What size of stop valves must be securely mounted independent of tubing or supports when used with soft annealed copper tubing or hard-drawn copper tubing?

The proper size for stop valves that must be securely mounted independent of tubing or supports when used with soft annealed copper tubing or hard-drawn copper tubing is 7/8 inch. This requirement is based on industry standards that dictate how components are to be handled to ensure safety and proper function in mechanical systems.

Using the correct size is essential for maintaining the integrity of the connections and the hydraulic performance of the system. A 7/8 inch stop valve ensures a significant flow capacity while allowing for secure mounting, which is critical in preventing stress on the tubing and connections. This prevents potential leaks or failures that could arise if the valve were improperly supported or mounted.

The specifications in the mechanical code are designed to provide guidelines for safe installations, and the requirement for stop valves to be mounted independently supports the longevity and effectiveness of the plumbing system. By ensuring that the mounting does not rely on tubing, it minimizes the risk of damage that could occur due to vibrations or thermal expansion.