Diamond Doser Water Driven Proportioner

A Diamond Doser water-driven proportioner is a mechanical chemical injection system enabling automated metering of foam concentrate into water streams without requiring electric power enabling deployment across remote locations and mobile firefighting operations. The water-driven mechanism provides reliable operation across decades without maintenance dependency on external electrical infrastructure.

The proportioner architecture employs water pressure differential across an internal restriction creating suction drawing foam concentrate from storage reservoir into the water stream at proportional rates. Venturi effect creates low-pressure zone drawing concentrate into flowing water achieving thorough mixing. Adjustment mechanisms enable selection of concentration ratios (typically 0.5–3% concentrate) matching specific foam formulation requirements and fuel type.

Operational integration into fire apparatus water delivery systems occurs at discharge manifold enabling proportional foam application at monitor nozzles or deck guns. Simple installation eliminates complex hydraulic or electrical modifications required for power-driven proportioners. Mechanical simplicity ensures continued operation despite sand, salt, or debris contamination potentially disabling electronic systems.

Flow rate capacity typically spans 100–500 GPM (gallons per minute) enabling deployment across portable hand-line systems through large fixed installations. Durability across decades of operation enables amortisation across extended service life reducing cost per application.

Limitations include lack of precise concentration control compared to electronically-modulated proportioners and inability to remotely adjust proportions during operation requiring manual adjustment at installation.

In Pakistan, foam proportioners support military and civilian firefighting operations.

Tactical Supply Pakistan supplies Diamond Doser water-driven proportioners for foam fire suppression applications.