Pressure adjustment device in stretch blow moulding machines
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United States of America Patent
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Feb 25, 2014
Grant Date -
Jan 5, 2012
app pub date -
Jul 1, 2011
filing date -
Jul 2, 2010
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Abstract
A pressure adjustment device applicable in particular, but not exclusively, to stretch blow molding machines. More particularly, the invention relates to a pressure adjustment device for stretch blow molding machines of containers made of plastic material. The device includes an opening for dispensing a blowing fluid, a hollow body having a first inlet opening for a high pressure fluid and a second inlet opening for a piloting fluid. A shutter is slidably arranged within the hollow body, the shutter being held in a closed position by elastic means, wherein the adjustable opening of the shutter occurs, in contrast with the elastic means, by introducing—through said second inlet opening—the piloting fluid into a piloting chamber arranged between the hollow body the shutter, and wherein the piloting fluid has a controlled and adjustable pressure.
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