What is the main purpose of an OPD valve?

The main purpose of an OPD valve, or Overfill Prevention Device, is to cut off the filling process when the fill level of the container is achieved. This essential safety feature is primarily used in tanks containing liquid propane to prevent overfilling, which can lead to dangerous situations such as spills or explosions. By automatically halting the flow of propane once the tank reaches a designated fill level, the OPD valve helps to ensure that the tank is filled safely and prevents the risks associated with overfilling.

While maintaining constant pressure, ensuring precise volume measurements, and preventing leaks are all important aspects of tank safety and operation, they are not the specific functions of an OPD valve. The valve's focus is strictly on preventing overfilling during the filling process, which is crucial for safe handling and storage of propane.