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Valve Design

Valve Design. Nozzleman Flow Control... Why is it important in fire ground operations?. Nozzleman Flow Control Benefits. Ability for nozzle operator to change flow on demand Nozzle has ability to adjust to new flow setting by itself Is simple and easy ... like a car’s gas pedal

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Valve Design

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  1. Valve Design Nozzleman Flow Control... Why is it important in fire ground operations?

  2. Nozzleman Flow Control Benefits... • Ability for nozzle operator to change flow on demand • Nozzle has ability to adjust to new flow setting by itself • Is simple and easy... like a car’s gas pedal • Does not affect stream reach (other than flow change) • Does not affect stream quality

  3. What Flow Control is NOT! • Changing the nozzle opening manually This requires change in pump pressure • Calling pump operator to change pressure ?? psi • Gating a ball valve to reduce flow • Anything that does not react instantly to provide a change in the flow

  4. Difference in Valve Designs Slide Valve Design Ball Valve Design

  5. Ball Valve Design (Valve gated half way)

  6. Primary Advantages of Ball Valve... • Simple and familiar design • Easily serviced by repair people with commonly available parts • Can be used in break-apart nozzle configurations

  7. Disadvantages of Ball Valve... • Designed to be used fully opened or closed • Creates turbulence when partially open • Seats require regular replacement • Difficult to open under pressure • Valve seal area in normal direct water path • Can bind and tighten with age

  8. Slide Valve Design (Valve gated half way)

  9. Primary Advantages of a Slide Valve... • Does NOT create turbulence when “throttled” • Is smoother and easier to open under pressure • Requires little to no maintenance • No seats to replace • Has greater durability • Valve seal area not in direct water path • Does not bind or tighten with age

  10. Disadvantages of a Slide Valve... • Moves more easily than a ball valve which increases possibility of accidental movement of valve (without detents) • Is not commonly familiar to field repair personnel • Design does not work well with break-apart nozzle and valve combinations • Can be more expensive than a ball valve

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