A ventilation system is operable to ventilate gases from an enclosed building. The ventilation system broadly includes a ventilation tube, a ventilation fan, and a flexible flow-through coupler. The tube is operable to extend into and out of the building for transmitting gases along the length of the tube. The fan is in fluid communication with the ventilation tube and is located to pump gases along the tube length. The coupler connects and fluidly communicates the fan to the ventilation tube, with the flexible coupler isolating at least part of the ventilation tube from vibration caused by the fan. The coupler comprises a flexible material with a Shore A hardness less than about 50.

Wearable rubber parts for fluid handling systems include a four layer structure, wherein the inner most layer of the four layer structure is a polyurethane layer. The polyurethane can be millable polyurethane. The polyurethane used in the inner most layer can be produced by reacting diisolcyanate with a polyester and/or polyether polyols and a chain extender. The wearable rubber part can be an expansion joint, a pinch valve, or a hose.

Wearable rubber parts for fluid handling systems include a four layer structure, wherein the inner most layer of the four layer structure is a polyurethane layer. The polyurethane can be millable polyurethane. The polyurethane used in the inner most layer can be produced by reacting diisolcyanate with a polyester and/or polyether polyols and a chain extender. The wearable rubber part can be an expansion joint, a pinch valve, or a hose.

A pulsation damper configured to reduce pressure peaks in a pipe system. The pulsation damper comprises an elastic pipe section arranged to be in a small volume state or a large volume state. A first volume held in the elastic pipe section in the large volume state is greater than a second volume held in the elastic pipe section in the small volume state. The elastic pipe section has an elliptical cross section in the small volume state. A ratio between a major axis and a minor axis of the elastic pipe section is in the range 1,05 to 10,0, such as 1,1 to 1,5.

A tube wave reduction system for a borehole includes a tubular member; one or more openings in the tubular member, the one or more openings having a through-passage and a deformation region surrounding the through-passage; and an absorber in fluid communication with the one or more openings. Also included is a method for reducing an effect of a tube wave.

The current invention comprises a flexible conduit means for an exhaust system of a combustion engine vehicle, comprising a bellows member (2), an outer flexible braided or knitted member (3) enclosing the bellows member, a resilient member (4), that is elastically deformable and encloses the outer braided or knitted member at least partially and abuts against it, whereas the bellows member comprises two corrugated portions (21), a connecting portion (24) between the corrugated portions, and the resilient member (4) encloses the connecting portion at least partially, the connecting portion (24) comprises flanks (25) that are formed at its axial ends and extend at least in a radial direction, and a curved portion (26) which connects the flanks with each other and which is at least partially enclosed by the resilient member (4).

A fastening device for fastening an elastic hang-on part for hanging at least a part of an exhaust system on a motor vehicle is provided. The fastening device includes a flange part having a first holding pin, and a mounting part having a second holding pin, wherein the first holding pin and the second holding pin are adapted to, together, hold the elastic hang-on part, wherein the flange part includes a first side portion and a flange plate, wherein the first holding pin extends substantially perpendicular away from the first side portion and the flange plate extends substantially perpendicular in the same direction as the first holding pin away from the first side portion, and wherein the mounting part includes a second side portion and a mounting plate.

The current invention comprises a flexible conduit means for an exhaust system of a combustion engine vehicle, comprising a bellows member (2), an outer flexible braided or knitted member (3) enclosing the bellows member, a resilient member (4), that is elastically deformable and encloses the outer braided or knitted member at least partially and abuts against it, whereas the bellows member comprises two corrugated portions (21), a connecting portion (24) between the corrugated portions, and the resilient member (4) encloses the connecting portion at least partially, the connecting portion (24) comprises flanks (25) that are formed at its axial ends and extend at least in a radial direction, and a curved portion (26) which connects the flanks with each other and which is at least partially enclosed by the resilient member (4).

A duct element for the exhaust system of a motor vehicle with an internal combustion engine, including at least one flexible duct part, preferably a bellows. The flexible duct part is embodied at least partially from a first type of steel with a Mo-content 4% or 6% and with a N-content from 0.3% to 0.6% or from 0.18% to 0.25%, preferably embodied from steel of the type 1.4565 or the type 1.4547. Furthermore a decoupling element is provided for motor vehicles with an internal combustion engine and a respective use of steel embodied with a Mo-content 4% or 6% and a N-content from 0.3% to 0.6% or from 0.18% to 0.25%, preferably steel of the type 1.4565 or 1.4547.

In an uncoupling element for uncoupling vibrations of the turbocharger of an internal combustion engine from an exhaust system with a bellows, provisions are made, especially for achieving a lower stiffness with short overall length, for the bellows to be a diaphragm bellows.