National Foam handline proportioners are venturi devices that introduce foam concentrate into a flowing stream of water at a controlled rate of either 1%, 3% or 6%. As water flows through the venturi (water orifice) at a high velocity, a negative pressure area develops at the discharge of the venturi. Handline proportioners are designed for hose line applications.
| Make | National Foam |
|---|---|
| Manufacturer | Kidde Fire Fighting (National Foam) |
| Model code | HLP-6 |
| Additional info |
National Foam handline proportioners are venturi devices that introduce foam concentrate into a flowing stream of water at a controlled rate of either 1%, 3% or 6%. As water flows through the venturi (water orifice) at a high velocity, a negative pressure area develops at the discharge of the venturi. Handline proportioners are designed for hose line applications. |