Valve
Fire extinguisher head valves come in various types, each designed to ensure the safe and effective release of the fire-fighting agent. The main types of head valves are:
- Standard Valve (or Regular Valve):
- Safety Valve:
- Pressure Relief Valve:
- Turn Valve (or Twist Valve):
- Ball Valve:
- Piston Valve:
This is the most common type used in fire extinguishers. It has a simple design where the pin is pulled to open the valve and allow the agent to be discharged when the handle is squeezed. Typically used for dry powder, foam, and water extinguishers.
A safety valve is designed to prevent over-pressurization of the extinguisher by releasing pressure when it exceeds a specific limit. Common in CO2 extinguishers where there is a risk of pressure buildup.
This valve is primarily used for extinguishers containing compressed gas (such as CO2 or water mist). It automatically releases pressure if it becomes too high to avoid rupture or damage to the extinguisher. Important for extinguishers with high-pressure systems.
A turn valve involves rotating the head to open it. It may be used on some foam extinguishers or in special models where additional safety measures are required. This valve ensures that the agent is only released when the head is fully twisted into the "on" position.
Used mainly in larger, wheeled extinguishers or systems with higher flow requirements. The ball valve uses a metal ball to block or allow the flow of the extinguishing agent when the handle is pulled or squeezed. Common in CO2 or foam extinguishers.
A piston valve uses a piston to seal the discharge port. When activated, the piston moves to allow the fire-fighting agent to flow out. It provides a more controlled release and is used in some specific models.
Each type of valve is chosen based on the type of extinguishing agent, the intended use, and the specific requirements of the fire safety system.