A downdraft element having a first flow opening and a second flow opening, wherein the first flow opening is arranged relative to the second flow opening at an angle 45°≤α≤135°, preferably substantially of 90°, so that at least the average flow direction of a fluid entering the first flow opening and exiting the second flow opening or vice versa is deflectable, characterized in that the downdraft element comprises at least one damper material receptacle on an inner side between the first flow opening and the second flow opening and at least one damper inserted into the damper material receptacle. The invention further relates to a corresponding assembly.

A pipe bend, in particular for an exhaust air duct of a fume extraction hood, which has a deflection of 60° to 120°, preferably 90°, with an inflow side and an outflow side, wherein the pipe bend has at least one air guide element which is curved in deflection direction and which extends in the interior of the pipe bend, characterized in that the pipe bend has a cross-sectional widening in flow direction behind the inflow side, in particular adjacent thereto, and a cross-sectional tapering in front of the outflow side, in particular adjacent thereto, the course of the bend of the outer wall of the bend deviating from the course of a quarter circle and having a bulge lying outside the vertex of the bend, in particular downstream of the vertex in the direction of flow.

A pipe bend for an exhaust air duct of a fume extraction hood, the pipe bend having at least one multi-part and curved air guide element which extends in the interior of the pipe bend, characterized in that a first and a second part element of the air guide element have a spacing (d) from one another in a radial direction of their curvature.

A fairing, in the form of a contoured restriction, submerged on a fluid channel surface of a fluid channel through which liquid flows, re-distributes velocity fields and flow geometries upstream and in some embodiments downstream of a discontinuity, thereby preventing flow separation, reducing cavitation potential and increasing flow capacity. Such discontinuities include, but are not limited to: joints, for example elbow joints, T-joints and Y-joints; valve-trims; entrance regions to centrifugal pumps; and entrance regions to rotary valves, steps, reductions, expansions and ledges. The fairing may be fitted into the channel or integrally fabricated with the channel.

A fairing, in the form of a contoured restriction, submerged on a fluid channel surface of a fluid channel through which liquid flows, re-distributes velocity fields and flow geometries upstream and in some embodiments downstream of a discontinuity, thereby preventing flow separation, reducing cavitation potential and increasing flow capacity. Such discontinuities include, but are not limited to: joints, for example elbow joints, T-joints and Y-joints; valve-trims; entrance regions to centrifugal pumps; and entrance regions to rotary valves, steps, reductions, expansions and ledges. The fairing may be fitted into the channel or integrally fabricated with the channel.

An exhaust diffuser hub disposed at a longitudinal center of an exhaust diffuser is provided. The exhaust diffuser hub includes a hub extension extending from a downstream end thereof in a longitudinal direction of the exhaust diffuser. A transverse cross-sectional area of the hub extension is smaller than a transverse cross-sectional area of the hub.

An exhaust diffuser hub disposed at a longitudinal center of an exhaust diffuser is provided. The exhaust diffuser hub includes a hub extension extending from a downstream end thereof in a longitudinal direction of the exhaust diffuser. A transverse cross-sectional area of the hub extension is smaller than a transverse cross-sectional area of the hub.

Devices and methods to impart liquid into a pumping unit are described herein. Specifically, a vertical liquid intake is described which allows for diversion of liquid flow from horizontal to vertical without a loss of capacity or increased risk of cavitation. The liquid intake generally includes a body with separate channels and a removable cover.

Devices and methods to impart liquid into a pumping unit are described herein. Specifically, a vertical liquid intake is described which allows for diversion of liquid flow from horizontal to vertical without a loss of capacity or increased risk of cavitation. The liquid intake generally includes a body with separate channels and a removable cover.

An arcuate sweep elbow pipe connector section is disclosed as part of the piping system used to deliver water from a source to a fire sprinkler head. The arcuate sweep elbow pipe connector section is integrally formed at one end with a first connecting section and integrally formed at a section end with a second connection section. The connecting sections are positioned ninety degrees relative to each other and the arcuate sweep elbow pipe connector section optimizes water flow through both connecting sections.