An Explanation of each of the different Parts and Functions of a Fire Extinguisher. Source: https://onlinesafetydepot.com/parts-and-components-of-a-fire-extinguisher/

1. PARTS &
COMPONENTS OF A:
FIRE EXTINGUISHER
OnlineSafetyDepot.com

2. Over View of a Portable Fire
Extinguisher
Portable Fire Extinguisher

3. Purpose of a Fire Extinguisher?
■ The parts and components of a fire extinguisher, all play a vital role in the effective
discharge of water or a chemical agent to suppress a fire before it can spread out
of control leading to property damage and maybe even loss of life.

4. The Fire Triangle
■ Fire extinguishers are engineered to spray and spread an agent on a fire to remove
one of the three elements necessary to maintain a fire once it has started.
Those elements are:
■ 1- Fuel: The source of fuel that is burning
■ 2- Heat: The Heat that is produced by the fire
■ 3- Oxygen: The Oxygen that is needed to keep the fire going

5. Parts and Components
Parts Descriptions of each part or component
Cylindrical Tanks Flat on the bottom and dome shaped on top, cylindrical steel tanks contain the extinguishing
agent and the propellant necessary to provide the pressure to forcibly push the fire
extinguishing agent out creating a spray.
Valve Assembly The function of the valve is to control or regulate the flow of the extinguishing agent. It consists
of a machined body made of metal bar stock on a lathe (or plastic injected molded part for
economy versions), a handle that allows for grasping and lifting and transporting the
extinguisher, a metal locking pin to prevent against accidental discharge, Plastic tamper
seals to keep the locking pin from falling out, a metal release lever and a dip tube through
which the agent is drawn up for expulsion. Stored pressure fire extinguishers may also contain
a pressure gauge.
Nozzle and/or
Hose:
A nozzle directs the direction of the extinguishing agent as it leaves the tank. A hose, typically
found on extinguishers that are heavier than 3 kg, further allows refined directing of the flow as
it leaves the extinguisher.
Extinguishing
Agent
The substance that limits or suppresses the spread of the fire
Propellant A gas whose function is to expel the extinguishing agent from the fire extinguisher.

6. View Image Source HERE.

7. View Image Source HERE.

8. Additional Reading Sources
■ What Kind of Extinguisher Do I Need?
■ The Importance of Fire Extinguisher Tamper Seals
■ Understanding Portable Fire Extinguishers- Use and Limitations
■ Specifications For Wheeled Fire Extinguishers
■ Fire Extinguisher UL Ratings: What It Means
■ Fire Safety – Prevention, Early Warning & Emergency Plan Execution
■ How To Operate A Fire Extinguisher
■ Offshore Fire Extinguisher Placement & Protection