Compressed air regulator

A compressed air regulator is made for regulating air from compressors and similiar sources. The input pressure is usually a couple of hundred psi at the most, and output pressure can be either predefined or regulated within a certain range. This kind of regulator is relatively cheap, but has a somewhat limited use because of the low input pressure. Compressed air regulators have been used successfully to regulate propane for fuel meters, though they are not made for this and could potentially be damaged. An air regulator may vent to the atmosphere when the pressure dial is being turned down, vented propane may pose a fire hazard. Liquid propane entering the regulator may damage it as well.