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Diaphragm Gas Compressors


Diaphragm Gas Compressors

Metallic diaphragm compressors are ideal for compressing:

  • Rare

  • Ordinary

  • Toxic

  • Flammable

  • Pure

  • Oxidizing

  • Radioactive

  • Explosive gases

Without incurring any contamination or leakage of the process media that results from most other types compressor designs.

How it works

A triple set of diagrams isolate the process media from the main piston and related hydraulic components.

Applications include:

  • Filling & off-loading gases from tube trailers, cylinder filling and high-pressure gas storage systems

  • Hydrogen fuel cell stations (vehicles, buses, mateiral handling)

  • Pressure boosting & storage of gases from on-site gas generation systems

  • Gas blending, mixing and re-cycling

  • Feed-stock gases for chemical, petrochemical & pharmaceutical industries

  • Gas generation & recycling systems

  • Power plant turbine cooling


  • Inlet pressures from atmospheric to 400 barg

  • Output pressures to over 60,000 psi (4,100 bar)

  • Gas flow rates from 1 nm3/hr to 2000 nm3/hr based on application

  • Units ranging from 0,55 to 150 kw units

  • Fully integrated process and control system per the specific design requirements of the individual customer. Control system can be plc or dcs based

  • Common skid mounted solution including customer purchased or supplied equipment

  • Custom enclosures to conform to local codes and site needs

  • Startup and commissioning for the unit supplied


Where a reciprocating compressor requires 2 stages, a pdc diaphragm compressor can typical do the job in 1 stage.
This reduces capital and maintenance cost.

  • Completely contamination free compression: No downstream gas clean up is required

  • Where Reciprocating compressor frequently require 4-5 stages of compression, a PDC diaphragm compressor requires only 1 or 2 (based on the application

  • This results in lower maintenance costs, less spare parts requirements and lower overall operating costs

  • Maintenance time is SIGNIFICANTLY reduced. Where a reciprocating compressor can take 2-3 days to turn around, a PDC diaphragm compressor only takes between 2-4 hours max

  • Because of our unique horizontally opposed crankcase design PDC Diaphragm compressors are more energy efficient than recip’s

Why diaphragm high pressure compressors

High compression ratio

Process gas compressors 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.

Environmentally safe

Because PDC Machines’ diaphragm compressors utilize static seals, our crankcases do not need to be purged or vented. Due to this there is no leakage to the atmosphere.

High suction pressure

Our design permits startup under high inlet pressure without unloading the system as required by other gas compressor systems. Complicated and expensive transition assemblies used by conventional diaphragm compressors are eliminated. Resulting in lower purchase, operating and maintenance cost.

High product purity

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 Machines 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 gas. The process side of these units is constructed of compatible corrosion-resistant material (stainless steel, Inconel®, Hastelloy®, Monel®, etc.) to prevent contamination.

A comparison of compressor

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