Which valve is utilized as an overfill valve for the product recovery tank in the Type 3 system?

The 2129AF valve is specifically designed for use as an overfill valve in the product recovery tank within a Type 3 system. This function is critical for preventing overflow of fluids, which can lead to environmental hazards and system inefficiencies. The design of the 2129AF accommodates the necessary pressure controls and prevents liquid from exceeding safe levels during filling operations.

This valve's construction and operational characteristics align with the requirements set for safety and efficiency in maintaining the recovery tank’s function. In contrast, the other valves listed do not have the specifications tailored for overfill prevention in this specific application, which includes considerations such as pressure regulation, fluid dynamics, and system integration.