What materials must relief valves for all positive pressure supply systems be made of?

Relief valves for all positive pressure supply systems must be made of stainless steel to ensure durability and resistance to corrosion. Stainless steel is chosen because it can withstand the high pressures and temperatures typically found in medical gas systems, while also maintaining its integrity over time. The material is non-reactive, making it ideal for applications where the precision and safety of medical gases are critical. It also performs well under various environmental conditions, preventing leaks that could occur if weaker materials were used.

In contrast, materials like brass and copper can corrode over time, especially when exposed to gases or other environments that may be harsh. Plastic, while lightweight and cost-effective, lacks the necessary strength and pressure tolerance for applications involving positive pressure, making it an unsuitable choice for relief valves in medical gas systems. Thus, the use of stainless steel ensures reliability and safety in the operation of these critical components.