Proportioning Equipment introduces the foam concentrate into a flowing stream of water to produce a foam solution. There are many methods of proportioning, but fixed foam systems typically use balanced pressure proportioning equipment. All balanced pressure systems use a modified venturi device called a proportioner or ratio controller.
Proportioners are available in a variety of sizes and styles to match required flow ranges and pipe sizes. Each proportioner consists of a body, inlet nozzle, and metering orifice—all of which are corrosion-resistant brass.
Proportioners are UL listed and FM approved with certain foam concentrates and used in conjunction with bladder tanks and pump proportioning skids. Typical applications include flammable liquid storage tanks, loading racks, aircraft hangars, heliports, and anywhere flammable liquids are used, stored, processed or transported.
Additional Product Information
Balanced pressure proportioning systems require the foam concentrate pressure to be balanced with the water pressure at the proportioner inlets.
The balanced pressure that exists between the foam concentrate and the flowing water is achieved through the use of a bladder tank or pump skid. The modified venturi device creates the pressure difference required to allow the foam concentrate to meter into the water stream.
At the concentrate inlet, a metering orifice regulates the rate of concentrate flow, determining the percentage of concentrate in the foam solution. Proportioners are specifically designed to accurately proportion and control the mixing of pressurized foam concentrates into a water stream with minimum pressure loss.
The proportioner body is designed with a female NPT threaded inlet and a male NPT threaded outlet in sizes of 2 or 2 ½ inches. Clearly marked on the proportioner body are the flow direction arrow, as well as the type and percentage of concentrate for which the proportioner was designed.
The proportioner body is designed in four sizes to fit between 3 in., 4 in., 6 in., or 8 in. pipe flanges. Clearly marked on the proportioner body are the flow direction arrow, as well as the type and percentage of concentrate for which the proportioner was designed.
The proportioner body is designed with flat-faced flanges to match ANSI 150 lb flanges of the same nominal size. Clearly marked on the proportioner body are the flow direction arrow, as well as the type and percentage of concentrate for which the proportioner was designed.
FLOWMAX CL Variable Range Proportioner
The proportioner is designed to proportion and control the mixing of the foam concentrate into a water stream over a wide range of water flow rates and pressures. With the low flow capability, this proportioner is suited for closed head foam-water sprinkler applications where the system flow starts low and increases as more sprinklers open if the fire intensifies. The FLOWMAX CL proportioner is used only with bladder tank systems and can be located up to 35 equivalent ft (10.7 m) from the bladder tank outlet. It has the capability to proportion foam concentrate at flow rates between 25 to 3000 gpm (95 to 11,356 Lpm) at a maximum working pressure of 250 psi (17.2 bar).