Oil-free high pressure reciprocating technology 80-518 kW (107-695 HP) World leader in the field of oil-free reciprocating technology and solutions The wide scope of the Gardner Denver High Pressure range means that achieving the optimal oil-free compressor design solution has never been easier. With the choice of single, two or three stages of compression, seven modular crankcases, over 100 cylinder sizes plus a variety of specialist control systems, there is virtually unlimited flexibility in application and performance.