What is the purpose of a pressure/vacuum vent in a vapor recovery system?

The purpose of a pressure/vacuum vent in a vapor recovery system is to maintain pressure within the storage tank and prevent it from collapsing during the vapor recovery process. When fuel is being drawn from the tank, it creates a vacuum, which can lead to structural failure of the tank if not compensated for. The pressure/vacuum vent allows for the safe release of excess pressure as needed and ensures that a proper balance is maintained during both filling and draining operations. This prevents significant pressure differentials that could compromise the integrity of the tank, while also allowing vapors to be managed effectively within the system.

This function is critical in ensuring that the vapor recovery system operates safely and efficiently, reducing the risk of hazardous situations and maintaining compliance with environmental regulations. While other choices may address different components or aspects of fuel systems, they do not focus on the fundamental role of the pressure/vacuum vent in maintaining safe pressure levels within the storage tank during vapor recovery processes.