Classification of fine water mist nozzles

Water mist nozzles are commonly used in the fire protection industry today for fire prevention and extinguishing. There are many types. Different types of water mist nozzles can be used in different scenarios. So what are the categories of fine water mist nozzles? Common water mist nozzles include high-pressure water mist nozzles, medium-pressure water mist nozzles, open water mist nozzles, closed water mist nozzles, etc. These are divided according to different methods.

1. Classification by action mode

The fine water mist nozzles are divided according to the action mode: they are divided into open fine water mist nozzles and closed fine water mist nozzles.

The working principles of open water mist nozzles and closed water mist nozzles are different, and the structural designs are also different. The difference between open water mist nozzles and closed water mist nozzles is whether there is a release mechanism composed of a heat-sensitive element. The release mechanism of a closed nozzle is a glass ball, which is a heat-sensitive element containing a certain amount of colored expansion liquid. In addition to the structural differences, what are the other differences between the two:

1. The opening principles are different:

The principle of opening sprinklers is that when the fire alarm system in a certain area detects a fire source, it starts the pump unit and then opens the valve to release water.

The opening principle of the closed sprinkler head is to store low-pressure water in the pipeline for a long time. When the fire temperature in a certain area reaches 57/68°C, the glass beads explode. At this time, the pipeline pressure decreases and the pump unit starts the valve box signal.

2. Use different valves:

The valve part of the system where the open sprinkler head is located is electric or manual. When a fire occurs, the fire alarm system issues an alarm, and the linkage control device starts the valve, or manually starts the valve and opens the valve. The water in the main pipe reaches the sprinkler head through the valve to extinguish the fire.

The valve of a closed sprinkler system is usually closed, but there is water in front and behind the valve. When a fire breaks out, high temperatures can rupture the glass bulb of a closed sprinkler head. When water spurts out, the valve detects a drop in rear water pressure, sending a warning signal to the alarm system. The alarm system is linked to start the fire pump to supply water.

2. Classification according to the principle of production

Fine water mist nozzles are divided according to the generation principle: they are divided into impact type water mist nozzles and centrifugal fine water mist nozzles.

The impact type water mist nozzle sprays the DC water column from the nozzle onto the splash plate, and is broken down into very small water droplets by mechanical force to form water mist. Standard sprinkler heads also rely on impacting the splash plate to achieve water distribution requirements. In comparison, the impact water mist sprinkler head has a diverter cone on the splash plate, which makes the water flow easier to break down into small water droplets. In addition, the spray pressure is increased to achieve the purpose.

The centrifugal water mist nozzle uses multiple high-speed rotating water flows and direct water flows to collide and break up with each other when passing through the small diameter nozzle. These very unstable thin water flows can be broken down into small water droplets without a splash plate, and then sprayed out from the nozzle to form a spray.

Currently, most of the commonly used fine water mist nozzles on the market are centrifugal fine water mist nozzles.

3. Classification by number of openings

Fine water mist nozzles are divided according to the number of openings: they are divided into single-hole fine water mist nozzles and multi-hole fine water mist nozzles.

Fine water mist nozzles are divided into single holes and multiple holes according to the number of holes. Single hole means that only one hole can spray, while multi-hole means that there are multiple nozzle cores on a nozzle shell that can spray.

Commonly used multi-hole fine water mist nozzles include five-hole fine water mist nozzles, six-hole fine water mist nozzles, and seven-hole fine water mist nozzles.

4. Classification by nozzle material

Water mist nozzles are divided according to the material of the nozzle: they are divided into stainless steel water mist nozzles and brass water mist nozzles.

There are many kinds of materials that can be used for water mist nozzles. The most commonly used materials are stainless steel and brass, which are wear-resistant and corrosion-resistant, and can basically meet the application needs of different scenarios.

Why are there water mist nozzles of different materials? It mainly depends on the working environment. Some environments require the nozzle to be corrosion-resistant, and some scenes require the nozzle to be wear-resistant, so you need to choose the appropriate material.

5. Classification according to scope of application

Fine water mist nozzles are divided according to applicability: they are divided into general nozzles and special nozzles.

As the name suggests, universal sprinklers refer to fine water mist sprinklers suitable for most scenarios. They can be installed upright or pendant. They are universal fire sprinklers. Special nozzles refer to nozzles used in special scenarios. Such nozzles can only be used in such environments.

6. Classification by nozzle usage

Fine water mist nozzles are divided according to the purpose of the nozzle: they are divided into special nozzles for fire extinguishing, cooling protection nozzles and water mist blocking nozzles, etc.

This is mainly related to the function of the water mist nozzle. The fire extinguishing mechanism of water mist is mainly surface cooling, suffocation, radiant heat isolation and wetting, so it can exert different effects according to the needs of the scene.

At present, the commonly used water mist nozzles are mainly divided according to the working pressure and action mode, that is, open water mist nozzles, closed water mist nozzles, high-pressure water mist nozzles, medium and low-pressure water mist nozzles, etc., while medium and low-pressure water mist fire extinguishing systems are not commonly used, so there are more high-pressure open water mist nozzles and high-pressure closed water mist nozzles on the market.

More information on water mist nozzles:

What are the models of fine water mist nozzles?

How to clean the fine water mist nozzle

How much does a fine water mist nozzle cost?

What is the pressure of the water mist nozzle?

What is the installation height of water mist nozzles?