What type of valve must be installed at the discharge end of the transfer hose at vehicle fuel dispensers?

The installation of a quick-acting shutoff valve at the discharge end of the transfer hose at vehicle fuel dispensers is crucial for safety and operational efficiency. This type of valve is designed to respond quickly in emergency situations, allowing for rapid closure to prevent spills and leaks in the event of a malfunction or disconnection.

The quick-acting shutoff valve enhances safety by minimizing the volume of propane that could escape if an unexpected situation arises, such as a hose rupture. Speed of operation is essential in such scenarios, ensuring that the flow of gas can be cut off immediately.

While other valves, such as standard shutoff valves or ball valves, might provide flow control, they may not operate as swiftly, which is a critical factor in managing emergency situations effectively. Therefore, the quick-acting feature is what makes this valve type the correct choice for installation in this context.