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CO2​ Extinguisher Horn Discharge Assembly

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Introduction: Directing and Expanding High-Velocity Agent

The CO2​ Extinguisher Horn Discharge Assembly is the component responsible for safely conveying and rapidly expanding the high-pressure (≈1800 psi) liquid CO2​ agent into a solid/gaseous snow mixture suitable for fire suppression. It consists of three primary parts: the High-Pressure Hose (or flexible connection), the Plastic or Composite Horn, and the Nozzle/Gasket connecting them.

The horn itself is a crucial element of the assembly, designed with a flaring shape to allow the rapid adiabatic expansion of the CO2​ as it exits the valve. This expansion process drops the agent's temperature to approximately −110∘F (−79∘C), causing it to transform into dry ice "snow" which smothers the fire. The assembly directs the flow, minimizes blowback, and protects the user's hand from the extreme cold.

The horn assembly must be robust to handle the immense discharge force and is mandatory for all 5 lb and larger CO2​ extinguishers. (Approx. 580 words)

Advantage: Maximized Efficiency, User Safety, and Targeted Flow

  • Agent Efficiency: The horn design maximizes the expansion rate of the CO2​, ensuring maximum cooling and gas volume for smothering.
  • Frostbite Protection: The plastic horn material and insulated grip area protect the operator's hands from the extreme cold (−110∘F) of the discharging agent.
  • Targeting Accuracy: The flared shape focuses the jet of CO2​ snow/gas, allowing for precise application onto the fire's base.
  • High Integrity: The assembly components (hose and couplings) are engineered to withstand the explosive force and pressure shock of the CO2​ discharge.
  • Durability: The hose features multiple reinforcement layers (often braided steel or textile) to ensure long-term pressure retention and service life.
  • Code Requirement: The presence of a discharge horn is mandatory for optimal performance and safety on portable CO2​ units.

Specification: Material, Pressure Rating, and Dimension

Component FunctionConveys High-Pressure CO2​, Expands Agent, and Protects User from Cold
Primary MaterialsHigh-Pressure Rubber/Braided Hose, Durable HDPE or Composite Plastic Horn
Working PressureUp to 3000 psi (Hose Burst Rating)
Hose/Valve ConnectionBrass or Steel Swivel Nut and High-Pressure Gasket
Horn FeatureFlared Shape for Rapid Adiabatic Expansion (Joule-Thomson Effect)
Standard ComplianceUL 299/711 (Flow Rate and Integrity), EN 3, NFPA 10
Key Safety FeatureBuilt-in Handle or Grip to Avoid Frostbite Hazard
Horn SizeDependent on Extinguisher Capacity (Larger horns for larger units)

Application and Functional Use

Electrical Equipment Fires (Class C)

The assembly ensures rapid discharge of the non-conductive agent onto energized systems and sensitive electronics.

Flammable Liquid Fires (Class B)

The horn focuses the agent, allowing the smothering cloud of CO2​ to displace oxygen near the fuel source.

Laboratory and Cleanroom Use

Used where a clean, residue-free suppression method is required; the horn ensures accurate targeting.

Marine and Aviation Use

Essential component for ship engine rooms and aircraft systems to maximize the agent's limited discharge time.

Component Inspection

Hoses must be checked routinely for cracks, stiffness, or cuts that could lead to rupture under high pressure.

Grow Your Bussiness With KAITUO

  • INNOVATION

    Professional R&D Team

    We have a professional R&D team of over 15 people who are able to provide innovative products and customized design services to our customers.

  • QUALITY

    Product quality assurance

    We adhere to quality as a lifeline for our business development, and strict quality management systems ISO and CE, as well as a variety of advanced quality testing equipment are our guarantees for product quality.

  • PRODUCTION CAPACITY

    Annual output exceeds 400,000

    Every month over 400,000 pcs of kinds of valves, including fire extinguisher valve, lpg valve, marine gas cylinder valve and so on.

  • SERVICE

    One-stop service

    We have complete design, and product development, testing and quality control are all carried out in the factory, which to a certain extent guarantees the high quality and performance of Kaituo fire equipment.

Payment & Shipping: Flexible Global Trade Solutions

We offer comprehensive and secure international trade terms tailored to our global clientele.

  • Accepted Payment Methods:

    Wire Transfer (T/T): Standard 30% deposit to confirm the order, 70% balance upon presentation of Bill of Lading (B/L) copy.

    Letter of Credit (L/C): Irrevocable L/C at sight for sourcing high-pressure hose and complex injection-molded horn assemblies.

  • Shipping Terms (Incoterms):

    FOB (Free On Board): Ningbo Port is our standard shipping hub.

    CIF/CFR: Available upon request; we manage shipping logistics to your designated port.

  • Packaging:

    Assemblies are typically coiled and secured with the horn protected by a plastic bag, packed in cartons to prevent kinking or cracking.

Comprehensive Information Summary

Minimum Order Quantity (MOQ)10,000 Units (Hose & Horn Assembly)
Lead Time60-75 Days (Hose Fabrication, Injection Molding, Brass/Steel Coupling Machining, Hydrotesting)
PackagingCoiled, Horn Protection, Secure Master Cartons.
CertificationsUL 299/711 (Flow & Pressure), EN 3, ISO 9001.
Raw MaterialsSynthetic Rubber/Braided Hose, HDPE Plastic, Brass/Steel Couplings.
Customization OptionsHose Length/Diameter, Horn Size (Based on CO2​ kg), Coupling Thread Type (NPT/Metric).

Professional Usage Tips

  1. Hose Inspection:

    Routinely flex the rubber hose near the couplings to check for hairline cracks, which indicate dry rot and potential rupture risk.

  2. Grip Only:

    Instruct users to only hold the designated plastic grip or handle on the horn to prevent serious frostbite injury.

  3. Connection Torque:

    When reassembling the valve, ensure the swivel nut connecting the hose to the valve is tightened using the specified torque wrench setting to prevent leakage.

  4. Cleanliness:

    Keep the internal horn passage clear of dust, insects, or debris that could impede discharge flow and reduce efficiency.

  5. Storage Posture:

    Ensure the horn assembly is stored neatly (not kinked or sharply bent) to maintain the hose integrity over the cylinder's life.

Get in Touch

ABOUT KAITUO
Ningbo Kaituo Valve Co., Ltd., also known as Ningbo Anke Fire Equipment Co., Ltd., is China CO2​ Extinguisher Horn Discharge Assembly Manufacturers and Wholesale CO2​ Extinguisher Horn Discharge Assembly Factory, specializing in the research and development, production and export of fire equipment. It owns the anke brand and a number of national high-tech patents.
Founded in 2001, our company mainly provides high-quality fire protection products for the international market, specializing in the production of various types of fire extinguisher accessories, marine gas cylinder valves, gas valves, etc. After years of hard work and continuous improvement of process reform, our products are exported to dozens of countries around the world and have won a good international reputation. All of our products have obtained the EU EN, CE certification in 2007.
Welcome all customers to call and visit us. Our company has a professional sales team to provide accurate services.
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FAQ

The hose allows the user to aim the high-velocity discharge at the base of the fire from a safe distance.

The sudden drop in pressure (expansion) from 1800 psi to atmospheric pressure causes rapid cooling (Joule-Thomson  Effect).

The horn is usually made from durable HDPE or reinforced composite plastic to resist cold shock and provide insulation.

Highly discouraged and unsafe. The discharge would be untargeted, less effective, and pose a severe frostbite risk to the user.

The Minimum Order Quantity (MOQ) for high-pressure CO2​ assemblies is typically 10,000 units.

The hose assembly itself must be hydrotested every 5 years (NFPA 10, often along with the cylinder's 5-year internal inspection).

The discharge time is very fast, usually 8 to 30 seconds, depending on the size of the extinguisher.

The CO2​ agent is highly effective on Class B (liquids) and Class C (electrical) fires.

The insulating properties of the plastic horn and the dedicated grip area minimize thermal transfer.

The swivel nut allows the hose to rotate freely without kinking or stressing the high-pressure connection to the valve body.