US 7,320,340 B2
Fluid pressure reduction devices
Donald Ray Bush, Marshalltown, Iowa (US); and Raymond W. Micheel, Gilman, Iowa (US)
Assigned to Fisher Controls International LLC, St. Louis, Mo. (US)
Filed on Mar. 26, 2004, as Appl. No. 10/810,003.
Prior Publication US 2005/0211321 A1, Sep. 29, 2005
Int. Cl. F15D 1/00 (2006.01)
U.S. Cl. 138—42  [138/43] 35 Claims
OG exemplary drawing
 
1. A fluid pressure reduction device comprising:
a first cylinder having a first inner surface, a first outer surface, and a first plurality of apertures extending from the first inner surface to the first outer surface; and
a second cylinder disposed within the first cylinder and having a second inner surface, a second outer surface, and a second plurality of apertures extending from the second inner surface to the second outer surface, wherein a substantial portion of the first inner surface is in contact with a substantial portion of the second outer surface, and wherein at least portions of the first plurality of apertures overlap at least portions of the second plurality of apertures, wherein the first plurality of apertures of the first cylinder and the second plurality of apertures of the second cylinder are configured such that a radial fluid flow at the first inner surface is split into at least two axial fluid flows that are channeled into adjacent radial flow paths which, upon approaching the second inner surface, are channeled into axial flows and mixed with axial flow from an adjacent radial fluid flow.