Balanced foam proportioning device (dual motor)

PHP (W-L) balanced pressure foam proportioning device

In large-scale foam fire fighting projects in foam fire systems, there are higher requirements for the supply source of foam mixed liquid. The limited foam liquid supply volume of traditional tank pressure foam proportioning devices is increasingly unable to meet the requirements of modern large-scale foam fire fighting projects. The PHP series pump-in balanced pressure foam proportioning device (hereinafter referred to as PHP) is a new type of foam extinguishing device that provides foam mixed liquid to foam fire systems. It is mainly used in large and medium-sized foam fire systems such as petrochemical, port terminals, oil depots, airports (warehouses), and offshore platforms.

Application advantages

1. The use of atmospheric pressure, bag-free, stainless steel (or fiberglass, polyethylene) foam liquid storage tanks avoids the losses caused by capsule damage and the high pressure vessel manufacturing costs.

2. The device can be used with any foam extinguishing agent such as protein, fluoroprotein, and water-based film.

3. Foam liquid can be added during the device extinguishing process, especially suitable for large and medium-sized foam fire engineering.

4. The dynamic adjustment of the pressure balance valve ensures a more accurate mixing ratio.

5. The method of foam pump injection into foam liquid makes the working pressure and flow rate of foam mixed liquid have a larger adaptation range.

6. Easy to operate, easier to achieve automatic control.

7. If a water turbine is used for power, no power supply is required, and the device can also operate automatically, which belongs to an absolutely intrinsically safe type.

I. Working principle and basic composition:

When a fire occurs, some of the pressured water drives the water turbine while flowing through the pressure ratio mixer. The foam liquid pump is started to inject the foam liquid stored in the atmospheric pressure container into the device pipeline. It is proportional to the pressure water. The automatic balance adjustment of the pressure balance valve will automatically mix an appropriate amount of foam with the pressure water into foam mixed liquid. Foam mixed liquid is transported to foam generators, foam guns, foam cannons, or other foam equipment to produce air foam to extinguish liquid fires such as class A, B, and C. The balanced pressure foam proportioning device maintains the pressure balance of the foam concentrate and water entering the ratio mixer, thereby ensuring that the foam concentrate and water are mixed in the prescribed ratio. The device is composed of a foam pump, pressure control valve, balanced pressure ratio mixer, relevant control valves, pressure gauges, and connection foam generating pipelines. The above equipment is installed on a steel base in the form of a modular block.

II. Working process of the balanced pressure foam proportioning device:

The balanced pressure foam proportioning device works as follows: The foam pump sucks in foam liquid from the atmospheric pressure foam liquid storage tank and pressurizes it to the foam concentrate dry pipe. The mixed liquid is realized by connecting the balanced pressure ratio mixer, and the foam is connected to the foam concentrate The pressure and water pressure in the tube are balanced by the balance control valve located on the foam liquid concentration reflux pipe, and the dual needle pressure gauge always displays the pressure of the foam concentrate and water.

PHP is an independent system that is automatically adjusted by water flow and pressure. The system is generally installed near the foam tank and is connected to the foam tank, fire pressure water, and foam generating equipment through pipelines. When a fire occurs, the foam pump starts, and the foam in the connected storage tank is injected into the proportioning device pipeline. After being adjusted by the balance valve and proportioning mixer, a certain proportion of foam is injected into the water flowing through the proportioning mixer, and mixed into foam solution, which is then output to foam equipment such as foam generators, foam guns, etc., to produce air foam to extinguish fires.