What are the components of a fire extinguisher?

Update:09 Sep 2021

It is mainly composed of a cylinder, a machine head, a pressure gauge, a valve, a siphon, a gas storage cylinder, a spray system, a bracket (hook), a nozzle (nozzle), etc., usually with a trademark and a factory certificate. If it is a cart-type fire extinguisher, there is an additional travel system. Different types of fire extinguishers have different ingredients: the dry powder fire extinguisher contains dry powder fire extinguishing agent, the foam fire extinguisher contains aluminum sulfate and sodium bicarbonate solution, the carbon dioxide fire extinguisher bottle contains liquid carbon dioxide, and the water fire extinguisher contains clean water.

Detailed explanation of the main components of different fire extinguishers:

1. Dry powder fire extinguisher

Main structure: Dry powder fire extinguishers are divided into portable type and cart type. Portable dry powder fire extinguishers are generally composed of cylinder, cylinder cover, gas storage cylinder, injection system and opening mechanism; cart-type dry powder fire extinguisher is composed of cylinder, cylinder cover, gas storage bottle, traveling system, injection system and opening mechanism. Organization and other composition.

Filling ingredients:

The dry powder fire extinguisher is filled with dry powder fire extinguishing agent. Commonly used dry powder fire extinguishers can be subdivided into BC type and ABC type. The fire extinguishing agent in BC fire extinguisher is mainly sodium bicarbonate and ABC is mainly ammonium phosphate. Of course, because it is a pressure storage type, there is driving gas in it.

2. Foam fire extinguisher

Main structure: cylinder body, cylinder cover, opening mechanism, spray cylinder assembly, siphon tube, safety device and other components.

Filling composition: There are two containers in the foam fire extinguisher, which hold two liquids respectively, they are aluminum sulfate and sodium bicarbonate solution. In the case of a foam fire extinguisher, the fire extinguisher needs to be turned upside down. If the two solutions are mixed together, a large amount of carbon dioxide gas will be produced.

In addition to the two reactants, some foaming agents are added to the fire extinguisher. The foam can be sprayed out smoothly, covering the surface of the burning material and blocking the air. It is most suitable for fighting liquid fires, but not for water-soluble flammable and flammable liquid fires (such as alcohols, esters, ethers, ketones, etc.) and electrical fires.

3. Carbon dioxide fire extinguisher

Main structure: valve, pressure gauge, lead seal, bottle mouth, bottle, siphon, medicament, bracket (hook), nozzle (nozzle) and other components. The barrel of the carbon dioxide fire extinguisher is made of high-quality alloy steel through a special process, and its weight is reduced by 40% compared to carbon steel.

Filling composition: Liquid carbon dioxide is stored in the carbon dioxide fire extinguisher bottle, which mainly relies on suffocation and partial cooling to extinguish the fire.

4. Clean water fire extinguisher

Main structure: safety cap, lifting ring, cylinder and nozzle, etc.

Filling composition: the fire extinguishing agent in the clean water fire extinguisher is clean water. Water has a lower viscosity, higher thermal stability, water-based fire extinguisher, higher density and higher surface tension at room temperature. It is an ancient and widely used natural fire extinguishing agent, easy to obtain and store .