What is the maximum size for ball valves used in refrigerant piping?

The correct maximum size for ball valves used in refrigerant piping is indeed 2 7/8 inches. This size is standard because it aligns with industry practices for refrigerant systems, which prioritize efficiency, consistent flow rates, and compatibility with typical piping dimensions used in HVAC/R systems.

Larger valves, such as those measuring 4 inches or 5 inches, may not be suitable for refrigerant applications due to the risk of improper flow rates, potential leak issues, and mechanical challenges when integrating them into systems designed for smaller size fittings. Additionally, valves that exceed the industry standard may not meet the requirements for pressure ratings and regulatory compliance, which are critical in maintaining system integrity and safety.

Using a 2 7/8 inch valve allows for optimized flow control while ensuring that the system can handle refrigerant effectively without compromising on performance or safety.