The Type segmentation of the Oil-Injected Compressors market distinguishes three primary architectures: reciprocating, rotary screw, and centrifugal units. Reciprocating compressors dominate the low‑to‑mid pressure range, accounting for roughly 45% of total sales due to their robustness in intermittent duty cycles and ease of maintenance. Rotary‑screw models, representing about 35% of the market, are favored for continuous‑flow operations because of higher volumetric efficiency and reduced pulsation, which translates into lower downstream vibration. Centrifugal compressors, though comprising only 20% of shipments, capture the high‑capacity segment where large airflow volumes and high pressure ratios are required, such as in integrated petrochemical complexes. Each subtype contributes distinct cost structures, performance envelopes, and lifecycle considerations, collectively shaping the overall market size and influencing OEM investment strategies across industrial sectors.