What about closed water mist nozzles?

A closed water mist nozzle is composed of a nozzle body, a sealing plunger, a glass ball, a glass ball holder, a nozzle, a nozzle core and a filter. There are two types of closed water mist nozzles on the market: high pressure and medium pressure. Among them, closed high pressure water mist nozzles The working pressure of the nozzle is generally between 5Mpa-14Mpa, while the working pressure of the closed medium-pressure fine water mist nozzle is between 1.5Mpa-3.5Mpa. Of course, if customers have other working pressure requirements, they can also find the manufacturer to customize them.

1. Types of closed water mist nozzles

1. Closed high-pressure water mist nozzle

The working pressure of closed high-pressure water mist nozzles is generally above 3.5Mpa. There are many models. Different models have different working pressures and flow coefficients. Customers can choose according to their own needs. The following is a selection table for closed high-pressure water mist nozzles:

2. Closed medium pressure water mist nozzle

The working pressure of closed medium-pressure fine water mist nozzles is generally between 1.2-3.5Mpa. The application range of this type of nozzles is still relatively narrow. The conventional models include the following. Customers can also customize them according to their own conditions.

2. Principle of closed water mist nozzle

Under quasi-working conditions, the high-pressure water mist fire extinguishing system maintains a certain pressure from the outlet of the pump unit to the pipe network in front of the nozzle. When the temperature of the glass bubble of the closed nozzle reaches the operating temperature, the glass bubble breaks and the pipeline pressure drops. When the pressure is lower than the set starting pressure of the pressure-stabilizing pump, the pressure-stabilizing pump starts to maintain a stable pressure in the system pipe network. When the pressure-stabilizing pump runs for more than a certain period of time and the pipe network pressure is still not reached, the main pump starts and the pressure-stabilizing pump stops. The flow switch feeds back the spray signal of the system. After receiving the feedback signal, the host computer turns on the spray indicator light.

The closed high-pressure water mist fire extinguishing system includes full submergence application and local application. It uses closed water mist nozzles, and is automatically interlocked or remotely controlled by the supporting automatic fire alarm system or manually started to control a group of nozzles to spray water at the same time. Automatic water mist fire extinguishing system.

3. Function of closed water mist nozzle

Closed water mist nozzles can cool fire plumes through fine mist droplets, insulate water vapor from oxygen, and reduce radiant heat to control and extinguish fires. They are usually installed in production sites, warehouses, shopping malls, hotels, hospitals, theaters, office buildings, high-rise buildings, garages and other places with fire risks. Closed water mist nozzles are suitable for extinguishing, suppressing, controlling fire, controlling temperature and reducing dust on the following fires;

Category A: combustible solid fires in bookstores, archives, cultural relics libraries and other places;

Category B: flammable liquid fires in hydraulic stations, oil-immersed power transformer rooms, lubricating oil warehouses, turbine oil warehouses, diesel generator rooms, oil-fired boiler rooms, fuel-fired direct-fired engine rooms, oil switch cabinet rooms and other places.

4. Selection of closed water mist nozzles

For the same water mist nozzle, there are certain differences in the application of closed water mist nozzles and open water mist nozzles. So in which scenarios can closed water mist nozzles be used? In what scenarios can open water mist nozzles be used?

(1) For hydraulic stations, power distribution rooms, cable tunnels, cable mezzanines, electronic information system rooms, cultural relics libraries, as well as libraries, databases and archives stored in dense cabinets, it is advisable to choose an open system with full flooding application;

(2) Open systems with partial application should be used in oil-immersed transformer rooms, turbine rooms, diesel generator rooms, lubricating oil stations and fuel-fired boiler rooms, cooking equipment in kitchens, and their exhaust hoods and exhaust ducts;

(3) For libraries, databases and archives stored in non-dense cabinets, closed systems can be selected.

Closed water mist nozzles have a very good atomization effect, can quickly extinguish, isolate and block the spread of fires, and use pure water as the fire extinguishing medium. They are stored at normal pressure and can be replenished in time. The later use and maintenance costs are low, so they are widely used in the fire protection industry. Lanzhong Electromechanical is a professional manufacturer of fine water mist nozzles. It can design and produce different types of closed water mist nozzles according to different application scenarios to meet different customer needs.

Closed water mist nozzle related information:

Closed high pressure water mist nozzle

Is the water mist nozzle open or closed?

Fine water mist system nozzle

How much does a fine water mist nozzle cost?

Fine water mist nozzle specifications