A PDC diaphragm compressor pumps gas using a set of flexible membranes that deflect back and forth, driven by a crankshaft and rod mechanism. The process side of the diaphragm is made from a material compatible with the pumped gas, and the oil side from brass to prevent the process and oil sides from galling against each other. In this way, a hermetically sealed system is created, protecting the compressed gas from contamination in the oil system.

Diaphragm cavity contours are computer engineered utilizing Finite Element Analysis to control stress distribution, and diaphragm surfaces are tempered and coated to improve fatigue life. Unlike piston-reciprocating compressors, diaphragm sets do not require oil or air injection to lubricate the piston and seals. This eliminates the need for contaminating the process with hydraulic fluid or purging the compression distance pieces and crankcase with inert gas.

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All PDC Machines diaphragm systems are equipped with a leak detection system that monitors the hermetic sealing of the system, both the process and the hydraulic systems. If any accumulated liquid or debris is detected, the process and hydraulic systems are automatically unloaded and shut down to avoid damage to the heads and head bolts and any associated components.

Aside from their hermetic sealing, PDC diaphragm compressors offer efficient heat dissipation through cooling ports and jackets on the diaphragm head. This significantly reduces the compressed gas discharge temperatures and allows higher compression ratios to be achieved than with piston-reciprocating compressors.