Choose the right fire extinguisher valve according to its bearing capacity

The choice of valve material directly affects its pressure bearing capacity. Different fire extinguisher types and application scenarios have different requirements for valve materials:
Brass: Brass is a high-strength and corrosion-resistant material, commonly used in valves for portable fire extinguishers, especially in carbon dioxide and dry powder fire extinguishers. Brass valves can withstand high working pressures (usually around 70 bar), and its good machinability makes it easy to manufacture complex valve structures to meet the operating requirements of various fire extinguishers.
Stainless steel: Stainless steel is a higher-strength material suitable for industrial-grade fire extinguishers or stainless steel valves used in high-pressure and harsh environments. Stainless steel has a higher pressure bearing capacity and can withstand working pressures of more than 100 bar. In addition, its corrosion resistance and fatigue resistance are very superior, suitable for long-term use in harsh environments or highly corrosive occasions.
Aluminum alloy: In some lightweight or portable fire extinguishers, valves may use aluminum alloy. Aluminum alloy valves are light in weight and suitable for low-pressure applications (such as household fire extinguishers), but their pressure bearing capacity is relatively low, suitable for fire extinguishers with lower working pressures.
In actual applications, the internal pressure of the fire extinguisher will be affected by changes in ambient temperature. For example, in a high temperature environment, the gas inside the fire extinguisher will expand, causing the pressure to rise. Therefore, sufficient safety margin should be left when designing the valve. The safety margin usually refers to the margin of the valve's pressure bearing capacity relative to the working pressure of the fire extinguisher, and is generally designed to be 20%-30% higher than the normal working pressure.