The working principle and characteristics of pressure foam proportioning device works 1, PHYM tank capsule built by proportioner set of equipment, steel tank, capsule, into the water system, the fluid lines, check valves, safety valves, control valves, pressure gauges, exhaust systems and piping components. Mixers can automatically mix a certain proportion of water and foam concentrate. When the pressure of the water through the proportioner, part of the water through the "inlet valve" pipeline into the tank water chamber, squeezing capsules, because slight pressure around the nozzle, so that the foam liquid through the pipette capsule is extruded mixed with water to become foam mixture flows through the foam generator or other injection equipment spray foam for fire fighting work. Features: inside the tank there is a capsule made of rubber, so that water and foam liquid separated after each use, the tank of water and foam concentrate can be mixed and did not keep the original performance of the same foam solution, you can continue to use, to avoid waste foam concentrate. 2, within the PHY tank without capsule whole equipment by proportional mixer, steel tank, into the water system, the fluid lines, check valves, safety valves, control valves, pressure gauges, exhaust systems and piping components. Mixers can automatically mix a certain proportion of water and foam concentrate. When fire water through proportioner, some of the water through the "inlet valve" pipe into the tank chamber, extrusion foam liquid, because slight pressure around the nozzle, making foam liquid is extruded through a pipette mixed with water become foam mixture flows through the air bubble generator or other injection equipment spray foam for fire fighting work. Features: No capsule inside the tank, the water enters the tank, in direct contact with the liquid and foam. After each use, the tank should be full of water and foam liquid drain, rinse the tank wall, dry, and re-filled with foam liquid and set aside. Loss caused by rupture of the capsule is not present. Applies to energy and metals in direct contact with foam concentrate tank. Pressure and flow range conditions and mixing device supporting fire pump, mixing device must be within the specified performance requirements. Mixing device must be within the specified operating pressure range and flow range, otherwise it will affect the mixing ratio, lower foam quality. Pressure within the specified size mixing device operating pressure range used, depending on the operating pressure and friction loss of the equivalent length of pipe is equipped with a foam fire extinguishing equipment, and hence, the use of the pipeline system to do the necessary calculations to determine the ratio of the mixing device installation location is appropriate, the selection is appropriate. After the instructions (see PHYM pressure foam proportioning device works Figure) 1, starting the fire pump and water pressure pipes, open the inlet valve 1, 2 and outlet valve inlet valve 3. 2, conditioning system outlet valve opening 2 so that the rated working pressure gauge shows foam proportioning device, and stabilize at a certain value. 3, when the inner pressure of the water entering the tank and the pressure raised to the working pressure, to open the fluid valve 4, foam concentrate and water are mixed pressure is automatically adjusted to 6% (or 3%) of the scale, and the system output began to foam mixture. 4, when the stop for the fluid, you should turn off the valve 4 (in order to avoid the pressure of water flowing back into the capsule), and then close the other valves, stop the pump at the same time, to stop working. 5, the initial perfusion liquid foam method: ⑴ shut-off valve 6, opening the valve 8, the valve 9, the valve 7. ⑵ open flange cover 5, are available to the rubber hand pump ⑶ bag filling foam liquid foam concentrate from the time when the overflow valve 7, can be considered liquid has been filled with foam. Shut-off valve 7. 6, to test the water, open the valve 8, valve 3, which leads to the pressure of water, when the exhaust valve 8 jet of water can be turned off, so that the tank is in the standing state. , Maintenance 1, always check whether the sealing flange covers, each valve actuation is flexible and reliable. 2, when the bubble liquid filling, the tank should be kept clean, not with oil or other liquid mixed foam should not be mixed with the aging of the foam solution used. 3, foam concentrate not allow direct sunlight and stored in a small space temperature difference, less contact with air. Where to store more than two years of bubble liquid before use sampling inspection, qualified before use. For the failure of the foam concentrate shall be updated. And replaced with new foam record date. 4, the capsule containing the tank should conduct a leak test every six months. Test method is to open the drain valve 9, if there is a bubble fluid leak, then prove detrimental capsules should be repaired or replaced. 5, when replacing the foam concentrate, make a deal with the fire extinguishing foam injection system simulation test to check the fire pump, foam proportioning equipment and generators and other equipment condition is normal and reliable, if an exception should be timely maintenance. 6, when the failure to replace the foam liquid, coping means comprehensive cleaning, washing capsule method is: ⑴ first put in to make the remaining foam liquid capsule, and then turn the water drain valve chamber 9, and then put the valve is turned on compressed air from the capsule 7 ( pressure 0.02 ~ 0.1MPa), open the lower tank drain valve 6, the inner capsule Chuijin foam residue. ⑵ shut-off valve 6, open valve 8, from 5 to oral dosing capsule filled with water to clean the inner surface of the capsule, and then open the valve 6, turn the water out of the compressed air from the valve 7, and continue to use compressed air blown three capsules ten minutes, thoroughly dry the moisture inside the capsule, refillable liquid foam.