New or replacement shutoff valves for medical gas pressure piping systems shall ______________.

• A. be quarter-turn valves
• B. be brass or bronze construction
• C. have extensions for brazing
• D. all of the above

Answer: (D)

Shutoff valves in medical gas piping are chosen to provide fast, reliable isolation, compatibility with medical gases, and installation flexibility. A quarter-turn design offers a simple, quick, and dependable shutoff with a minimal leak path, which is crucial when rapid isolation is needed for patient safety. Brass or bronze construction is used because these nonferrous alloys resist corrosion in medical gas environments and are compatible with oxygen-rich systems, reducing ignition risk and improving long-term reliability. Extensions for brazing are provided so the valve can be brazed into the piping without exposing delicate components to excessive heat and to ensure a proper, leak-tight joint. When these elements are combined, they address safety, installation practicality, and material compatibility, so all of these features are required.