What is the maximum number of pressure/vacuum (P/V) valves that can be used with a Phil-Tite EVR Phase I system?

The correct answer regarding the maximum number of pressure/vacuum (P/V) valves that can be used with a Phil-Tite EVR Phase I system is that three P/V valves are allowed. This specification ensures that there is an adequate balance of pressure and vacuum within the system, which is essential for the proper functioning of vapor recovery during fuel transactions.

The inclusion of multiple P/V valves allows for enhanced control over vapor emissions by maintaining optimal pressure levels while preventing excessive vacuum conditions during the filling of tanks. By utilizing three valves, the system can manage varying conditions better, optimizing performance and complying with regulatory standards.

While fewer valves could still provide some level of pressure and vacuum relief, they may not adequately respond to all operational scenarios, potentially leading to either insufficient pressure release or excessive vacuum, both of which can compromise the effectiveness of the vapor recovery system. Taking into account system design, efficiency, and regulatory compliance, having three P/V valves strikes the right balance for a Phil-Tite EVR Phase I system.