Quiet and Compact for a Vacuum Close to the Vapour Pressure

Quiet and Compact for a Vacuum Close to the Vapour Pressure 

Increased noise emission is an indicator of a low degree of efficiency. Also, the generation of vibrations as the source of the sound emission requires an apph-cation of power. Furthermore, the components are unnecessarily stressed by the vibrations. Thus, the sound emission therefore has a direct impact on the operating costs, on the one hand, through an increased power requirement and, on the other hand, through a high service expense. 

A cause of the noise emissions most frequently to be encountered are separation noises via the operation close to the vapour pressure of the ring liquid or with a pressure difference which is too great. Previous experiences in numerous applications have shown that over wide ranges of two-stage LRVPs tend less to separation noises. However, they were replaced in numerous applications for lack of space and for reasons of economy by single-stage closed coupled pumps. 

one can no longer satisfy the changes of the process controls as well as the stricter requirements for emissions with the previously used closed coupled vacuum pumps. Frequently, the space and the necessary financial leeway are lacking 

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