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

The regulator is specifically designed to control the pressure of propane in a tank. Its primary function is to reduce the high pressure of propane coming from the tank to a much lower, usable pressure for safe consumption and operation of appliances. The regulator ensures that the flow of propane remains consistent and stable, regardless of variations in the tank pressure as it is extracted. This is crucial for safety and efficiency because it prevents potential over-pressurization that could lead to equipment malfunctions or emergencies.

Other devices listed serve different purposes; for example, a compressor might increase the pressure of certain gases but is not used for propane pressure control. A valvometer, generally not a standard term in propane systems, would not directly relate to pressure regulation. A reducer can lower pressure but is not synonymous with a regulator, which incorporates additional mechanisms to ensure steady flow and pressure adjustments based on demand.