Which device is used to control the pressure of propane in a tank?

The device used to control the pressure of propane in a tank is a regulator. A regulator works by reducing the high pressure of propane coming from the tank to a lower, usable pressure suitable for the equipment or appliances using the propane. This ensures that the pressure remains consistent and safe throughout the system, allowing for efficient operation of appliances like heaters or stoves.

The design and function of a regulator are crucial in gas systems. It typically includes a pressure sensor that monitors the gas pressure and mechanisms to adjust and maintain the desired output pressure. This prevents dangers that could arise from high-pressure gas, such as leaks or explosions, ensuring safety in the use of propane-fueled devices.

In contrast, a compressor is used to increase the pressure of gas, not to regulate or control it. A valvometer, while related to measuring pressure, is not a device that directly controls gas pressure like a regulator does. A reducer might suggest a role similar to that of a regulator, but it is not specifically designed for controlling propane pressure in the context described. Hence, the regulator is the correct choice for controlling propane pressure effectively and safely.