What is the maximum size opening for bypass on excess flow valves?

The maximum size opening for bypass on excess flow valves is specified to ensure that the valves can effectively operate as intended while providing adequate safety measures. The standard drill size opening for this function is 60 drill size, which allows for a balance between flow and control.

Having a bypass of this specific size enables the valve to restrict excessive flow while still allowing enough fluid to pass through under normal operating conditions. This is crucial for preventing scenarios where an excessive release of propane could occur in case of a line break or malfunction. A 60 drill size opening is widely accepted as safe and reliable within industry standards, thus confirming why this specific size is the correct choice.