The project consists in the supply and commissioning of a compressor unit for Repsol refinery in Tarragona. The main objective of this compressor is the injection of a mixture of hydrocarbures in a PSA separation unit for the gas recuperation. Due to the composition of the hydrocarbure gas, It is fundamental to assure that the temperature of the gas do not decrease in order to avoid condensations. For It, the solenoid cooling water valves are installed in each intercooler which is controlled with the temperature of the gas in each inter stage.