned in the chamber. An alignment ring fits in the chamber, aligning the end members. A coupling pushes the end members towards each other, compressing the at least one seal member sufficiently to seal against fluid leakage. The inner collars engage one another while the outer collars of the end members are axially spaced apart by a gap selected to reduce to zero upon application of a selected clamping force on the end members, thereby limiting deformation of the outer collars.

In an aspect a pipe coupling arrangement includes two end members, each having a pipe attachment end and a sealing end that engages the other's sealing end. Each sealing end includes radially inner and outer collars, which are radially separated by a pocket. When the sealing ends engage one another the pockets form a chamber. At least one seal member is positioned in the chamber. An alignment ring fits in the chamber, aligning the end members. A coupling pushes the end members towards each other, compressing the at least one seal member sufficiently to seal against fluid leakage. The inner collars engage one another while the outer collars of the end members are axially spaced apart by a gap selected to reduce to zero upon application of a selected clamping force on the end members, thereby limiting deformation of the outer collars.

A tamper-resistant coupling collar is provided. The tamper-resistant coupling collar may be configured to couple an air pulse generating unit to the coupler of a container that contains a liquid to be mixed by introducing an air pulse from the air pulse generating unit. The collar may include a flange portion and body portion, and the flange portion may include a plurality of holes configured to receive fasteners to couple the collar to the air pulse generating unit.

Apparatus for determining and/or monitoring at least one physical or chemical process variable of a medium in a containment comprising at least one sensor element, at least one housing module and at least one flange, wherein the sensor element and the flange are connected with the housing module, wherein the flange in a first portion, which is at least partially media contacting, is manufactured at least partially of a first material, which is selected application specifically, and wherein the flange in a second portion, which is at least partially environment contacting, is manufactured at least partially of a synthetic material.

A duct system with multiple flex duct sections includes a duct take off, a duct register boot, at least one flexible duct assembly that includes an inlet coupler, an outlet coupler, and a duct section. The inlet coupler and outlet coupler are terminally connected to the duct section completing the flexible duct assembly as the number of duct assemblies determines the length of the duct system. The duct takeoff is mounted to the inlet coupler, and the duct register boot is mounted to the outlet coupler as the duct takeoff is in fluid communication with the duct register boot through the flexible duct assembly. Additionally, an air controlling device can be mounted with respect to three different places, wherein the three different places are in between two couplers, the coupler and the duct takeoff, and the duct register boot and the coupler to improve the efficiency of the duct system.