Final answer:
The Emergency Shutoff Valve or shear valve is a vital safety device installed at the base of the fuel dispenser to automatically shut off fuel flow in case of an accident, minimizing risks of spills and fires.
Step-by-step explanation:
The Emergency Shutoff Valve or shear valve is a safety device installed in fuel-dispensing systems. Its primary purpose is to prevent the release of fuel in the event of an accident that could damage the dispenser or associated piping. The shear valve is typically installed at the base of the fuel dispenser, with some designs requiring placement on both sides of the dispenser.
In the case of an impact or a significant change in force, the valve is designed to close automatically and stop the flow of fuel. This function minimizes the risk of fuel spillage, which can lead to fires, environmental damage, and other hazardous conditions. It is a critical component for safety at gas stations and other fuel dispensing locations.