Diaphragm piston air compressors move and compress air via a set of three flexible diaphragm membranes. Gas enters the process head via a tank or external process on its down-stroke. In the up-stroke, the diaphragms flex and reduce the area in the chamber, thrusting gas out of the compressor and down the line. The movement of the diaphragms is facilitated by a reciprocating piston and crankshaft mechanism. Only the compressor’s process diaphragm and process head come in contact with the gas, thus preventing hydraulic fluid and oil from coming in contact with the process gas. This is crucial for hydrogen applications that are reliant on the flowing gas remaining pure, and makes diaphragm compressors ideal for applications involving toxic or explosive gases.