PDC Machines, LCC is the world's leading manufacturer of diaphragm compressors and hydrogen refueling stations. PDC has been manufacturing diaphragm compressors since 1977 for use in the specialty gas, oil & gas, chemical, petrochemical, research and renewable energy industries. PDC diaphragm compressors are the first choice when contamination-free, leak-tight gas compression, high & ultrahigh pressure compression is required. Our compressors can handle industrial, hazardous, explosive, rare, pyrophoric, toxic and corrosive gases and gas mixtures. Unparalleled excellence in Hydrogen Energy! There are over 1000 compressors currently in use for hydrogen refueling of vehicles, buses, material handling equipment and experimental aircraft.