What type of valve is used to shut off propane flow during emergencies?

The manual shut-off valve is specifically designed to halt the flow of propane in emergency situations. This type of valve can be quickly operated by the user to stop the gas supply, which is crucial for preventing leaks or explosions in the event of a system failure or other emergency scenarios. Its simplicity and direct control make it an essential safety feature in propane systems.

While automatic shut-off valves operate without manual intervention, their function is more suited for automatically stopping the flow under specific conditions, such as detecting a leak or a drop in pressure. Pressure relief valves, on the other hand, are designed to relieve excess pressure within a system, protecting it from over-pressurization rather than shutting off the flow entirely. Flow control valves adjust the flow rate of gas but do not fundamentally stop it in emergency situations. Therefore, the manual shut-off valve is the most effective option for immediate action needed in emergencies.