ADJUSTABLE SMOOTH BORE NOZZLE

1 . An adjustable nozzle comprising:

a nozzle body having a longitudinal central axis, a first body portion, and a second body portion in fluid communication with said first body portion, said first body portion forming an inlet and having a fixed inner diameter, said second body portion forming an outlet and having a flexible membrane forming a bladder;

a nozzle coupler mounted to said nozzle body for mounting said nozzle body to a fire suppressant supply; and

a tip mounted to said nozzle body at said first body portion and extending along said second body portion and being spaced from said bladder over at least a portion of said bladder wherein said bladder is expandable in said tip.

2 . The adjustable nozzle according to claim 1 , wherein said second body portion includes a compressible wall between said tip and said bladder.

3 . The adjustable nozzle according to claim 2 , wherein said tip comprises a conical-shaped tip tapered from said first body portion to said outlet, said tip threaded onto said first body portion on one end and contacting said compressible wall with an opposed end and compressing said compressible wall when retracted onto said first body portion.

4 . The adjustable nozzle according to claim 3 , wherein said tip includes an inwardly projecting shoulder at said opposed end, said shoulder contacting said compressible wall and compressing said compressible wall when said tip is retracted onto said first body portion.

5 . The adjustable nozzle according to claim 4 , wherein said compressible wall comprises a plurality of spaced beams, said beams extending along said central axis and flexing inwardly when compressed by said shoulder to thereby reduce the inner dimension of said passageway.

6 . The adjustable nozzle according to claim 2 , wherein said compressible wall includes an inner surface, said bladder being spaced from said inner surface when in an unpressurized configuration and expanding in response to fluid pressure in said passageway into a pressurized configuration, when in said pressurized configuration said bladder is compressible and can maintain a smooth inner surface when compressed by said compressible wall.

7 . A method of controlling a fluid flow through a nozzle, said method comprising:

providing an adjustable nozzle comprising a nozzle body having a longitudinal central axis, an inlet, and an outlet;

providing a flexible membrane;

positioning the membrane in the nozzle body;

sizing the membrane such that it is spaced radially inwardly from the nozzle body;

coupling the nozzle body to a fire suppressant supply;

directing a pressurized fluid through the membrane wherein the membrane is biased in an expanded configuration; and

compressing the membrane when in the expanded configuration to a less expanded or an unexpanded configuration to adjust the flow of fluid from the nozzle.

8 . The method of claim 7 , further comprising:

inserting a compressible wall between the membrane and the nozzle body; and

compressing the membrane with the compressible wall.

9 . The method of claim 8 , further comprising:

forming a plurality of beams in the compressible wall, wherein the beams compress the membrane.

10 . The method of claim 9 , further comprising:

preventing the membrane from extruding between the plurality of beams.

11 . The method of claim 10 , wherein said step of preventing the membrane from extruding further comprises:

inserting a compressible sleeve between the membrane and the compressible wall.

12 . An adjustable nozzle comprising:

a nozzle body having a longitudinal central axis, an inlet, and an outlet; and

a flexible membrane mounted such that it is spaced radially inwardly from the nozzle body to form a hollow space between the membrane and the nozzle body;

wherein directing a first pressurized fluid through the membrane biases the membrane to an expanded configuration, and wherein the hollow space is pressurizable to adjust the flow of fluid from the nozzle.

13 . The adjustable nozzle of claim 12 , wherein directing a second pressurized fluid into the hollow space compresses the membrane when in the expanded configuration to a less expanded or an unexpanded configuration to adjust the flow of fluid from the nozzle.

14 . The adjustable nozzle of claim 13 , wherein the membrane can maintain a smooth inner surface when compressed by the second pressurized fluid.

15 . The adjustable nozzle of claim 12 , wherein directing a second pressurized fluid out of the hollow space biases the membrane from an unexpanded configuration or a less expanded configuration to the expanded configuration or a more expanded configuration to adjust the flow of fluid from the nozzle.

16 . The adjustable nozzle of claim 12 , wherein the membrane comprises rubber.

17 . The adjustable nozzle of claim 12 , wherein the nozzle body is coupled to a fire suppressant supply.

18 . A method of controlling a fluid flow through a nozzle, said method comprising:

providing an adjustable nozzle comprising a longitudinal central axis, an inlet, and an outlet;

providing a flexible membrane;

sizing the membrane such that it is spaced radially inwardly from the nozzle body to form a hollow space between the membrane and the nozzle body; and

directing a first pressurized fluid through the membrane wherein the membrane is biased to an expanded configuration.

19 . The method of claim 18 , further comprising:

directing a second pressurized fluid into the hollow space wherein the membrane is compressed to a less expanded or an unexpanded configuration to adjust the flow of fluid from the nozzle.

20 . The method of claim 19 , further comprising:

directing the second pressurized fluid out of the hollow space wherein the membrane is biased to the less expanded or the expanded configuration.