The type of valve that must be installed in or on the dispenser at the point where the dispenser hose connects to the liquid piping is:

• A. Quick acting
• B. Gate valve
• C. Ball valve
• D. Needle valve

Answer: (A)

In propane dispensing systems, the valve at the point where the dispenser hose connects to the liquid piping is designed to shut off flow rapidly in the event the hose is pulled away or the connection is disturbed. A quick-acting valve is built to close almost immediately, which minimizes the amount of propane that can escape and reduces the risk of a spill or flare. This rapid shutoff capability is essential because it provides an automatic safety response right at the dispenser.

Gate valves and ball valves are good for turning flow on and off, but they do not guarantee a rapid automatic shutoff if the hose is separated or the connection is damaged, and they are not primarily designed for emergency response at the dispenser. Needle valves control flow with fine precision, not for quick emergency closure in a high-volume liquid line. Therefore, the quick-acting valve best meets the safety needs at the dispenser connection.