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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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Presentation Transcript
hand held stream evolution
Hand Held Stream Evolution...
  • 1960’s & 70’s
  • Automatic pressure regulating nozzles invented
automatic nozzle benefits
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
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
comparison of reaction @ 150 gpm

Nozzle Reaction

Nozzle Pressure

75 psi 67.5 lb/f

100 psi 79.2 lb/f

125 psi 88.5 lb/f

150 psi 97.2 lb/f

Comparison of [email protected] 150 GPM
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