Selectable fixed flow large scale fire fighting nozzle with selectable additive proportioning and light weight cost effective construction

1. A fire fighting nozzle having a selectively adjustable discharge gap and an independently selectable, gap coordinated additive proportioning system, the nozzle comprising:

nozzle elements defining a selectively adjustable discharge gap, the elements structured in combination such that the gap is selectively adjustable between a plurality of positions;

an additive passageway associated with the nozzle, the passageway defined in a path of fluid communication between a nozzle discharge and an additive source, the passageway selectively adjustable between at least four configurations, the configurations correlating at least two discharge gap positions with at least two additive proportioning ratios; and

wherein a selective adjustment of nozzle elements is independent of, but coordinated with, a selective adjustment of the additive passageway.

2. The nozzle of claim 1 wherein the selectively adjustable discharge gap is defined by relatively adjustable barrel and baffle elements.

3. The nozzle of claim 2 wherein a baffle element rotates and translates with respect to a barrel axis.

4. The nozzle of claim 3 wherein the rotating and translating baffle element includes a sleeve portion having a plurality of differently sized ports, the baffle element and the sleeve portion structured in combination such that as the baffle element rotates and translates with respect to a barrel axis, the sleeve rotates to interpose a differently sized port in an additive passageway.

5. The nozzle of claim 2 wherein a relative rotation of portions of the nozzle causes an adjustment of relative position between a barrel element and a baffle element.

6. The nozzle of claim 5 that includes a helical or spiral channel and a following lug or pin, each associated with one of a relatively rotating portion of the nozzle, such that the relative rotating causes the baffle element to translate.

7. The nozzle of claim 5 that includes a keyway and slot, each associated with one of the baffle element portion or a relatively rotating nozzle portion, such that rotation of a nozzle portion causes rotation of the keyway and slot and baffle element.

8. The nozzle of claim 1 wherein a relative rotation of portions of the nozzle causes an adjustment of an additive passageway.

9. The nozzle of claim 1 wherein the discharge gap has a diameter of at least 2½ inches and the nozzle has a flow rate of at least up to 250 gpm.

10. A method for discharging fire fighting fluid at a selectively adjustable flow rate and providing for independently selectable, gap coordinated additive proportioning, comprising

relatively adjusting nozzle elements to define one of a plurality of selectively adjustable discharge gaps, each gap coordinated with one of a plurality of selectable additive proportioning ratios;

adjusting an additive passageway, defined in a line of fluid communication between a nozzle discharge and an additive source, to one of at least four configurations, the configurations correlating at least two discharge gap positions with at least two additive proportioning ratios; and

wherein the relative adjusting of nozzle elements is coordinated with an adjustment of additive passageway and wherein discharge gap and additive proportioning ratios can be independently selected.

11. The method of claim 10 wherein relatively adjusting nozzle elements includes relatively adjusting a barrel element and a baffle element.

12. The method of claim 11 that includes helixing or spiraling a baffle element around a barrel axis.

13. The method of claim 11 that includes rotating a sleeve portion of the baffle element to interpose one of a plurality of orifices in an additive passageway independently selected.

14. The method of claim 10 wherein a discharge gap has a diameter of at least 2½ inches and that includes discharging fire fighting fluid at least up to 250 gpm.