The ANKE CO2 valve is a lever-operated cylinder head valve designed for 2–5 kg CO2 fire extinguishers. It serves as the primary control component that retains pressurized CO2 inside the cylinder and releases the extinguishing agent when actuated manually.
The valve body is machined from high-quality brass (HPb59-1 or equivalent) through a series of production processes including forging, grinding, polishing, and electroplating. This manufacturing route ensures structural integrity, dimensional consistency, and resistance to the mechanical stress and thermal cycling inherent to CO2 fire extinguisher operation.
The CO2 Valve for 2-5KG CO2 fire extinguisher is equipped with a burst disc safety device set at 200 ± 15 bar, which functions as a pressure relief mechanism to prevent cylinder over-pressurization. The inlet thread is PZ27.8, compatible with standard CO2 fire extinguisher cylinder necks. The outlet thread is W21.8-14, and the dip tube connection uses M10×1 thread.
Surface finish options include chrome plating and nickel plating, both applied to enhance corrosion resistance and heat resistance. The operating lever’s color and style can be customized to meet specific customer or market requirements. This valve is sold primarily to the European market and other international markets where EN 3 compliance is required.
| Parameter | Specification |
| Valve Type | Lever-operated CO2 cylinder head valve |
| Body Material | High-quality brass |
| Surface Finish | Chrome-plated or nickel-plated (per customer requirement) |
| Inlet Thread | PZ27.8 |
| Outlet Thread | W21.8-14 |
| Dip Tube Thread | M10×1 |
| Safety Device | Burst disc, 200 ± 15 bar |
| Applicable Cylinder | 2–5 kg CO2 fire extinguisher (approx. 2–5 L) |
| Valve Weight | 484 g |
| Operating Temperature | –30°C to +60°C (typical for CO2 extinguishers conforming to EN 3-7) |
| Customization | Handle color/style, plating type, thread configuration, and other parameters available upon request |
Note: Working pressure of CO2 fire extinguisher valves conforming to EN 3-7 is typically in the range of 174–250 bar depending on cylinder design and test conditions. The safety device setting of 200 ± 15 bar is calibrated to release before cylinder rupture while remaining above normal operating pressure. If you require a specific working pressure or safety device setting for your application, please provide your cylinder specification for matching.
Source reference: EN 3-7 specifies operating temperature range of –30°C to +60°C and pressure test at 250 bar with maximum permitted pressure of 174 bar for 2–5 kg CO2 extinguishers.
Manufacturing & Quality Control
The CO2 Valve for 2-5KG CO2 fire extinguisher body is produced from high-quality brass with controlled alloy composition to ensure consistent machining behavior, pressure containment capability, and long-term corrosion resistance. Brass is selected for its combination of machinability, sealing performance, and cost efficiency compared with stainless steel for this application.
Forging of the valve body blank
CNC precision machining of threads, sealing surfaces, and internal passages
Grinding and polishing for surface finish
Electroplating (chrome or nickel) for corrosion and heat resistance
Assembly and functional testing of the safety device
Each production batch undergoes dimensional inspection and functional testing. The burst disc safety device is tested to confirm activation pressure within the 200 ± 15 bar range. Leak testing is performed to verify sealing integrity at the valve–cylinder interface and at the outlet connection.
The factory has introduced automated valve assembly equipment, which improves consistency in assembly torque and reduces variability in safety device seating and lever mechanism function.
| Certification | Scope |
| CE | Compliant with applicable EU directives for fire extinguishing equipment |
| TÜV | Third-party testing and certification of valve performance |
| ISO 9001 | Quality management system certification covering design, production, and inspection |
The valve is designed for use on CO2 fire extinguishers intended for the European market, where EN 3-7 compliance is a market requirement. The 200 ± 15 bar burst disc setting aligns with pressure relief requirements for CO2 extinguisher cylinders in this capacity range.
This valve is suitable for 2–5 kg CO2 fire extinguishers used in the following environments:
Electrical equipment areas: Server rooms, data centers, switchgear cabinets, and substations, where CO2 is preferred because it leaves no residue after discharge
Industrial settings: Laboratories, precision instrument rooms, and coating production lines where clean agent extinguishing is required
Marine applications: Engine rooms and fuel storage areas on vessels where CO2 systems are commonly specified
Commercial kitchens: CO2 extinguishers for Class B (flammable liquid) fires and live electrical equipment fires
The valve is compatible with standard CO2 fire extinguisher cylinder necks using PZ27.8 inlet thread and is typically fitted with a dip tube for liquid CO2 discharge.
Installation & Maintenance Notes
The CO2 Valve for 2-5KG CO2 fire extinguisher is installed by screwing into the cylinder neck using the PZ27.8 thread. Thread sealing should be achieved with an appropriate sealant or O-ring, depending on the cylinder design. The dip tube is connected via the M10×1 thread and tightened to the cylinder manufacturer’s recommended torque. The outlet connection (W21.8-14) is used for the discharge hose or horn assembly.
CO2 fire extinguisher valves should be inspected periodically as part of the extinguisher’s routine maintenance schedule. Key checks include:
● Visual inspection of the valve body for corrosion or mechanical damage
● Verification that the safety device (burst disc) is intact and unobstructed
● Functional check of the lever mechanism to confirm smooth operation
● Leak check at the cylinder–valve interface
The burst disc should be replaced if it has been activated or if there are signs of corrosion or deformation. Annual maintenance by a qualified service technician is recommended to ensure continued compliance with local fire safety regulations.
A1: The valve is designed for 2–5 kg CO2 fire extinguishers (approximately 2–5 L cylinder volume). The valve assembly weighs 484 g.
A2: The standard MOQ is 500 pieces. If the valve is ordered together with other fire extinguisher accessories, the MOQ may be negotiable depending on the combination and total order value.
A3: The valve holds CE, TÜV, and ISO 9001 certifications. The burst disc safety device is set at 200 ± 15 bar, consistent with pressure relief requirements for CO2 extinguishers in this capacity range.
A4: As a manufacturer of fire extinguisher valves, ANKE offers both ODM and OEM services. Customizable parameters include:
● Surface finish: chrome or nickel plating
● Handle color and style
● Thread configuration (within specified ranges)
● Safety device setting (within applicable standards)
● Dip tube length and connection
Samples can be provided for evaluation. Technical drawings or existing samples from customers are acceptable for custom development.
A5: Quotations are provided on EXW or FOB basis. For initial orders, production begins upon receipt of a 30% deposit, with the remaining 70% balance due before shipment. For established long-term partnerships, extended payment terms and volume-based discounts are available.
Address
Factory: Huilong Village, Huangjiabu Town, Yuyao City, Zhejiang Province, China
Branch Office: Hengye Building 509, No.158 Tai'an Middle Road, Yinzhou District, Ningbo, Zhejiang, China
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