Cascade orificial resistive device

Claim 1

A device for throttling a fluid flow while minimizing acoustic noise and internal vibrations which comprises: a hollow body having a fluid inlet, a fluid outlet and a fluid passageway therebetween; at least two perforated plates mounted in said fluid passageways for throttling a flow of fluid through said passageway; said at least two plates being arranged so that orifices in a first plate are selectively misaligned with respect to orifices in a second adjacent plate; each said plate being formed from an elastomeric material; means for joining said first and second plates together so that said orifices in said first plate are selectively misaligned with respect to said orifices in said second plate; said joining means comprising an integrally formed, partially cylindrical key member located centrally on one of said plates and a mating wedge shaped key member located centrally on the other of said plates; said partially cylindrical key member having first and second surfaces defining a first angle therebetween; said wedge shaped kay member having third and fourth surfaces defining a second angle which is substantially equal to said first angle; and said kay members forming a substantially cylindrical configuration when mated.

Claim 2

A device for throttling a fluid flow while minimizing acoustic noise and internal vibrations which comprises: a hollow body having a fluid inlet, a fluid outlet and a fluid passageway therebetween; at least two perforated plates mounted in said fluid passageways for throttling a flow of fluid through said passageway; said at least two plates being arranged so that orifices in a first plate are selectively misaligned with respect to orifices in a second adjacent plate; each said plate being formed from an elastomeric material; means for joining said first and second plates together so that said orifices in said first plate are selectively misaligned with respect to said orifices in said second plate; said joining means comprising an integrally formed, partially cylindrical key member located centrally on one of said plates and a mating wedge shaped key member located centrally on the other of said plates; said partially cylindrical key member having first and second surfaces defining a first angle therebetween; said wedge shaped kay member having third and fourth surfaces defining a second angle which is substantially equal to said first angle; and said kay members forming a substantially cylindrical configuration when mated.

Claim 8

A device for throttling a fluid flow while minimizing acoustic noise and internal vibrations which comprises: a hollow body having a fluid inlet, a fluid outlet and a fluid passageway therebetween; a plurality of perforated plates positioned within said fluid passageway for throttling a flow of fluid through said passageway; each said plate having a plurality of orifices therein and an integrally molded spacer ring; means for joining said plates together so that said orifices in any of said plates are misaligned with respect to the orifices in at least one adjacent plate; said joining means including an integrally formed key member centrally located on a first face of a first one of said plates and an integrally formed mating key member centrally located on a second face of a second one of said plates, said first face facing said second face, and said key members forming a substantially cylindrical configuration when mated; means for compressing said plate against each other so as to substantially avoid the production of noise and vibrations; said compressing means comprising a first end ring positioned within said hollow body and welded thereto at a desired location; said compressing means further comprising a second end ring positioned entirely within said hollow body and threadedly engaging a threaded portion of said hollow body; and said second end ring upon tightening deflecting all of said plates until all of said spacer rings are in contact with each other and said key members are in compression.

Claim 9

A device for throttling a fluid flow while minimizing acoustic noise and internal vibrations which comprises: a hollow body having a fluid inlet, a fluid outlet and a fluid passageway therebetween; a plurality of perforated plates positioned within said fluid passageway for throttling a flow of fluid through said passageway; each said plate having a plurality of orifices therein and an integrally molded spacer ring; means for joining said plates together so that said orifices in any of said plates are misaligned with respect to the orifices in at least one adjacent plate; said joining means including an integrally formed key member centrally located on a first face of a first one of said plates and an integrally formed mating key member centrally located on a second face of a second one of said plates, said first face facing said second face, and said key members forming a substantially cylindrical configuration when mated; means for compressing said plate against each other so as to substantially avoid the production of noise and vibrations; said compressing means comprising a first end ring positioned within said hollow body and welded thereto at a desired location; said compressing means further comprising a second end ring positioned entirely within said hollow body and threadedly engaging a threaded portion of said hollow body; and said second end ring upon tightening deflecting all of said plates until all of said spacer rings are in contact with each other and said key members are in compression.