This CO₂ fire extinguisher valve is designed for 2–7 kg/L carbon dioxide portable fire extinguishers. The valve body is forged from a single piece of copper rod (single-piece forging), producing a high-pressure–rated component with no welded joints in the pressure boundary. The forged construction provides a structurally robust valve body suited to the working pressures typical of CO₂ extinguisher service.
The 2-7KG CO2 Fire Extinguisher Valve incorporates a squeeze-grip operating handle shaped to conform to the user's palm, reducing hand fatigue during activation. The external surface receives electroplating treatment (chrome or nickel, per customer specification), which serves two purposes: corrosion resistance in humid or marine environments, and wear resistance on the handle and body surfaces over repeated use cycles.
The safety device is rated at 200 ±15 bar, providing over-pressure protection for the CO₂ cylinder. Three threaded connections — inlet, outlet, and dip tube — are standardized to ensure compatibility with common cylinder necks and discharge hose assemblies used in CO₂ extinguisher manufacturing.
Ningbo Kaituo Valve Co., Ltd. (Brand: ANKE) has been manufacturing fire extinguisher valves and accessories since 2001. The factory is located in Huangjiabu Town, Yuyao City, Zhejiang Province — a region that has developed into a concentrated hub for China's fire protection equipment industry. The company operates as a 100% export business, supplying fire extinguisher valves and related components to dozens of countries worldwide.
● Single-piece copper rod forging — no pressure-boundary weld joints
● Safety device: 200 ±15 bar burst pressure
● Inlet: M25×2 | Outlet: W21.8-14 | Dip tube: M10×1
● Surface: chrome-plated or nickel-plated
● Unit weight: 469 g
● Operating temperature range: –30°C to +60°C
| Parameter | Specification |
| Product Name | 2–7KG CO₂ Fire Extinguisher Valve |
| Brand | ANKE |
| Valve Body Material | Forged copper (single-piece copper rod) |
| Surface Treatment | Chrome-plated or nickel-plated (per customer requirement) |
| Inlet Thread | M25×2 |
| Outlet Thread | W21.8-14 |
| Dip Tube Thread | M10×1 |
| Safety Device Set Pressure | 200 ±15 bar |
| Unit Weight | 469 g |
| Suitable Cylinder Capacity | 2–7 kg (≈2–7 L) CO₂ |
| Certifications | CE, TÜV, ISO 9001 |
| MOQ | 500 pcs (negotiable when combined with other accessories) |
| Customization | Threads, surface finish, and branding can be customized per drawing or sample |
The valve body is machined from a single copper rod billet through a hot-forging process, rather than assembled from separately cast or welded components. This eliminates weld seams from the pressure-containing envelope. For CO₂ service at approximately 174 bar working pressure, this construction reduces the number of potential leak paths compared with multi-piece assemblies.
Chrome or nickel electroplating is applied to the exterior surfaces. Beyond appearance, the plating serves as a barrier against atmospheric corrosion — particularly relevant for valves installed on extinguishers stored in coastal, industrial, or outdoor environments. Customers may specify chrome or nickel finish depending on their market requirements.
The squeeze-grip handle is designed around the natural grip position of the hand. The lever geometry provides mechanical advantage for quick valve opening while the spring return ensures the valve closes when released. Handle travel and spring force are calibrated for reliable operation across the service temperature range.
Inlet thread (M25×2) — connects to the cylinder neck. M25×2 is a metric fine thread widely used in CO₂ cylinder applications and conforms to international dimensional standards.
Outlet thread (W21.8-14) — connects to the discharge hose or horn assembly. W21.8-14 is a Whitworth-form thread common in fire extinguisher valve outlets.
Dip tube thread (M10×1) — secures the dip tube that draws CO₂ from the bottom of the cylinder. M10×1 allows interchangeability with dip tubes of different lengths to suit different cylinder heights.
This 2-7KG CO2 Fire Extinguisher Valve is rated for 2–7 kg/L CO₂ extinguishers. Within this range, the valve's safety device (200 ±15 bar) and flow characteristics are matched to the CO₂ charge volume. Using the valve outside this range — smaller than 2 kg or larger than 7 kg — may result in incorrect burst disc sizing or flow performance that does not meet the intended discharge rate.
CO₂ extinguishers equipped with this valve are commonly deployed in:
Commercial kitchens — CO₂ is effective on Class B (flammable liquid) fires involving cooking oils and fats.
Electrical equipment rooms — CO₂ leaves no residue after discharge, making it suitable for server rooms, switchgear cabinets, and laboratories.
Industrial manufacturing — for solvent, paint, and flammable liquid fire risks where dry chemical cleanup would be problematic.
Marine and offshore — the electroplated finish provides corrosion resistance in salt-air environments; CO₂ extinguishers are commonly required on vessels and platforms.
The 2-7KG CO2 Fire Extinguisher Valve is designed for carbon dioxide (CO₂) service. Copper and brass alloys are compatible with dry CO₂ under pressure. The valve should not be used with other media unless material compatibility has been verified for the specific application.
Working pressure: approximately 174 bar (at 20°C)
Safety device activation: 200 ±15 bar
Temperature range: –30°C to +60°C
| Certification | Scope |
| CE | European conformity — product meets applicable EU directives |
| TÜV | Third-party testing and certification |
| ISO 9001 | Quality management system certification |
Ningbo Kaituo Valve operates an in-house quality inspection team with dedicated testing equipment. The manufacturing process includes:
1. Incoming material inspection — copper rod stock is verified for chemical composition and mechanical properties before forging.
2. In-process inspection — dimensional checks on threads, safety device bore, and handle mechanism during assembly.
3. Pressure testing — each valve undergoes pressure testing to verify the safety device and seal integrity.
4. Final inspection before packing — full inspection of thread dimensions, surface finish, and safety device set pressure.
For buyers who require third-party inspection, we can coordinate pre-shipment inspection through nominated agencies.
Beyond the standard specification, we offer OEM and ODM customization:
| Customization Item | Options |
| Surface finish | Chrome-plated / nickel-plated |
| Thread specification | Per customer drawing |
| Branding / marking | Customer logo or required markings |
| Packaging | Per customer requirement |
| Sample-based development | Send us your sample; our technical team will reverse-engineer and propose a matched or improved design |
If a customer provides a sample or technical drawing, our engineering team can analyze the existing design and propose modifications for cost reduction, improved flow characteristics, or material substitution — depending on the application requirements.
MOQ: 500 pcs for standard specification. When ordered together with other fire extinguisher valves or accessories, the MOQ is negotiable.
Lead Time: Depends on order quantity and current production schedule. For standard specifications, typical lead time is provided upon order confirmation.
Samples: Samples can be provided free of charge for evaluation. Freight cost is borne by the buyer.
Packaging: Standard export carton or customized packaging per customer requirement.
Production Updates: Once an order is confirmed, we provide production progress updates and manufacturing process videos so the buyer can monitor the order remotely.
After-Sales: If any issue arises after delivery, our technical team will investigate based on buyer feedback and provide a corrective action or replacement/compensation as appropriate.
This valve is rated for 2–7 kg/L CO₂ extinguishers. The safety device set pressure (200 ±15 bar) and flow characteristics are calibrated for this range. It is not recommended for use outside this capacity range without engineering evaluation.
469 g per valve, excluding the dip tube.
CE, TÜV, and ISO 9001. The manufacturer also holds National High-Tech Enterprise status.
500 pcs for standard specification. The MOQ can be adjusted if ordered together with other products.
Yes. Samples can be provided free of charge; the buyer covers freight cost.
Yes. OEM and ODM services are available. We can modify threads, surface finish, markings, and packaging per customer drawing or sample. Send us your sample or drawing, and our technical team will review and propose a solution.
Approximately 174 bar at 20°C — the typical saturated vapor pressure of CO₂ at room temperature. The safety device activates at 200 ±15 bar.
We operate a dedicated QC team covering incoming material inspection, in-process dimensional checks, pressure testing of the safety device and seals, and final inspection before packing. Third-party pre-shipment inspection can be arranged upon request.
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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