Foam machine PP MK2 series

Each proportioner consists of a cast bronze body, metering orifice, bronze pressure balancing valve, and pressure sensing tubing. The proportioner is available in six standard sizes ranging from DN 50 to DN 250 with flows ranging from 125 Lpm to 37,850 Lpm (33 gpm to 10,000 gpm) and is designed to fit between two DIN PN16 (ANSI Class 150) pipe flanges. A minimum of five pipe diameters of straight pipe is necessary upstream and three pipe diameters downstream of the proportioner. SKUM PP MK2 proportioning devices function by maintaining equal pressures in the foam concentrate and water inlets into the proportioner. This ability to balance allows the propor tioner to be used over a wide range of flows and pressures. The system also responds quickly and accurately to changes in the water inlet pressures and flow rates. Positive displacement foam pumps for non-Newtonian foam concentrates or centrifugal foam pumps for AFFF and HiEx foams, are used to pressurize foam concentrate within the supply manifold. The foam pressure shall be a minimum of 1 bar to 2 bar (14.5 psi to 29 psi) higher than the water pres sure. Where required, a pressure control valve located in the return line to the foam concentrate storage tank, maintains a regulated pressure in the supply manifold at a minimum of 1 bar to 2 bar (14.5 psi to 29 psi) higher than the maximum pressure in the water supply line. Foam concentrate not required by the proportioner, then returns to the atmospheric storage tank through the pressure control valve.