The 6-9KG Brass Dry Powder Fire Extinguisher Valve uses industry-standard thread specifications (outlet thread M14×1.25, nozzle connection M16×1.5), ensuring high compatibility with the market’s mainstream 6kg and 9kg pressurized dry powder fire extinguisher cylinders, facilitating assembly of the complete unit and seamless replacement in the future.
Both the valve core and seals feature a design that allows for easy disassembly and reassembly. This ensures simple and efficient operation during annual inspections, maintenance, or dry powder refills, significantly reducing labor hours and labor costs for fire safety maintenance providers.
Our 6-9KG Brass Dry Powder Fire Extinguisher Valve have been exported in bulk for many years to dozens of countries and regions across Europe, the Middle East, Southeast Asia, and South America, earning the long-standing trust of fire safety manufacturers and brands worldwide.
With mature automated production lines and a stable supply chain, we offer direct factory delivery (supporting various delivery terms such as FOB, CIF, and EXW), eliminating middlemen, ensuring price transparency, and maintaining controllable lead times.
We provide comprehensive after-sales support and technical assistance, and offer OEM/ODM customization services.
| Material | Copper |
| Surface treatment | According to customer requirements (chrome/nickel plated) |
| Inlet thread | |
| Outlet thread | M14*1.25 |
| Gauge thread | M15*1.25 |
| Dip tube pipe thread | M16*1.5 |
The inlet thread field is left open in the parameter table, and that is deliberate. The inlet is the interface to the cylinder neck, and the correct thread is determined by the cylinder the valve is fitted to, not by the valve family alone. A 6 kg or 9 kg dry powder cylinder from one manufacturer may use a different neck thread from the same nominal capacity supplied by another, and selecting a valve by capacity alone is a common source of assembly problems.
Published cylinder interface data for 6–9 kg dry powder extinguishers commonly lists PZ27.8 and M30×1.5 among the neck threads in use, alongside other regional forms. The inlet for a given order should be confirmed from the cylinder drawing, including thread tolerance and engagement length, before the valve is specified. Where the buyer supplies the cylinder, that drawing should accompany the enquiry. Where the valve and cylinder are specified together, the inlet thread is one of the first parameters to fix.
The outlet, gauge and dip tube connections on this valve are all metric fine threads. M14×1.25, M15×1.25 and M16×1.5 are parallel threads and do not seal on the thread flanks. Pressure tightness is achieved at a sealing face, a gasket, or a bonded washer at the joint, and the condition of that face belongs to the same assembly check as the thread match.
The M14×1.25 outlet connects the discharge hose or nozzle assembly. The M15×1.25 gauge thread is a larger gauge connection than the M10×1 or M10×1.5 seen on compact valves, which reflects the size of the gauge and the pressure range used on 6–9 kg units. The M16×1.5 dip tube connection feeds the internal tube. Each of these is a distinct interface, and the assembly drawing should identify them separately so that the outlet, the gauge and the dip tube are not crossed during assembly. Applying a thread sealant alone to a parallel thread, or omitting the face washer at the outlet, produces a joint that may appear tight but does not hold under pressure cycling.
Dry powder places a specific demand on valve seals. The agent is a finely divided solid carried in a pressurised gas head space, and the seal must resist abrasive erosion while maintaining gas-tightness over long storage. Powder that migrates into a sealing interface can score the seat or hold the seal marginally open, producing a slow propellant loss that is not visible externally.
The easy-disassembly design described for the valve core and seals is relevant in this context. Annual inspection and dry powder refill require the valve to be opened, the seals checked, and the internal passage cleared of caked powder before reassembly. A valve that can be disassembled without damaging the body or the threaded connections reduces the risk of a maintenance error, and it allows the seal and seat to be inspected directly rather than judged from the outside. NBR is a common base elastomer for dry powder valve seats because of its mechanical properties and its compatibility with the oil- and fat-containing fractions in some powder formulations; where the valve is opened for service, the seal should be assessed for hardening, cracking or embedded powder before it is refitted. The seal compound and any secondary PTFE stem seal should be confirmed against the powder formulation the extinguisher carries, rather than assumed from a general dry powder classification.
Forged from premium brass, the valve body exhibits superior tensile strength and corrosion resistance. Built to withstand continuous internal pressures without micro-fissures or material degradation, it ensures continuous seal integrity in demanding industrial, marine, and outdoor environments.
During critical fire incidents, ease of operation is essential. The Brass valve 6-9KG Dry Powder Valve features an ergonomically structured steel operating handle and squeeze lever. Designed for intuitive operation, it allows both professional responders and untrained personnel to actuate the valve swiftly under high-stress conditions.
Engineered to international fire safety hardware standards, the Brass valve 6-9KG Dry Powder Valve utilizes industry-standard thread specifications:
outlet thread: M14×1.25 thread for real-time pressure monitoring equipment.
The 6KG and 9KG extinguisher formats are commonly used where a larger extinguishing-agent capacity is required than compact 1KG or 2KG portable units.
The 4-12KG valve with Red Handle is designed around this capacity range and provides the valve connections required for integration with compatible pressurized dry powder extinguisher cylinders.
When selecting a valve for an existing extinguisher, capacity alone should not be used as the compatibility criterion.
The valve body is manufactured from brass, a commonly used material for valve components requiring mechanical strength, machinability and resistance to normal environmental exposure.
Brass also provides a suitable substrate for machining threaded connections and functional valve interfaces.
The FAQ below notes that safety pressure relief structures are incorporated to prevent overpressure explosion risks. The relief setting is not a fixed property of the valve alone; it is established against the cylinder the valve protects. Published data for 6–9 kg stored-pressure dry powder extinguishers commonly lists a working pressure around 14 bar and a cylinder pressure test (PT) of 27 bar, with the safety device intended to vent below that test value.
Before selecting this valve for a specific cylinder, the relief setting and the cylinder’s stamped PT should be read together. What matters is that the safety device opens before the cylinder is exposed to a pressure approaching its test value. A cylinder tested at a different value requires its own check; the relief setting should not be transferred without confirming that the relationship still holds. The cylinder drawing and the finished extinguisher’s pressure specification are the controlling references.
A1: Our valves are designed and manufactured in strict compliance with international standards:
Valve bodies and stems are forged from HPb59-1 lead brass bar stock, conforming to Chinese GB/T 5231 and GB/T 4423 standards.
Safety pressure relief structures are incorporated to prevent overpressure explosion risks.
Thread specifications for cylinder connections strictly follow internationally accepted standards (such as PZ27.8, M30×1.5, etc.), ensuring compatibility with mainstream fire extinguisher cylinders.
Seals are made of NBR (nitrile rubber) for long-term sealing performance.
Our products have obtained EN, CE and ISO certifications, ensuring safe export to European and global markets.
A2: Not exactly. Fire extinguisher valves are our core products, but our business scope goes far beyond that.
As a National High-Tech Enterprise, we are committed to providing comprehensive fire valve solutions to our customers. Our product line includes:
Full Range of Fire Extinguisher Valves: Covering all kinds of extinguishers, including specialized valves for dry powder, water-based, CO₂, and other extinguishing agents.
Marine Cylinder Valves: Specially designed for shipboard fire protection systems, meeting the demanding requirements of marine environments.
Gas Valves: Specialized valves for gas transmission and pipeline systems.
Customized Valve Solutions: We can develop and customize valves with specific specifications, materials, and functions according to customer requirements.
In addition, we also supply complementary fire protection accessories and hardware products, offering our customers a one-stop purchasing experience.
With 41 patented technologies and over 25 years of industry experience, we are well-equipped to handle various custom requirements for fire valves. If you have specific product needs, please contact us—we will provide professional solutions tailored to you.
A3: Yes, we provide comprehensive ODM and OEM services.
As a National High-Tech Enterprise, we have a professional R&D team and technical service team capable of delivering full-process customized services from design to production. Our customization services include:
OEM Services: Based on customer-provided drawings, specifications, or samples, we strictly follow your requirements for production and processing, ensuring that the products fully meet your technical parameters and quality standards.
ODM Services: If you have new product concepts or functional requirements, our R&D team can participate in product design, provide innovative solutions, and complete the entire process from development to mass production.
Valve material customization (brass, aluminum alloy, stainless steel, etc.)
Thread specification customization (adapting to different fire extinguisher cylinder interfaces)
Surface treatment customization (chrome plating, nickel plating, electrophoretic coating, etc.)
Product specification adaptation (for all kinds of fire extinguishers)
All customized products are backed by our strict quality management system and comply with international certification standards including EU EN, CE, and ISO. With our independent R&D capabilities and 41 patented technologies, we have the expertise to transform your product concepts into mature solutions that meet international standards.
For more information about our OEM/ODM services, please contact us—we will provide professional customized solutions based on your specific needs.
A4: The inlet is specified against the cylinder neck. 6–9 kg dry powder cylinders from different manufacturers may use different neck threads, with PZ27.8 and M30×1.5 among those commonly in use. The inlet thread and engagement length should be confirmed from the cylinder drawing before the valve is ordered, rather than inferred from the capacity range.
A5: M15×1.25 is a larger gauge thread than the M10×1 or M10×1.5 used on compact valves. The pressure gauge specified for the finished extinguisher must match this thread and its sealing form. A gauge intended for an M10 port will not fit an M15×1.25 port, and the two should not be adapted with a bushing in a way that changes the pressure boundary.
A6: The relief setting is established against the cylinder’s stamped test pressure. For 6–9 kg stored-pressure powder extinguishers, published data commonly lists a working pressure around 14 bar and a PT of 27 bar, with the safety device intended to vent below that value. A cylinder tested at a different value requires its own check; the relief setting should not be transferred without confirming that the relationship holds.
A7: Dry powder service requires the valve to be opened at annual inspection and at refill, so the seals can be checked and the internal passage cleared of caked powder. A core and seal design that can be disassembled without damaging the body or the threaded connections reduces the risk of a maintenance error and allows the seat and seal to be inspected directly. The seal should be assessed for hardening, cracking or embedded powder before it is refitted.
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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