First, the product description PHYM series pressure proportioning device consists of a pressure tank, capsules, proportioner, safety valve, check valve, pressure gauge, check valve and piping components. Water supplied by the pump pressure, the foam liquid by mixing with water into foam mixture device, due to capsule separates foam liquid with water, foam liquid did not run again, next time you can continue to use, and mixing accuracy and stability, reliable. Second, the principle ??? When the pressure is part of the water flowing through the proportioner pressure water (3% -6%) from the manifold into the foam concentrate tank squeeze capsules, the replacement of foam liquid with another part of the same amount of water (97 % -94%) mixed into the foam mixture in the mixer proportional to the bubble generating means for generating an air bubble out the fire. Three dimensions