The present invention provides a piping system (1) at least comprising a main pipeline (2) and a side branch pipeline (3), wherein the side branch pipeline (3) meets the main pipeline (2) at a junction (4), wherein the side branch pipeline (3) is provided with a perforated plate (5) having a plurality of perforations (6), wherein the perforated plate (5) has a downstream half (5B) and an upstream half (5A) (relative to the flow direction in the main pipeline (2)), wherein the downstream half (5B) has less open area than the upstream half (5A), and wherein the perforated plate (5) is provided with a protrusion (8), at the side of the perforated plate (5) facing away from the junction (4).

A bypass line is described that is capable of equalizing pressure within an HVAC system. The bypass line can also cause less noise than other solutions. A bypass line under the present disclosure can comprise a line from a high pressure side to a low pressure side of an HVAC system. Valves and orifices can be disposed within the bypass line. The valves and orifices help to slow the speed of fluid from high pressure to low pressure locations, thus reducing noise during pressure equalization.

A fluid flow restrictor device for controlling fluid flow at a connection between ducts may include a restrictor device body that is partially or fully inserted into and disposed within one of the ducts and an outboard restrictor device flange extending radially outward at an outboard end of the restrictor device body and having an outboard flange outer diameter that is greater than an inner diameter of the ducts so that the restrictor device body or the outboard restrictor device flange is engaged by an open end surface of the duct to prevent full insertion of the fluid flow restrictor device into the duct. A body inner surface defines a restrictor opening through the restrictor device body that can be varied to achieve desired fluid flow characteristics at the connection.

Plates and plate assemblies for noise attenuators and other devices and methods of making the same are described herein. An example disc-shaped plate described herein includes a plurality of sector-shaped plates that have openings defining flow paths. Each of the plurality of sector-shaped plates has a first radial edge forming a first mating feature and a second radial edge forming a second mating feature that is complementary to the first mating feature such that, when the plurality of sector-shaped plates are arranged together, the first mating feature of each of the plurality of sector-shaped plates mates with the second mating feature of an adjacent one of the plurality of sector-shaped plates.

Plates and plate assemblies for noise attenuators and other devices and methods of making the same are described herein. An example plate assembly includes a support frame to be coupled to a body of the noise attenuator. The support frame has a plurality of radially extending ribs. The plate assembly also includes a disc-shaped plate having a plurality of openings forming flow paths to attenuate noise. The disc-shaped plate is coupled to the support frame such that pressure-induced loads on the disc-shaped plate are distributed to the plurality of radially extending ribs of the support frame.

Implementations of an orifice plate configured to regulate a fluid flow are provided. An example orifice plate is configured to be positioned in a conduit and comprises a plurality of holes that extend therethrough. The plurality of holes are arranged to form one or more spiral layouts. Each spiral layout consists of a series of holes configured to regulate a fluid flow passing therethrough. In some implementations, the spiral layout is a logarithmic spiral having a growth factor of substantially 1.618 for each quarter turn. Another example orifice plate comprises a plurality of holes arranged to form a criss-crossing pattern of spiral layouts. The number of clockwise spiral layouts is a Fibonacci number and the number of counter-clockwise spiral layouts is a Fibonacci number. In some implementations, each hole in an orifice plate has a contoured conical shape wherein the inlet has a larger diameter than the outlet.

To inhibit damage to or failure of the bladder within a bladder-type pulsation dampener, an internal passage of a bladder saver device carrying pumped fluid from the pulsation bleed plate mounted within the internal passage and movable between a first position in which the pulsated fluid flow is unencumbered by the bleed plate and a second position in which the pulsated fluid flow is restricted by the bleed plate.

A fluid flow restrictor device for controlling fluid flow at a connection between ducts may include a restrictor device body that is partially or fully inserted into and disposed within one of the ducts and an outboard restrictor device flange extending radially outward at an outboard end of the restrictor device body and having an outboard flange outer diameter that is greater than an inner diameter of the ducts so that the restrictor device body or the outboard restrictor device flange is engaged by an open end surface of the duct to prevent full insertion of the fluid flow restrictor device into the duct. A body inner surface defines a restrictor opening through the restrictor device body that can be varied to achieve desired fluid flow characteristics at the connection.

There is a valve assembly including a flow control valve and a flow centralizer. The flow centralizer has a flowthrough bore. The flow centralizer is downstream of the flow control valve and the flowthrough bore narrows in a direction downstream of the flow control valve. The flow centralizer may have a three-piece design including an insert defining the flowthrough bore and an orifice body and a flange ring which hold the insert in place within the orifice body.

A flow resistance insert of a flow rate measuring or flow rate control has contiguous discs between which at least one central axial flow duct is formed from which radial flow ducts branch off. The discs include alternating first discs and second discs. While the first discs are circumferentially closed ring discs, the second discs are circumferentially slotted one-piece ring discs. A flow rate measuring or flow rate control is furthermore described.