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Automatic Nozzles PowerPoint PPT Presentation


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Automatic Nozzles. Hand Held Stream Evolution. 1960’s & 70’s Automatic pressure regulating nozzles invented. Pressure Regulation Concept. How Does Pressure Regulation Work?. Pressure Stays Constant as Flow Changes. Baffle Opens as Flow Increases.

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Automatic Nozzles

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Automatic nozzles l.jpg

Automatic Nozzles


Hand held stream evolution l.jpg

Hand Held Stream Evolution...

  • 1960’s & 70’s

  • Automatic pressure regulating nozzles invented


Pressure regulation concept l.jpg

Pressure Regulation Concept


How does pressure regulation work l.jpg

How Does Pressure Regulation Work?


Pressure stays constant as flow changes l.jpg

Pressure Stays Constant asFlow Changes


Baffle opens as flow increases l.jpg

Baffle Opens as Flow Increases


Nozzle pressure automatic fixed flow nozzles l.jpg

Nozzle PressureAutomatic & Fixed Flow Nozzles


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Automatic Master Stream Nozzle


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Automatic Nozzle Benefits...

  • Consistent hard-hitting streams

  • Correct nozzle pressure with available flow

  • Maximum reach with available water

  • Able to adjust to varying water supply conditions

  • Nozzle reaction is a direct indication of flow

  • Nozzle flow control (with slide valve)


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Disadvantages of Automatic Nozzles...

  • Higher initial cost

  • Design unfamiliar to repair personnel

  • May not provide adequate water at extremely low pressures

  • Stream may look good, but may not be providing adequate water for extinguishment or protection

  • The need for a Standard Operating Guideline for minimum pump pressures


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Nozzle Reaction

Nozzle Pressure

75 psi 67.5 lb/f

100 psi79.2 lb/f

125 psi88.5 lb/f

150 psi97.2 lb/f

Comparison of Reaction@ 150 GPM


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Nozzle Pressure, Reaction, & Flow Automatic Nozzles


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