Ratio Controllers

Description

Ratio Controllers are modified venturi foam proportioners that accurately meter pressurized foam concentrate into the firewater stream.  These foam proportions are used in conjunction with balanced pressure systems, such as bladder tanks and pumped proportioning skids.  In operation, firewater flows through the modified venturi, creating an area of lower pressure, which is referred to as the “metering pressure drop”.  This metering pressure drop is directly affected by the firewater velocity as it flows through the venturi.  The (1%, 3% or 6%) concentrate-to-water ratio is maintained over the entire flow range of each size ratio controller.  However, each size ratio controller has a minimum flow rate/velocity requirement, and these minimums must be maintained for proper ratio controller operation.

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