A heating, ventilation, and air-conditioning (HVAC) duct system which includes, at least in part, one or more modular, uniform, pre-manufactured duct elbow elements having two faces of two sizes. Each elbow provides a twenty-two and a half degree (22.5°) bend in a duct system. When combined, the elbow sections can provide forty-five (45°) degree bends or ninety (90°) degree bends, or even offsets within a duct system. Due to the size and shape of the elbows, multiple elbows can be nested within one another for easy packing and shipping.

A coin handling apparatus having: a first coin position; a second coin position; and a pipe for transporting coins from the first to the second coin position. The pipe is jointed and has a rigid, elongate element having a straight, elongate portion and a curved portion at a first end of the straight, elongate portion. The pipe further includes a rigid, curved element. The curved portion and the curved element are connected to define a continuous passageway through the curved element and the elongate element. The curved element, at least before mounting of the pipe in the coin handling apparatus, is rotatable in relation to the elongate element, such that an angle between a first opening of the curved element and a direction extending along the straight elongate portion is variable.

A coin handling apparatus having: a first coin position; a second coin position; and a pipe for transporting coins from the first to the second coin position. The pipe is jointed and has a rigid, elongate element having a straight, elongate portion and a curved portion at a first end of the straight, elongate portion. The pipe further includes a rigid, curved element. The curved portion and the curved element are connected to define a continuous passageway through the curved element and the elongate element. The curved element, at least before mounting of the pipe in the coin handling apparatus, is rotatable in relation to the elongate element, such that an angle between a first opening of the curved element and a direction extending along the straight elongate portion is variable.

A low-pressure tubular system, for instance a vacuum tube train transportation system, comprising: a multitude of interconnected tube sections having a longitudinal axis; wherein each of the tube sections comprise a central part and two outer end parts; wherein the tubular system is configured to maintain a low-pressure environment within the connected tube sections; wherein the system further comprises a multitude of expansion joints connecting the tube sections; wherein each of the expansion joints comprises a sleeve made of a flexible sheet material and comprising a ring shaped endless central part and two ring shaped endless outer end parts; and wherein each of the outer end parts of the expansion joints are arranged to extend coaxial with an adjacent tube section and surround and sealingly engage the outer end part of said adjacent tube section.

A low-pressure tubular system, for instance a vacuum tube train transportation system, comprising: a multitude of interconnected tube sections having a longitudinal axis; wherein each of the tube sections comprise a central part and two outer end parts; wherein the tubular system is configured to maintain a low-pressure environment within the connected tube sections; wherein the system further comprises a multitude of expansion joints connecting the tube sections; wherein each of the expansion joints comprises a sleeve made of a flexible sheet material and comprising a ring shaped endless central part and two ring shaped endless outer end parts; and wherein each of the outer end parts of the expansion joints are arranged to extend coaxial with an adjacent tube section and surround and sealingly engage the outer end part of said adjacent tube section.

A fracturing manifold system includes a first manifold assembly in a side-by-side arrangement with a second manifold assembly. The first manifold assembly includes a plurality of first junctions, each having multiple inlet ports facing a first side of the fracturing manifold system. The second manifold assembly includes a plurality of second junction, each having multiple inlet ports facing a second side of the fracturing manifold assembly. Inlet ports on a single junction may be angled relative to each. The inlet ports may also be angled relative to a manifold flow path.

A pipeline including at least first and second portions, each comprising outer and inner pipes, at least one coupling system connecting the first and second portions and including at least a downstream flange ring connected to at least one of the outer and inner pipes of the first portion, at least an upstream flange ring connected to at least one of the outer and inner pipes of the second portion, connecting elements connecting the upstream and downstream flange rings, first and second annular seals interposed between the upstream and downstream flange rings and configured to delimit, with the upstream and downstream flange rings, a buffer space containing an atmosphere, the pipeline comprising at least one leak detection system configured to determine at least one characteristic of the atmosphere of the buffer space.

An adjustable drain assembly is disclosed. The adjustable drain assembly may have a main drain body with a series of springable flanges and extension calibration elements. Other components of the adjustable drain assembly may provide fluid conduits from various drains, such as of a bath tub, and may connect to the main drain body. These other components may be insertable into the springable flanges and may have extension calibration elements interlockable with the extension calibration elements of the main body. A collet may be disposable about the springable flanges and configured to retain the extension calibration elements in fixed interlocking relation. In this manner, the other components may be adjustably positioned in lengthwise relation relative to the main drain body, then secured in position by the fixation of the extension calibration elements in fixed interlocking relation.

A vacuum inlet valve assembly has a housing configured to be mounted exterior to a preexisting wall in a structure such that the housing is connected with a conduit and the conduit is exterior to the wall and retains a hose therein, and the hose is adapted to be pulled out from a stored position within the conduit external from the wall to an extracted position, and when in the extracted position, an end cap or hose plug on the hose is releasably connected with a connection assembly in the housing. A portion of the conduit is clear or translucent or transparent so an operator can watch the end cap or hose plug approach the connection assembly.

A transfer tube assembly comprises a transfer tube slidably engaged in sealing engagement with a first component. The transfer tube has a shoulder engageable with a stopper for limiting relative axial movement between the transfer tube and the first component. The shoulder has an abutment surface facing a corresponding bore surface of the first bore of the first component. The abutment surface and the bore surface are configured to generate axially opposing reaction forces in response to the abutment surface and the bore surface contacting each other.