Pipes and tubular conduits – With flow regulators and/or baffles – Restrictors
Reexamination Certificate
2005-04-19
2005-04-19
Bastianelli, John (Department: 3751)
Pipes and tubular conduits
With flow regulators and/or baffles
Restrictors
C251S118000, C239S461000, C239S590300
Reexamination Certificate
active
06880579
ABSTRACT:
A noise reduction device for use in a fluid flow system comprises a central section and an outer annular section. The outer annular section is designed to reduce the velocity of an annular fluid flow relative to a central core fluid flow. The central section of the device has a plurality of apertures, while the annular section has upstream apertures communicating with a pressure reduction chamber and downstream apertures. The upstream apertures of the annular section are smaller than, and off set from, the downstream apertures of an annular section to increase the pressure reduction and further reduce the velocity of the fluid flow in an annular section. A method is also described for reducing noise transmissions from a piping system wherein the fluid flow through the piping system is separated into an annular fluid flow and a core fluid flow, and the velocity of the annular fluid flow is reduced relative to the core fluid flow.
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Bastianelli John
Dresser, Inc.
Fish & Richardson P.C.
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