Where is the vapor shear valve commonly installed in fuel dispensing systems?

The vapor shear valve is commonly installed at the base of each dispenser. This location is crucial as it is designed to effectively manage the vapor recovery process when fuel is being dispensed. The vapor shear valve plays a key role in preventing vapor release into the atmosphere by allowing vapor generated during the fuel dispensing process to be captured and returned to the storage tank.

Positioning the valve at the base of the dispenser ensures that it is directly integrated into the fueling operation, where the interaction between fuel flow and vapor recovery occurs simultaneously. This helps maintain a balance in the system, allowing for efficient vapor management and compliance with environmental regulations regarding vapor recovery.

Installing the valve at the top of the dispenser or in the fuel line would not provide the same efficiency or effectiveness in managing vapor, as those locations would not be as directly involved in the vapor recovery process during dispensing. Additionally, placing the valve near the storage tank may not adequately address the immediate vapor flow dynamics occurring at the dispenser itself. Therefore, the base of each dispenser is the most effective and strategic location for the vapor shear valve.