Diaphragm Compressors for leak-tight and contamination-free compression of most gases including Argon, Fluorine, Oxygen, Hydrogen, Nitrogen, Helium, Ethylene, Sour gas, TFE, and many other specialty gases.







PDC's metallic diaphragm compressors are ideal for compressing all types of gases without incurring any contamination of the process gas or leakage into the atmosphere.

PDC Machines has been manufacturing diaphragm compressors since 1977. With decades of experience in diaphragm compressor technology, we have partnered with companies and government agencies worldwide to provide them with the optimum solution to satisfy their gas compression needs. PDC has developed an extensive line of basic diaphragm compressors and fully automated turnkey diaphragm compressor systems with installations located around the globe.

We have been privileged to work with many gas producers, chemical and petrochemical companies around the world. Our clients include 3M, Air Liquide, Air Products and Chemicals, Arizona Public Service, British 


Single-stage fully automated hydrogen compressor meeting Class 1, Division II, Groups B, C, D of the US NEC Code. The control enclosure is purged. Has a closed loop water cooling system mounted on the same skid, auto-start, auto-unloading, pressure gauges, after-cooler, PSV protection.

Oxygen Co., Bristol Myers Squibb, ChevronTexaco, E. I. Dupont, ExxonMobil, Fiba Technologies, Foster Wheeler, Imperial Oil, Korea Specialty Gases, Kyodo Oxygen, Lockheed Martin, Mead Johnson, Nippon  Petronas, Phillips Petroleum, Proton Energy Systems, Plug Power, Praxair, Research Institute of Petroleum Processing, Saudi Arabian Basic Industries, Saudi Electricity Company, Schatz Energy Research, Shell Chemical Company, Stone and Webster, Stuart Energy Systems, SunLine Transit Agency, Teledyne Energy Systems, TRW Systems, The Japan Steel Works, and many, many more.

Two-stage hydrogen compressor fully automated, with auto-unloading system, auto-recycle, inter-stage and after coolers. Meeting NEC Class 1, Division II, Groups B,C,D. Supplied to Arizona Public Service Company.


Metallic Diaphragm Compressors

Compressors and pumps of this type are used in applications ranging from vacuum to pressures up to 60,000 psig (4,100 bar). Because of the large surface areas and masses and the use of water-cooled heads, our metallic diaphragm compressors achieve higher compression ratios than conventional units. In specific cases, compression ratios as high as one hundred to one are possible.


Shown above: Two-stage Tetra-Fluoro ethylene (TFE) gas compressor system manufactured for 3M Company

Electric or Air-Driven Diaphragm Compressors

These compressors are used for contamination-free compression of gases. The process media does not contact the piston, piston rings, etc. that are typically used to generate displacement in conventional compressors. PDC accomplishes this by isolating the process media from the piston and related components with a set of metallic diaphragms. The piston moves a column of hydraulic fluid which in turn moves the diaphragm set and displaces the process media. The process side of these units is constructed of compatible corrosion-resistant material (stainless steel, Inconel, Hastelloy, Monel, etc.) to prevent contamination

Two-Stage Diaphragm Compressors

PDC's two-stage diaphragm compressors incorporate a unique combination of simple design features to provide the best compressor benefits available in the market today. We developed a horizontally-opposed configuration to maximize energy efficiency, reduce manufacturing costs, and increase flexibility. Connecting rod loads offset one another, resulting in lower net horsepower requirements, reduced vibration, and increased crankshaft bearing life. The duplex design permits startup under high inlet pressure without unloading the system as required by other compressor systems. Complicated and expensive transition assemblies used by conventional diaphragm compressors are eliminated. The duplex compressors also provide the unique capability of compressing two independent gases simultaneously.

Shown above: A fully-automated, two-stage compressor system with moisture separator

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