In the next section, we'll look at the major types of extinguishers. The proper way to use the extinguisher is to aim it directly at the fuel, rather than the flames themselves, and move the stream with a sweeping motion. This drives the material up the siphon and out the nozzle with considerable force. The compressed gas escapes, applying downward pressure on the fire-suppressant material. The operating lever pushes down on an actuating rod (the blue piece). The metal safety pin prevents the operating lever from closing accidentally. The bottom of the actuating rod has a sharp point, which pierces the gas cylinder release valve.
The lever pushes on an actuating rod, which presses the spring-mounted valve down to open up the passage to the nozzle. To use the extinguisher, you pull out the safety pin and depress the operating lever. A release valve keeps the compressed gas from escaping. At the top of the cylinder, there is a smaller cylinder filled with a compressed gas - liquid carbon dioxide, for example. A spring-mounted valve blocks the passageway from the siphon to the nozzle. In this extinguisher, a plastic siphon tube leads from the bottom of the fire-suppressant reservoir to the top of the extinguisher. Here's the sequence of events in a typical wood fire: For the combustion reaction to take place, the fuel has to be heated to its ignition temperature. Of course, wood and gasoline don't spontaneously catch on fire just because they're surrounded by oxygen. Fire is the result of a chemical combustion reaction, typically a reaction between oxygen in the atmosphere and some sort of fuel (wood or gasoline, for example). For the combustion reaction to take place, the fuel has to be heated to its ignition temperature.
We'll also find out what causes fire in the first place, learn the correct way to use an extinguisher and see what sort of fire suppressant works best on different types of fires. In this article, we'll see exactly what fire extinguishers do and how they do it.
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