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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


Hand Held Stream Evolution...

  • 1960’s & 70’s

  • Automatic pressure regulating nozzles invented


Pressure Regulation Concept


How Does Pressure Regulation Work?


Pressure Stays Constant asFlow Changes


Baffle Opens as Flow Increases


Nozzle PressureAutomatic & Fixed Flow Nozzles


Automatic Master Stream Nozzle


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)


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


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


Nozzle Pressure, Reaction, & Flow Automatic Nozzles


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