Vacuum technology is an indispensable part of metal heat treatment. Vakuum-Harterei Petter (VHP) conducted an evaluation in which an oil lubricated rotary vane vacuum pump was replaced by a Busch COBRA NX screw vacuum pump. The vacuum pump was installed as the forepump of a 3-stage system to supply a heat treatment oven with the objective of finding an efficient alternative to the vacuum generators previously used. After a year of testing VHP is completely convinced by dry screw vacuum technology and in future will invest only in ovens equipped with COBRA NX screw vacuum pumps.
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