The refrigeration market is characterised by a constant research for high quality compressor. The need of a quick answer to the customer requirement and a low cost solution are therefore the most critical points. The development of a new product line can not always be seen as the right solution; on the contrary, the optimisation of the standard production, if possible, is a great opportunity. In the optimisation of a mature product, the designer has to satisfy different necessities as higher performance, reliability, low costs, low noise and, above all low, impact on the product design. All these aspects are mutually linked. The great influence of the valve system on all the above mentioned items is already known and it is important to remind that a fluidodinamic optimisation of the compressor does not normally imply an increment in the product cost. The PV diagram analysis, the evaluation of the flow losses and the identification of the critical points are therefore the first step of our approach. The definition of the optimised configuration can be achieved by the use of the Design Of Experiment technique. This approach can be seen as the quicker, less expensive and most reliable way to achieve the performance gain. The DOE advantages are also related to the evaluation of the interaction among the various parameters, and therefore to the definition a of "robust design" configuration.
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