Abstract: The invention is directed to a configuration for compressing a gas comprising (i) a reciprocating compressor (8), wherein the compressor comprises a mechanical drive to transfer energy from a variable rotational power source (1) to the compressor and a control valve (34, 35) and an adjustable swash plate (30), wherein adjusting the control valve results in adjusting the swash plate; (ii) a speed sensor (7) to measure the rotational speed of the power source; (iii) a first control means which control means is capable of adjusting the control valve as a function of the rotational speed measured by the speed sensor.